| 单词 | sedimentary rock |
| 例句 | It’s blessed with golden, sandy beaches formed by the erosion of sedimentary rock, unlike the black seaside expanses found on the other eight islands. The Azores: An untamed island paradise only a few hours by air from North America 2015-12-14T05:00:00Z The “dueling dinos” were discovered seven years ago in the Hell Creek formation, a fossil-rich trove of sedimentary rock underlying parts of Montana, Wyoming and North and South Dakota. Dinosaur Skeletons Headed to Auction, Not Museum 2013-07-29T22:33:04Z Like many incoming college freshmen, I am drawn to the Flatirons — three massive slabs of sedimentary rock that loom from the foothills west of town. An adrenaline-starved adventure traveler looks back at five close calls 2020-06-11T04:00:00Z The scenery would have been enough to draw me to the cordillera, with its upthrust layers of multicolored sedimentary rock set around a crater that’s encircled by rugged river canyons. In the Mountains of Bolivia, Encounters With Magic 2016-03-23T04:00:00Z Then: heat from the interior, metamorphic rock, clouds of steam hiding the sun; clouds, torrential rains, ocean basins filling, rivers, mountains, streams, sand, gravel, clay, sedimentary rock. “Life Story,” Virginia Lee Burton’s Picture Book for the Ages 2015-10-08T04:00:00Z Bighorn Lake is a fisherman’s paradise as well as a watery highway that allows you to float through gorges in the shadow of 1,000-foot walls of sedimentary rock. Summer, Reimagined — Minus the Gridlock. Five Alternatives 2017-06-23T04:00:00Z Igneous, metamorphic, marine sedimentary rocks — in all shapes, sizes and textures, plus a multitude of colors. Four destinations that feel like geologic theme parks 2021-10-14T04:00:00Z Highlights and high points: All of the parks we visited are along the Grand Staircase, which contains various layers of exposed sedimentary rock that stretch from southern Utah to the Grand Canyon. Exploring the natural beauty of southern Utah 2015-10-08T04:00:00Z The composition and scale relate to a viewer's body, while the stacked repetition of forms suggests ancient layers of sedimentary rock. 'Apparitions' at the Hammer explores low-tech art in a high-tech world 2015-02-13T05:00:00Z Its fractured, black and white storm clouds visually coalesce into layers of geological strata, like an X-ray of underground sedimentary rock. A survey of June Wayne at Pasadena Museum of California Art 2014-05-23T04:00:00Z In reality, all limestone landscapes are like that: rain acting on carbon-rich sedimentary rocks sculpts magic worlds underground. The deadly lure of cave paintings 2010-08-11T10:22:00Z We were digging in the midst of the Morrison Formation, a sedimentary rock sequence that’s among the most fertile sources of dinosaur fossils in North America. A real Jurassic park lies underground at the Wyoming Dinosaur Center 2016-11-17T05:00:00Z This link to water is why alien sedimentary rocks are rare. Earth is a geological oddball in our solar system. This is why. 2023-10-12T04:00:00Z Hotspots of CO2 release were concentrated in mountain ranges with high uplift rates that cause sedimentary rocks to be exposed, such as the eastern Himalayas, the Rocky Mountains, and the Andes. Ancient carbon in rocks releases as much carbon dioxide as the world's volcanoes 2023-10-04T04:00:00Z A combustible, sedimentary rock, coal is one of the main sources of energy production around the world. Pros & Cons Of Coal Energy 2018-02-13T05:00:00Z Plant remains in the Chuckanut sedimentary rocks near the fossil trackways reflect the subtropical rainforest ecosystem that covered the coastal region of Washington. 'Spirit Whales and Sloth Tales' tracks Washington fossils and their stories 2023-09-15T04:00:00Z Hail piled up like snow in some spots in the amphitheater, which was carved out of a sedimentary rock formation. Hail pummels concertgoers near Denver, injuring dozens 2023-06-22T04:00:00Z Mars also boasts sedimentary rocks—a dazzling variety of them, left behind from its warmer, wetter past. Earth is a geological oddball in our solar system. This is why. 2023-10-12T04:00:00Z And most shelves are covered by layers of sedimentary rock, which are like hard sponges with small, interconnected, water-filled pores. Found: Giant Freshwater Deposits Hiding under the Sea 2023-06-17T04:00:00Z Photo shows sedimentary rock with a distinct white band in the middle representing the K–Pg boundary. Fundamentals of Biology 2015-01-01T00:00:00Z That includes igneous rock to date the crater and sedimentary rock and clays that may contain biosignatures, perhaps even fossilized evidence of microbial life. NASA’s Perseverance Rover May Already Have Evidence of Ancient Martian Life 2023-04-05T04:00:00Z Still, the Atacama research shows that even a very arid environment will have layers of sedimentary rock with significant amounts of biological remnants, said Chris House, a Pennsylvania State University geologist and astrobiologist. Strange DNA found in the desert offers lessons in the hunt for Mars life 2023-02-21T05:00:00Z The red planet’s sedimentary rocks mostly formed when water helped glue together sediments that accumulated in ancient rivers, lakes, and sand dunes. Earth is a geological oddball in our solar system. This is why. 2023-10-12T04:00:00Z One reason is that hydrogen is scarce in the sedimentary rocks that yield oil and gas, such as organic-rich shales or mudstones. Hidden hydrogen: Earth may hold vast stores of a renewable, carbon-free fuel 2023-02-15T05:00:00Z That’s when the combination of intense pressure and shaking causes sedimentary rock to lose its shape and behave more like a liquid than a solid. What makes an earthquake deadly? These are the things that matter 2023-02-07T05:00:00Z Besides sulfates, life-seeking scientists are particularly eager to grab samples from mudstones—fine-grained sedimentary rocks that the Curiosity rover has seen in Gale Crater but that Perseverance has not yet spotted. NASA’s Perseverance Rover May Already Have Evidence of Ancient Martian Life 2023-04-05T04:00:00Z Galiano The last stop on the interisland ferry is a long, skinny strip of sedimentary rock flanking the eastern boundary of the archipelago. Tacoma author creates an illustrated travelers atlas for PNW islands 2023-02-03T05:00:00Z Still, says Siebach, “because of granite, actually, the sedimentary rocks on Earth that we are most accustomed to are still unique to Earth—across the board.” Earth is a geological oddball in our solar system. This is why. 2023-10-12T04:00:00Z They had assumed that they were going to dig up a bunch of sedimentary rocks. Mars rover digs up intriguing clues in the hunt for life beyond Earth 2022-11-23T05:00:00Z Since July, NASA’s Perseverance rover has drilled and collected four slim cores of sedimentary rock, formed in what was once a lake on Mars. Perseverance Mars Rover Makes ‘Fantastic’ Find in Search for Past Life 2022-09-19T04:00:00Z “This is the place where we have the best chance to explore these ancient sedimentary rocks deposited in the lake.” Life on Mars? This Could Be the Place NASA’s Rover Helps Us Find It. 2022-09-15T04:00:00Z On Earth, a biosignature might be the discarded shell of a clam, the fallen feather of a bird, a fossilized fern embedded in sedimentary rock. The Search for Intelligent Life Is About to Get a Lot More Interesting 2022-09-15T04:00:00Z The skeleton has been found in Upper Jurassic sedimentary rocks, suggesting it is about 150 million years old. Huge dinosaur skeleton unearthed in Portuguese garden 2022-08-26T04:00:00Z If such sedimentary rock was ever there, it’s gone now. Mars rover digs up intriguing clues in the hunt for life beyond Earth 2022-11-23T05:00:00Z Scientists expected the crater floor, once the bottom of a lake, to contain sedimentary rock. Perseverance Mars Rover Makes ‘Fantastic’ Find in Search for Past Life 2022-09-19T04:00:00Z The rover is able to drive up along various exposed layers of the sedimentary rock. Life on Mars? This Could Be the Place NASA’s Rover Helps Us Find It. 2022-09-15T04:00:00Z The footprints occur on a sedimentary rock unit called the Glen Rose Formation, which is mostly limestone, deposited about 105 to 110 million years ago, Mr. Farlow said. The Latest Find as Water Levels Fall: Dinosaur Tracks in Texas 2022-08-24T04:00:00Z The emergence of photosynthetic organisms is recorded in layers of sedimentary rock known as a banded iron formation. Biology for AP Courses 2022-06-09T00:00:00Z Planetary geologists had assumed the floor of the crater was covered in sedimentary rock, formed from dirt and debris that slowly accumulated at the bottom of the lake. Mars rover digs up intriguing clues in the hunt for life beyond Earth 2022-11-23T05:00:00Z In the past few months, the rover has collected two pairs of cores from different types of sedimentary rock that make up the edge of the delta. Perseverance Mars Rover Makes ‘Fantastic’ Find in Search for Past Life 2022-09-19T04:00:00Z However, when the spacecraft landed, it found that the former lakebed had been covered by thin lava flows, blocking the rover from access to the sedimentary rocks it had hoped to find. Astronomy 2016-10-13T00:00:00Z The most recent sample, a sedimentary rock, holds the greatest promise of containing possible evidence of ancient Martian life, said Arizona State University’s Meenakshi Wadhwa, chief scientist for the retrieval effort. NASA to launch 2 more choppers to Mars to help return rocks 2022-07-27T04:00:00Z Justify the claim that these sedimentary rock formations reveal early Earth conditions. Biology for AP Courses 2022-06-09T00:00:00Z The lack of sedimentary rock could mean that the lake didn’t last very long, which would be disappointing for the astrobiologists. Mars rover digs up intriguing clues in the hunt for life beyond Earth 2022-11-23T05:00:00Z As the sediment builds up, pressure increases in the lower layers, forming sedimentary rocks. Miller & Levine Biology 2018-01-01T00:00:00Z Our rovers, exploring ancient lakebeds and places where sedimentary rock has formed, have found evidence for extensive surface water in the past. Astronomy 2016-10-13T00:00:00Z Now, he’s overseeing a program that this summer started to drill a test well in sedimentary rock on the Cornell University campus in New York state. In Utah, researchers are trying to unlock Earth’s heat and make geothermal energy a reality 2022-07-13T04:00:00Z Another source is oil shale, which is sedimentary rock filled with organic matter that can be processed to produce liquid petroleum. Environmental Biology 2018-09-06T00:00:00Z Seismic surveys are the most commonly used tool for early-stage petroleum exploration, as they can reveal important information about the stratigraphy and structural geology of subsurface sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z Detrital sedimentary rocks are composed of mechanically weathered rock particles, like sand and gravel. An Introduction to Geology 2017-01-01T00:00:00Z Later landers were targeted to touch down in areas that apparently were flooded sometime in the past, where sedimentary rock layers, formed in the presence of water, are common. Astronomy 2016-10-13T00:00:00Z Equipment designed for the softer, cooler sedimentary rock often found in oil fields falters in the extremes of hot, hard metamorphic rocks such as granite. In Utah, researchers are trying to unlock Earth’s heat and make geothermal energy a reality 2022-07-13T04:00:00Z Around 20 million years ago, as the Arabian plate drove under the Eurasian, a belt of sedimentary rock lunged, as fast as rock can lunge, into the Miocene air. Building the First Long-Distance Hiking Trail in Kurdistan 2022-04-20T04:00:00Z These are at least partly made up of sedimentary rocks that were deposited along the coasts and then folded, faulted, and uplifted during continental collisions. Physical Geology 2015-01-01T00:00:00Z Quartz is especially abundant in detrital sedimentary rocks because it is very resistant to disintegration by weathering. An Introduction to Geology 2017-01-01T00:00:00Z Future missions will include the return of martian samples selected from sedimentary rocks at sites that once held water and thus perhaps ancient life. Astronomy 2016-10-13T00:00:00Z Marble — whether buffed white or shot through with expressive veins — is synonymous with classical Rome, but the city’s iconic exteriors were made largely of travertine, a porous sedimentary rock that is a form of limestone. Near Japan’s Mount Asama, a Wine Bar Floats Among the Trees 2022-03-23T04:00:00Z They analyzed the projectile point and found it was made of Hozomeen chert, a sedimentary rock specific to the North Cascades. ‘A deep inner meaning’: Seattle returns ancient artifacts to Upper Skagit tribe 2022-03-22T04:00:00Z The Slave Craton is dominated by granitic rocks and metamorphosed clastic sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z This is true for many sedimentary rocks as well. An Introduction to Geology 2017-01-01T00:00:00Z Peering at the walls of a small crater, it detected layered sedimentary rock. Astronomy 2016-10-13T00:00:00Z To resolve the controversy, the researchers pumped a synthetic polymer solution into a simulated “sedimentary rock” built from a box filled with tiny glass beads. Why Some Fluids Flow Slower when Pushed Harder 2022-03-22T04:00:00Z An investigation of sedimentary rock cores revealed that a large, previously undocumented tsunami slammed into Chile’s coast in 1737. Science News Briefs from around the World: March 2022 2022-03-06T05:00:00Z In fact, sedimentary rocks of this age extend all along the western side of the Rocky Mountains, well into Yukon. Physical Geology 2015-01-01T00:00:00Z Chemical sedimentary rocks comes from minerals precipitated out an aqueous solution and is classified according to mineral composition. An Introduction to Geology 2017-01-01T00:00:00Z In these sedimentary rocks were also small spheres that were rich in the mineral hematite, which forms only in watery environments. Astronomy 2016-10-13T00:00:00Z But when flowing through porous materials such as soil or sedimentary rock, certain liquids slow down under pressure. Why Some Fluids Flow Slower when Pushed Harder 2022-03-22T04:00:00Z By definition, this makes the Blackthorn Salt a diagenetic feature, or one that occurs after sediment is turned sedimentary rock. A bizarre Martian rock looks just like coral 2022-03-04T05:00:00Z The Paleozoic strata of the Rockies also include Ordovician, Devonian, Carboniferous, and Permian sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z The chemical sedimentary rock limestone is made of calcium carbonate. An Introduction to Geology 2017-01-01T00:00:00Z That is where scientists expect to find sedimentary rocks that are most likely to contain blockbuster discoveries, maybe even signs of ancient Martian life — if any ancient life ever existed on Mars. On Mars, a NASA Rover and Helicopter’s Year of Surprise and Discovery 2022-02-15T05:00:00Z According to experts, the heavy rain seen in the past few days was compounded by the fact that the region is essentially made up of sedimentary rock. Rock face collapses and strikes tourist boats in Brazil, killing at least 8 2022-01-09T05:00:00Z “As this crumbling sedimentary rock architecture clearly shows, the strength of nature’s water, wind, tides and even the human element in the erosion we’re witnessing are not to be taken lightly.” Landmark arch at San Luis Obispo beach crumbles in December storms 2022-01-05T05:00:00Z Figure 21.10 The Paleozoic sedimentary rocks of southern Manitoba along a section extending from the Saskatchewan border on the left to the Winnipeg area on the right. Physical Geology 2015-01-01T00:00:00Z Cross-cutting igneous rocks and sills can be used to bracket the ages of affected, older sedimentary rocks. An Introduction to Geology 2017-01-01T00:00:00Z London is a city where era is piled upon era, like sedimentary rock. Selling Luxury Apartments Where Oliver Twist Once Asked for Gruel 2021-12-23T05:00:00Z Scholars have identified limestone, igneous and sedimentary rocks. Saint Francis had a vision. Or was it just a dream? These conclusions come from chemical patterns in a group of sedimentary rocks, called the Murray formation, that Curiosity sampled along its path up Mount Sharp. Ancient Martian ‘Lake’ May Have Just Been Ephemeral Puddles 2021-11-15T05:00:00Z Most of British Columbia is made up of terranes that include sedimentary rocks with fossils that imply an origin south of the equator, or volcanic rocks with magnetic orientations that indicate a southern-hemisphere origin. Physical Geology 2015-01-01T00:00:00Z A craton has two main parts: the shield, which is crystalline basement rock near the surface, and the platform made of sedimentary rocks covering the shield. An Introduction to Geology 2017-01-01T00:00:00Z He compared it to a kind of sedimentary rock — layers building upon other layers, each old theory holding up the new ones. How a Viral Video Bent Reality 2021-09-08T04:00:00Z Arvidson said that these soft sedimentary rocks that turn into powder when you drill are "everywhere" on Mars. Mars' weird geology is making Perseverance's job more complicated 2021-08-26T04:00:00Z "Based on rover and helicopter imaging to date, we will likely encounter sedimentary rocks there that we anticipate will align better with our Earth-based test experience," Jandura said. Scientists finally know what happened to Perseverance's mysterious disappearing rock sample 2021-08-20T04:00:00Z Figure 21.16 Tight folds in sedimentary rocks of the Rocky Mountains near Field, B.C. Physical Geology 2015-01-01T00:00:00Z Another factor influencing shear strength are planes of weakness in sedimentary rocks. An Introduction to Geology 2017-01-01T00:00:00Z This happened when the drill bored into structurally flimsy sedimentary rock, though—not anything igneous. Crumbly Mars Rock, Not Hardware Flaws, Scuttled Perseverance's First Sample Attempt 2021-08-12T04:00:00Z They are among the most photographed mountains in Colorado, but the layers of weak sedimentary rock that give them their reddish hue also make them dangerous to climb. Colorado brewer dies after falling while rock climbing 2020-11-10T05:00:00Z This feature allows geologists to date volcanic ash flows that are interspersed with layers of sedimentary rock like a prehistoric layer cake. How Do Scientists Determine the Ages of Human Ancestors, Fossilized Dinosaurs and Other Organisms? 2020-08-04T04:00:00Z During plate convergence, entire sheets of sedimentary rock are slowly pushed over top of other sheets, resulting in situations where older rocks lie on top of younger ones. Physical Geology 2015-01-01T00:00:00Z Trellis patterns typically develop where sedimentary rocks have been folded or tilted and then eroded to varying degrees depending on their strength. An Introduction to Geology 2017-01-01T00:00:00Z Or is it just about adding layers, like Martian sedimentary rock, of evidence that Mars is interesting enough for humans to risk walking there one day? Too Much Mars? Let’s Discuss Other Worlds 2020-07-28T04:00:00Z The team add that the tracks were found in sedimentary rocks thought to be about 170 million years old, which formed from mudflats that once bordered a lagoon. Stegosaurus footprints found on Isle of Skye 2020-03-11T04:00:00Z Any fossils found in the sedimentary rock must be younger than the ash below and older than the ash above. How Do Scientists Determine the Ages of Human Ancestors, Fossilized Dinosaurs and Other Organisms? 2020-08-04T04:00:00Z Figure 21.22 The distribution of Mesozoic sedimentary rocks in the Western Canada Sedimentary Basin. Physical Geology 2015-01-01T00:00:00Z Lithified sediments are considered a sedimentary rock, such as sandstone and shale. An Introduction to Geology 2017-01-01T00:00:00Z King’s sentences are like layers of silt and pebbles condensed into sedimentary rock — distinct from one another but fitted into an indestructible whole. Review: In Lily King’s ‘Writers & Lovers,’ art conquers all 2020-03-01T05:00:00Z It is also home to an estimated 165 million tons of bauxite, a sedimentary rock used to create aluminum products such as aircraft parts, kitchen utensils and beer cans. Mining Ghana’s bauxite would bring in billions from China. But it could also taint the water for 5 million people. 2019-10-25T04:00:00Z The explosion in plastic use in recent decades is so great that microplastics are becoming a permanent part of the Earth's sedimentary rocks. Seeking the 'plastic score' of the food on our plates 2019-10-12T04:00:00Z This started the building of the Rocky Mountains by the thrusting of existing sedimentary rocks toward the east. Physical Geology 2015-01-01T00:00:00Z Mica minerals are usually found in igneous and metamorphic rocks, while clay minerals are more often found in sedimentary rocks. An Introduction to Geology 2017-01-01T00:00:00Z Instead it’s an absorbing abstraction with the layered look of something like a cross-section of earthy sedimentary rock. Review: For the black artists of 'L.A. Blacksmith,' the material of choice is metal 2019-09-27T04:00:00Z The researchers found traces of dust in sedimentary rocks formed at the time containing special helium isotopes and rare minerals that revealed its extraterrestrial origin. Distant asteroid calamity shaped life on Earth 466 million years ago 2019-09-18T04:00:00Z Writing in Science Advances, the team describes how dust and coarse-grained particles from the asteroid’s destruction rained down on Earth and became locked into sedimentary rocks. Dust cloud sparked explosion in primitive life on Earth, say scientists 2019-09-18T04:00:00Z The presence of Nanaimo Group sedimentary rocks far inland and at relatively high elevations on Vancouver Island is attributed to the accretion of the Pacific Rim and Crescent Terranes. Physical Geology 2015-01-01T00:00:00Z The dissolved substances may later precipitate into chemical sedimentary rocks like evaporite and limestone, as well as amorphous silica or chert nodules. An Introduction to Geology 2017-01-01T00:00:00Z Seattle isn't known for its spectacular exposures of lovely sedimentary rocks, either: the most we get is some pale tan or yellowish sandstone bravely pushing up through all the glacial sediments and enthusiastic foliage. What We Can Learn from These Marvelous Out-of-Context Rocks 2019-06-30T04:00:00Z For example, other Chinese bird fossils exhibited flaring tail feathers that had been squished flat inside sedimentary rock. Fossils in Burmese amber offer an exquisite view of dinosaur times—and an ethical minefield 2019-05-23T04:00:00Z The structures in question are embedded in a group of fossil-bearing sedimentary rocks from southeastern Gabon. 2.1-Billion-Year-Old Tracks May Be Giant Ancient "Slime Molds" [Video] 2019-03-23T04:00:00Z Sediments are turned into sedimentary rocks only when they are buried by other sediments to depths in excess of several hundreds of metres. Physical Geology 2015-01-01T00:00:00Z Inorganic chemical sedimentary rocks are made of minerals precipitated from ions dissolved in solution, and created without the aid of living organisms. An Introduction to Geology 2017-01-01T00:00:00Z Just the natural bits will do, which is why amethyst is so much more abundant in igneous than sedimentary rocks. The Origin of Amethysts May Leave You All Tingly 2019-03-03T05:00:00Z The bedrock was made of finely layered sedimentary rocks that formed in water several billion years ago, but these waters were highly salty and acidic. NASA’s Mars Rover Opportunity Concludes a 15-Year Mission 2019-02-13T05:00:00Z But sedimentary rocks typically form at the bottoms of lakes and oceans, not at the tops of mountains. How NASA’s Curiosity Rover Weighed a Mountain on Mars 2019-01-31T05:00:00Z Examples would be granite, gneiss, volcanic rock, and sedimentary rock that has not been folded. Physical Geology 2015-01-01T00:00:00Z Inorganic chemical sedimentary rocks form in environments where ion concentration, dissolved gasses, temperatures, or pressures are changing, which causes minerals to crystallize. An Introduction to Geology 2017-01-01T00:00:00Z Thousands of such rare fossils pepper Bears Ears, a sweep of buttes and badlands whose candy-striped sedimentary rocks catalog hundreds of millions of years of Earth's history. Scientists sue to protect Utah monument—and fossils that could rewrite Earth’s history 2019-01-17T05:00:00Z Now, a team of astronomers says that the early sun was actually more massive than we thought—and that proof of its mass should be found in sedimentary rocks on Mars. Top stories: CRISPR babies fallout, research funders’s tax havens, and our ancient shrinking Sun 2018-12-07T05:00:00Z It consists of layer upon layer of sedimentary rock, which offer an easy-to-read history book of Martian geology. How NASA’s Curiosity Rover Weighed a Mountain on Mars 2019-01-31T05:00:00Z Trellis drainage patterns typically develop where sedimentary rocks have been folded or tilted and then eroded to varying degrees depending on their strength. Physical Geology 2015-01-01T00:00:00Z Inorganic chemical sedimentary rocks are formed when minerals precipitate out of an aqueous solution, usually due to water evaporation. An Introduction to Geology 2017-01-01T00:00:00Z Two of them—ancient lakebeds filled with layers of sandstone and other sedimentary rocks, 2300 kilometers apart—proved to be insect bonanzas, with impressions of wings, larval cases, and other insect remains. Ancient insect graveyards reveal an explosion in bug diversity 237 million years ago 2018-09-05T04:00:00Z This occurred if a well dumped its wastewater into softer sedimentary rock. How energy companies set off earthquakes miles away from their waste dumps 2018-08-30T04:00:00Z The vast majority of these coccoliths fall to the ocean floor to accumulate with silt and other materials to ultimately become sedimentary rocks. This alga may be seeding the world’s skies with clouds 2018-08-15T04:00:00Z Primary porosity is represented by the spaces between grains in a sediment or sedimentary rock. Physical Geology 2015-01-01T00:00:00Z However, biochemical sedimentary rocks rely on biological processes to extract the dissolved materials out of the water. An Introduction to Geology 2017-01-01T00:00:00Z But especially in the novel, these things just settle in you and you become like a sedimentary rock. Arundhati Roy: ‘The point of the writer is to be unpopular’ 2018-06-17T04:00:00Z Beginning in the 1970s, a few studies showed that several types of sedimentary rock contain nitrogen from long-dead plants, algae and animals deposited on the ancient seafloor. Mystery of the Earth's Missing Nitrogen Solved 2018-05-29T04:00:00Z It's dominated by sedimentary rocks that built up gradually, rather than volcanic rocks that provide a precise time marker. Colombian scientists race to study once-forbidden territory before it is lost to development—or new conflict 2018-04-26T04:00:00Z Unconsolidated sediments are generally weaker than sedimentary rocks because they are not cemented and, in most cases, have not been significantly compressed by overlying materials. Physical Geology 2015-01-01T00:00:00Z This biochemical extraction and secretion is the main process for forming limestone, the most commonly occurring, non-clastic sedimentary rock. An Introduction to Geology 2017-01-01T00:00:00Z About 0.5% to 1% of the rocks in the range contain carbon, the organic remains of fossilized life buried in sedimentary rocks like shale. Eroding mountains could release, not trap, greenhouse gases 2018-04-12T04:00:00Z The uranium is found in cylinder-shaped deposits of broken sedimentary rock. US scientists study impact of uranium in Grand Canyon region 2018-03-12T04:00:00Z But that sedimentary rock also contains uranium, which made it more commercially attractive than other parts of Bears Ears. Spectacular fossils found at Bears Ears — right where Trump removed protections 2018-02-22T05:00:00Z Here the different layers of the sedimentary rock have different resistance to erosion. Physical Geology 2015-01-01T00:00:00Z In contrast to detrital sediment, chemical, biochemical, and organic sedimentary rocks are classified based on mineral composition. An Introduction to Geology 2017-01-01T00:00:00Z Finally, there is the large group of other twentieth-century geoscientists who quantified the theory of plate tectonics by using magnetic reversals recorded in igneous and sedimentary rocks. How the planet’s poles keep trading places 2018-01-29T05:00:00Z Like coal, it often shares space with fossils in Utah’s sedimentary rock formations. How Trump's cuts to public lands threaten future dinosaur discoveries 2018-01-30T05:00:00Z It appears to be slipping on a weak layer of sedimentary rock. Can experts predict collapse at Washington’s Rattlesnake Ridge? 2018-01-21T05:00:00Z Over time, the igneous rock of the oceanic crust gets covered with layers of sediment, which eventually become sedimentary rock, including limestone, mudstone, chert, and turbidites. Physical Geology 2015-01-01T00:00:00Z Chemical sedimentary rocks consisting of halite are called rock salt. An Introduction to Geology 2017-01-01T00:00:00Z Scientists estimated the penguin’s size based on the fossilized remains of wing and leg bones found in sedimentary rock. Human-Size Penguin Fossils Discovered 2017-12-13T05:00:00Z The Santa Barbara County Public Health Department says the smoldering fire is due to friction causing spontaneous combustion of oil shale embedded in sedimentary rock. Natural oil shale fire smolders at beach near Santa Barbara 2017-11-28T05:00:00Z He created a map of what the world looked like 66 million years ago and used present day measurements of sedimentary rocks and organic compounds to estimate the global distribution of hydrocarbons during that time. Dinosaurs Might Not Be Extinct Had the Asteroid Struck Elsewhere 2017-11-09T05:00:00Z The Toby Formation is unique in this area; most of the rest of the late Proterozoic clastic sedimentary rocks in this region do not have glacial dropstones. Physical Geology 2015-01-01T00:00:00Z When the organisms die, the shells accumulate on the ocean floor and can form the sedimentary rock chert. An Introduction to Geology 2017-01-01T00:00:00Z And here, the new delta is made from old sedimentary rocks, many laid down in very different conditions. Treat Bag Geology 2017-10-28T04:00:00Z The ichthyosaur was embedded in extremely hard sedimentary rock, and its excavation was grueling work: Today, the region’s climate is arid and harsh, with temperatures hitting more than 95 degrees Fahrenheit. Stunning Jurassic 'Sea Monster' Found in India 2017-10-25T04:00:00Z Typically, geologists choose deep saline aquifers that are made of sedimentary rock, found kilometres below Earth's surface. Emissions: We have the technology : Nature : Nature Research 2017-10-10T04:00:00Z The sedimentary rock that these mountains are made of formed in ocean water over 500 million years ago. Physical Geology 2015-01-01T00:00:00Z This is because the majority of the Earth’s surface is made up of sedimentary rocks and their common predecessor, sediments. An Introduction to Geology 2017-01-01T00:00:00Z On top of it, a layer of sedimentary rock rich in iron ore formed nearly two million years ago, when the region was ocean floor. In Northern Minnesota, Two Economies Square Off: Mining vs. Wilderness 2017-10-12T04:00:00Z Scientists said on Wednesday they found indirect evidence of life in the form of bits of graphite contained in sedimentary rocks from northern Labrador that they believe are remnants of primordial marine microorganisms. Canadian rocks hold some of oldest evidence of life on Earth 2017-09-27T04:00:00Z Surface tension, the immiscibility of supercritical CO2 with brine and layer on layer of sedimentary rock keep the CO2 from escaping to the surface. Emissions: We have the technology : Nature : Nature Research 2017-10-10T04:00:00Z If and when deposits like these are turned into sedimentary rocks, the textures of those rocks will vary significantly. Physical Geology 2015-01-01T00:00:00Z Even though sedimentary rocks can form in drastically different ways, their origin and creation have one thing in common, water. An Introduction to Geology 2017-01-01T00:00:00Z This one made a splash landing in a warm, shallow sea before getting embedded in sedimentary rocks — to be eroded out some 70 million years later. Geode : Nature : Nature Research 2017-08-29T04:00:00Z Scientists said on Wednesday they found indirect evidence of life in the form of bits of graphite contained in sedimentary rocks from northern Labrador that they believe are remnants of primordial marine microorganisms. Canadian rocks hold some of oldest evidence of life on Earth 2017-09-27T04:00:00Z Hydraulic fracturing, or fracking, is a technique designed to recover gas and oil from shale, a sedimentary rock found worldwide. Fracking: Shale rock professor says UK gas reserves 'hyped' - BBC News 2017-08-16T04:00:00Z Importantly, when we describe sedimentary rocks that formed millions of years in the past, we can use those properties to make inferences about the conditions that existed during their formation. Physical Geology 2015-01-01T00:00:00Z It is one of the main agents involved in creating the minerals in chemical sedimentary rock. An Introduction to Geology 2017-01-01T00:00:00Z The researchers examined them using sophisticated new techniques including CT scans and established their age by dating the sedimentary rock in which they were found. Fossils cast doubt on human lineage originating in Africa 2017-05-22T04:00:00Z The sedimentary rocks around this channel may well be the consequence of flood deposits. ExoMars: Rover scientists to study Mawrth Vallis option - BBC News 2017-03-28T04:00:00Z The scientists found thread-like fossils and more complex "fleshy" colonies in sedimentary rock from central India. 'Oldest plants on Earth' discovered - BBC News 2017-03-14T04:00:00Z In addition to these principles that apply to all sedimentary rocks, a number of other important characteristics of sedimentary processes lead to the development of distinctive sedimentary features in specific sedimentary environments. Physical Geology 2015-01-01T00:00:00Z It also is a weathering and erosion agent, producing the grains that become detrital sedimentary rock. An Introduction to Geology 2017-01-01T00:00:00Z That’s the conclusion a team of scientists is making after discovering 1.6-billion-year-old fossilized cells in sedimentary rocks collected from central India. Indian rocks may harbor 1.6-billion-year-old ancestors of complex life 2017-03-14T04:00:00Z The human brain didn’t evolve like a piece of sedimentary rock, with layers of increasing cognitive sophistication slowly accruing over time. How to Become a ‘Superager’ 2016-12-31T05:00:00Z Softer and younger sedimentary rocks were then eroded away, leaving the more resistant rocks exposed to form the present-day landforms. Satellite Eye on Earth: December 2016 – in pictures 2017-01-04T05:00:00Z The various structures described above are critical to understanding and interpreting the formation of sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z These iron oxides coat and bind mineral grains together into sedimentary rocks in a process called cementation and often give these rocks a dominant color. An Introduction to Geology 2017-01-01T00:00:00Z The findings also shed light on how feathers were arranged on these dinosaurs, because 3D features are often lost due to the compression that occurs when corpses become fossilised in sedimentary rocks. 'Beautiful' dinosaur tail found in amber - BBC News 2016-12-08T05:00:00Z Like sedimentary rock, new layers keep accumulating, and that also applies to the team rosters. With Glut of Vice Captains at the Ryder Cup, Will Tiger Woods Fetch Lunch? 2016-09-29T04:00:00Z Americans look anything but sedentary here among the formations of sedimentary rock. The essential guide to all 59 U.S. national parks 2016-08-15T04:00:00Z We won’t be covering fossils in any detail in this book, but they are extremely important for understanding sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z Chemical sedimentary rocks are precipitated from water saturated with dissolved minerals. An Introduction to Geology 2017-01-01T00:00:00Z And there is no lack of basalt formations on land or offshore, which could make CCS possible for power plants “not near sedimentary rocks or depleted oil wells,” Matter adds. Underground injections turn carbon dioxide to stone 2016-06-10T04:00:00Z They find that the underlying sedimentary rocks at the modern front of the glacier are heavily eroded, as are the rocks in fjords deep in the interior of the catchment. Rocks record Totten Glacier's rapid retreat history - BBC News 2016-05-19T04:00:00Z Numerous, multi-coloured lines on the sides of the hill show that it consists of many thin layers of sedimentary rock. Satellite Eye on Earth: January 2016 - in pictures 2016-02-09T05:00:00Z Of course, fossils can be used to date sedimentary rocks, but equally importantly, they tell us a great deal about the depositional environment of the sediments and the climate at the time. Physical Geology 2015-01-01T00:00:00Z Diagenesis may also reduce the pore space, or open volume, between sedimentary rock grains. An Introduction to Geology 2017-01-01T00:00:00Z Most researchers favor formations of sedimentary rock, often sandstone harboring briny groundwater or depleted oil wells, because industry has long experience in working with them. Underground injections turn carbon dioxide to stone 2016-06-10T04:00:00Z On Earth, tridymite generally forms at high temperatures in volcanic or metamorphic rocks, not a finely layered sedimentary rock like Buckskin. Mars Rover Finds Changing Rocks, Surprising Scientists 2015-12-17T05:00:00Z At Everest's famous Yellow Band, a geological feature of sedimentary rock that is light yellow, Baig slipped and got quite a scare. First Pakistani woman to summit Everest encourages women to 'climb their own mountains' 2015-11-05T05:00:00Z The sedimentary rocks of the Nanaimo Group provide a useful example for understanding groups, formations, and members. Physical Geology 2015-01-01T00:00:00Z Sorting describes the range of grain sizes within sediment or sedimentary rock. An Introduction to Geology 2017-01-01T00:00:00Z “It’s the same sort of sedimentary rock formed by glaciers.” Time erases glacial landmarks from Mission, Swan mountains 2015-11-01T04:00:00Z Fracking uses mixtures of water, chemicals and sand injected deep underground at high pressure to open cracks in shale and other sedimentary rock, releasing oil or natural gas. Researchers finish study of Michigan oil, gas fracking 2015-09-23T04:00:00Z An archaeological survey conducted in the 1970s found the Bibra lake north site contained more than 2,000 artefacts, including some made of clay, quartz, glass and a fossil-containing type of sedimentary rock called chert. Indigenous site 'older than pyramids' in Perth freeway's path taken off heritage register 2015-09-22T04:00:00Z Many other types of organisms went extinct at this time, and the boundary between the two periods marks the division between sedimentary rocks with Cretaceous organisms below, and Paleogene organisms above. Physical Geology 2015-01-01T00:00:00Z Knowing where and how a particular sedimentary rock was formed can help geologists paint a picture of past environments—such as a mountain glacier, gentle floodplain, dry desert, or deep-sea ocean floor. An Introduction to Geology 2017-01-01T00:00:00Z Upthrust and folded sedimentary rock is visible below the ridges and peaks. Tobacco Root Mountains pack recreational punch 2015-09-19T04:00:00Z Italian artist Leonardo da Vinci was one of the first naturalists to both understand the origin of sedimentary rocks and recognize fossils as petrified remains of former living animals. Leonardo da Vinci's Geological Observations Revolutionized Renaissance Art 2015-07-31T04:00:00Z Diatomite bought the land in the 1950s for a chalky sedimentary rock of the same name. Eagle ‘hot spot’ in Virginia could be replaced by a golf course and resort 2015-07-21T04:00:00Z Figure 6.2 The rock cycle, showing the processes related to sedimentary rocks on the right-hand side. Physical Geology 2015-01-01T00:00:00Z Abyssal sedimentary rocks form on the abyssal plain. An Introduction to Geology 2017-01-01T00:00:00Z Photograph: Junchang Lü The near complete skeleton of the feathered raptor was found in sedimentary rock that formed in ancient lake beds in China’s Liaoning Province. Zhenyuanlong suni: biggest ever winged dinosaur is found in China 2015-07-16T04:00:00Z Pending funding for a second trip next summer, these 36 students will be travelling to Arizona and Utah to learn about sedimentary rocks more thoroughly. STEMFORCE: Building the next generation of geoscientists 2015-07-06T04:00:00Z He said he was doing horizontal drilling in the Tuscaloosa Marine Shale, a sedimentary rock formation containing oil that stretches from Mississippi across Louisiana, in 1992. Man who challenged power plant resists easy labels 2015-03-01T05:00:00Z In this textbook, we divide sedimentary rocks into two main types: clastic and chemical. Physical Geology 2015-01-01T00:00:00Z This unconformity was actually an ancient landscape surface on which sedimentary rock C was subsequently deposited perhaps by a marine transgression. An Introduction to Geology 2017-01-01T00:00:00Z Hydraulic fracturing, or fracking, uses mixtures of water, chemicals and sand injected deep underground at high pressure to open cracks in shale and other sedimentary rock, releasing oil or natural gas. Report offers options for new fracking rules in Michigan 2015-02-20T05:00:00Z Mars lacks plate tectonics, and volcanoes do not spew out of sedimentary rock. Curiosity Rover’s Quest for Clues on Mars 2014-12-08T05:00:00Z But they are aiming at the right targets: cost, bidding flexibility, sustainability, inclusivity and an Olympic program weighed down by too much sedimentary rock. A Defining Moment for the Olympic Games 2014-12-05T05:00:00Z Chemical sedimentary rocks are mainly composed of material that has been transported as ions in solution. Physical Geology 2015-01-01T00:00:00Z If limestone or other calcareous sedimentary rocks are present adjacent to the magmatic body, then another type of ore deposit called a skarn deposit can form. An Introduction to Geology 2017-01-01T00:00:00Z That makes Black Beauty not only a cosmic blessing—sedimentary rocks are fragile and thought unlikely to survive interplanetary launches—but also a boon for astrobiologists. Feature: A castaway from ancient Mars 2014-11-25T05:00:00Z More remarkable still, the mountain is layer upon layer of sedimentary rock. Curiosity Rover’s Quest for Clues on Mars 2014-12-08T05:00:00Z "We're most interested to find clues as to the aqueous geochemistry which resulted in cementation of the sedimentary rocks," he told the BBC this week. Mars rover drills for rock sample 2014-05-06T16:59:47Z It is important to note that in some textbooks coal is described as an “organic sedimentary rock.” Physical Geology 2015-01-01T00:00:00Z Other sedimentary rocks are made by the direct chemical precipitation of minerals rather than eroded sediments and are known as chemical sedimentary rocks. An Introduction to Geology 2017-01-01T00:00:00Z Both features would have buried organic matter quickly, leading to its preservation in sedimentary rock. ExoMars scientists narrow down landing sites 2014-04-02T17:20:24.303Z In sedimentary rock, each layer encases the geological conditions of the time it formed, each a page from the book of Mars’ history. Curiosity Rover’s Quest for Clues on Mars 2014-12-08T05:00:00Z Some 10% of all sedimentary rock is limestone, which is pretty extraordinary when you consider that it represents the concentrated bodily remains of living creatures. Calcium, building block for the world 2014-03-04T00:20:20Z Clastic sedimentary rocks in which a significant proportion of the clasts are larger than 2 mm are known as conglomerate if the clasts are well rounded, and breccia if they are angular. Physical Geology 2015-01-01T00:00:00Z Upon death, their hard parts accumulate on the ocean floor as sediments and eventually may become the sedimentary rock limestone. An Introduction to Geology 2017-01-01T00:00:00Z The prints appeared at low tide last May in soft, sedimentary rock when a layer of protective sand was stripped away by the North Sea, and were destroyed by the surf within weeks. Ancient Footprints Throw Early Human Pre-History Into Turmoil 2014-02-11T17:00:00Z The Green River Formation, a field of sedimentary rock beneath Colorado, Utah and Wyoming, contains the world’s largest deposits of oil shale. State-owned assets: Setting out the store 2014-01-09T16:00:03Z We see different igneous rock types, sedimentary rock types... this is a very complex meteorite. Meteorite 'is oldest chunk of Mars' 2013-11-21T02:29:38Z Some examples of clastic sedimentary rocks are shown on Figure 6.8. Physical Geology 2015-01-01T00:00:00Z Clay minerals form a complex family and are an important component of many sedimentary rocks. An Introduction to Geology 2017-01-01T00:00:00Z And it has drilled into sedimentary rocks and consumed the powdery extract to analyze its composition. Curiosity Celebrates An Earth-Year On Mars 2013-08-07T04:15:00.803Z But all the discoveries are being made by robots, from planets in distant solar systems to sedimentary rocks on Mars. Nasa's job is not to 'titillate' 2013-05-13T00:37:19Z Some living organism ended its life as a smear of black carbon in a sedimentary rock. Some facets of the geology of diamonds 2013-05-09T13:15:00.553Z There is some overlap between the two because almost all clastic sedimentary rocks contain cement formed from dissolved ions, and many chemical sedimentary rocks include some clasts. Physical Geology 2015-01-01T00:00:00Z They are usually found in igneous rocks, such as granite, rhyolite, and basalt as well as metamorphic rocks and detrital sedimentary rocks. An Introduction to Geology 2017-01-01T00:00:00Z Shale, a fine-grained type of sedimentary rock, underlies much of the nation, according to Mr. Small, a geologist. The Texas Tribune: Time for Texas to Get Ready for the Shale Boom 2013-04-27T22:46:03Z It is not a "chilled margin" because the granite displays an abrupt, knife-sharp contact with the sedimentary rock. [Technical Comment] Comment on "Bilaterian Burrows and Grazing Behavior at >585 Million Years Ago" 2013-02-21T19:25:28.400Z The rock selected for the first drilling is a very fine grained sedimentary rock cut through with veins of what appear to be a calcium sulphate. Mars rover hammers down into rock 2013-02-03T11:05:40Z The most common chemical sedimentary rock, by far, is limestone. Physical Geology 2015-01-01T00:00:00Z Clastic or detrital sedimentary rocks are made from pieces of bedrock, sediment, derived primarily by mechanical weathering. An Introduction to Geology 2017-01-01T00:00:00Z As researchers studied images of the McLaughlin Crater, a crater 57-miles across and 1.4 miles deep that formed as the result of an impact with a large meteor, they noticed sedimentary rocks. NASA Finds Remains Of Ancient Martian Lake 2013-01-21T22:51:27Z "But these are the best-preserved sedimentary rocks we know of, the ones most likely to preserve the really tiny structures and chemicals that provide evidence for life." Fossils in Western Australia could hold clues for life on Earth ... and beyond 2013-01-08T14:01:11Z Microfossils of bacteria in particular are plentiful in sediments of all ages; they have been found in the oldest intact sedimentary rocks known, 3.5-billion year-old deposits in Australia. Archaebacteria: The Third Domain of Life Missed by Biologists for Decades 2013-01-01T00:45:00.170Z Biological processes are important in the formation of some chemical sedimentary rocks, especially limestone and chert. Physical Geology 2015-01-01T00:00:00Z This creates some overlap between the two categories, since clastic sedimentary rocks may include chemical sediments. An Introduction to Geology 2017-01-01T00:00:00Z The base of the mountain contains layers of sedimentary rocks including clays that are more likely to contain organics. The Lede Blog: Mars Rover Discovery Revealed 2012-12-04T21:19:40Z The US Geological Survey is conducting the largest study ever to measure how much of it sedimentary rock formations around the country might be able to store. Carbon capture: Going underground 2012-08-16T15:04:05Z By investigating the layers of sedimentary rock on Mount Sharp, mission scientists hope to reconstruct the climate and environment of early Mars and tell whether it could have been once been habitable for life. Mars Looks Quite Familiar, if Only on the Surface 2012-08-13T21:27:29Z Through careful observation over the past few centuries, geologists have discovered that the accumulation of sediments and sedimentary rocks takes place according to some important geological principles, as follows: Physical Geology 2015-01-01T00:00:00Z Geologists use provenance to discern the original source of sediment or sedimentary rock. An Introduction to Geology 2017-01-01T00:00:00Z For McBride, the discovery is an example of why he still finds passion in his lifelong work studying sedimentary rocks, the ones most commonly found on the earth's surface. Tiny remnants of war found in Omaha Beach sand 2012-06-05T16:53:43Z He noticed sedimentary rock and speculated that it might hold the remains of ancient human ancestry. About New York: African Fossils May Show the Future of Climate Change 2012-05-23T01:34:09Z Therefore, we spent most of the day looking at the structure and composition of the sedimentary rocks preserved in the area to learn about the environmental conditions under which they were likely. Scientist at Work Blog: From Brazil's Book of Rocks 2012-04-17T21:33:00Z While doing his work, he had many opportunities to look at the Paleozoic and Mesozoic sedimentary rocks of the region, and he did so in a way that few had done before. Physical Geology 2015-01-01T00:00:00Z Biochemical sedimentary rocks are formed from shells and bodies of underwater organisms. An Introduction to Geology 2017-01-01T00:00:00Z Shale is soft, finely stratified sedimentary rock that formed from consolidated mud or clay. UK Has Vast Shale Gas Reserves, Geologists Say 2012-04-17T15:45:03.073Z The Pedra de Fogo Formation is composed of sedimentary rocks — rocks that are formed from sediment, generated by the erosion of older rocks, which was redeposited elsewhere. Scientist at Work Blog: How Old is the 'Fire Stone'? 2012-04-13T19:27:53Z It’s a rugged, canyon-filled landscape resting on high blocks of limestone and sedimentary rock. Scientist at Work Blog: Learning on the Road to Nowhere in Madagascar 2012-04-02T21:23:05Z A clastic sedimentary rock is made up of older rock and mineral fragments, and when the rock forms it is almost certain that all of the fragments already have daughter isotopes in them. Physical Geology 2015-01-01T00:00:00Z Organic sedimentary rocks come from organic material that has been deposited and lithified, usually underwater. An Introduction to Geology 2017-01-01T00:00:00Z Similarly, Susan Hovorka, a sequestration expert and senior research scientist at the University of Texas, Austin, said sedimentary rock is very thick. Can Fracking and Carbon Sequestration Co-Exist? 2012-03-16T17:15:00.200Z The structure and composition of sedimentary rocks informs us about the environments in which they were deposited. Scientist at Work Blog: How Old is the 'Fire Stone'? 2012-04-13T19:27:53Z Most of the islands are made up of volcanic and sedimentary rocks. A Racial Study of the Fijians 2012-03-15T02:00:31.197Z If we dated a number of individual grains in the sedimentary rock, we would likely get a range of different dates, all older than the age of the rock. Physical Geology 2015-01-01T00:00:00Z Banded iron formation deposits commonly formed early in Earth’s history, but this type of chemical sedimentary rock is no longer being created. An Introduction to Geology 2017-01-01T00:00:00Z Some of the gneiss and schist in these areas may have begun life as sedimentary rocks, but they’ve been so transformed it’s hard to know for sure. M lange et Trois: A Trip Across Subduction Zone Madness 2012-03-07T22:15:00.213Z There are districts in which are found short fissures, generally confined to certain horizons in sedimentary rocks, such as the limestones of the great Mississippi Valley, from which are mined lead and zinc ores. The Business of Mining A brief non-technical exposition of the principles involved in the profitable operation of mines 2012-02-18T03:00:17.387Z "Ancient rocks when they form, whether it's lava cooling or sedimentary rock solidifying, will lock in the magnetic orientation," explained Mr Mitchell. America and Asia 'will join up' 2012-02-08T18:06:28Z It might be possible to date some chemical sedimentary rocks isotopically, but there are no useful isotopes that can be used on old chemical sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z Geologists analyze sedimentary rock facies to interpret the original deposition environment, as well as disruptive geological events that may have occurred after the rock layers were established. An Introduction to Geology 2017-01-01T00:00:00Z We argue that a detailed understanding of the depositional setting, mineralogy, and geologic history of Precambrian sedimentary rocks indicates that the Fe isotope record dominantly reflects biological fractionations and Fe redox processes. [Technical Comment] Comment on ?Abiotic Pyrite Formation Produces a Large Fe Isotope Fractionation? 2012-02-02T18:55:36.490Z The consideration and history of the different formations will be taken in their sequence of time, as far as the stratified or sedimentary rocks are concerned. Early Days in North Queensland 2012-01-24T03:00:29.987Z The assemblage is not a perfectly homogeneous one but includes both igneous and sedimentary rocks, but the former preponderate. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z Radiocarbon dating can be applied to sediments and sedimentary rocks, but only if they are younger than 60 ka. Physical Geology 2015-01-01T00:00:00Z The rock cycle shows that both igneous and sedimentary rocks can become metamorphic rocks. An Introduction to Geology 2017-01-01T00:00:00Z A similar type of alteration, the development of white mica, quartz and tourmaline, is found sometimes in sedimentary rocks around granite masses. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 "Greek Law" to "Ground-Squirrel" 2011-12-05T03:00:51.527Z It was cold when upheaved, tearing apart the superincumbent stratified sedimentary rocks, which disappeared from the summits, and on all sides about these upheavals were twisted, contorted, thrown back, and fissured. Cornwall 2011-12-05T03:00:38.530Z This was near a geological frontier where the igneous and sedimentary rocks joined, and the neighbourhood was highly mineralized, there being iron, coal, and gold within a short distance. The Inhabitants of the Philippines 2011-11-23T03:00:21.653Z How did William Smith apply the principle of faunal succession to determine the relative ages of the sedimentary rocks of England and Wales? Physical Geology 2015-01-01T00:00:00Z Low-grade metamorphism begins at temperatures and pressures just above sedimentary rock conditions. An Introduction to Geology 2017-01-01T00:00:00Z And he complains that other researchers have not sufficiently adopted his vision of Mars--as a planet with layers of sedimentary rock created and sculpted by water and wind. Mars Observer Mike Malin Set for 9th Mission to Red Planet 2011-11-21T22:45:13.600Z Cordierite-gneisses are a special group of great interest and possessing many peculiarities; they are partly, if not entirely, foliated contact-altered sedimentary rocks. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z The formation of these particular sedimentary rocks by weathering of igneous rocks involves only a little carbon dioxide and water. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Geosynclinal sediments — which eventually turn into sedimentary rocks — may be many thousands of metres thick. Physical Geology 2015-01-01T00:00:00Z A nonconformity occurs when sedimentary rock is deposited on top of igneous and metamorphic rocks as is the case with the contact between the strata and basement rocks at the bottom of the Grand Canyon. An Introduction to Geology 2017-01-01T00:00:00Z The researchers measured the ratios of two isotopes, oxygen-16 and oxygen-18, in this enamel, then compared them with the ratios in the sedimentary rocks found in the area. Tooth Chemistry Reveals Sauropod Sojourns 2011-10-27T17:15:01.957Z Many gneisses are undoubtedly sedimentary rocks that have been brought to their present state by such agents of metamorphism as heat, movement, crushing and recrystallization. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z These processes include the chemical reorganization of the minerals of the crust, a process which is illustrated by the metamorphism of sedimentary rocks into crystalline forms. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z In the diagrams shown here, a road cut is constructed in sedimentary rock with well-developed bedding. Physical Geology 2015-01-01T00:00:00Z The zircon grains were incorporated into metasedimentary host rocks, sedimentary rocks showing signs of having undergone partial metamorphism. An Introduction to Geology 2017-01-01T00:00:00Z With its thick piles of sedimentary rock, the Arctic may hold some of Earth's biggest hydrocarbon stores. Redrawing the Arctic map: The new north 2011-10-12T17:20:30.577Z The Great Valley Region consists of folded sedimentary rocks, extensive erosion having removed the soft layers to form valleys, leaving the hard layers as ridges, both layers running in a N.E.-S.W. direction. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 7 "Geoponici" to "Germany" 2011-09-26T02:00:25.313Z As the sedimentary rocks have for the most part been laid down under water, and more especially on the sea-floor, they are often spoken of as “aqueous,” in contradistinction to the igneous rocks. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Metamorphic rocks form when either igneous or sedimentary rocks are heated and squeezed to the point where some of their minerals are unstable and new minerals form to create a different type of rock. Physical Geology 2015-01-01T00:00:00Z Detrital sedimentary rocks are less useful because they are made of minerals derived from multiple parent sources with potentially many dates. An Introduction to Geology 2017-01-01T00:00:00Z Would a geology project on organic sedimentary rocks, for example, open as many wallets as the charismatic quail? Scientists Turn to Crowds on the Web to Finance Their Projects 2011-07-11T18:02:21Z The various systems of sedimentary rocks are known now to be purely artificial if convenient divisions. The Gospel Of Evolution From "The Atheistic Platform", Twelve Lectures 2011-05-31T02:00:36.420Z Certainly ancient marine sedimentary rocks cover at the present day a much more extensive area than that in which they are now being elaborated. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z At depths of hundreds of metres or more, they become compressed and cemented into sedimentary rock. Physical Geology 2015-01-01T00:00:00Z Since the Carboniferous period coal has been found at many horizons in the sedimentary rocks, and peat is being accumulated at the present day. North America 2011-05-05T02:00:20.027Z In the oldest of the sedimentary rocks, the remains of animals occur in vast numbers; nor will any one, I trust, of ordinary intelligence, doubt but these relics once constituted living beings. The Religion of Geology and Its Connected Sciences 2011-02-28T03:00:28.890Z We have already briefly described certain sedimentary rocks, such as conglomerate, sandstone, and shale, and have in some measure touched upon their structure as rock-masses. Geology 2011-02-20T03:00:12.660Z It is from the sedimentary rocks that the main portion of geological history is derived. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z What processes normally take place in the transformation of sediments to sedimentary rock? Physical Geology 2015-01-01T00:00:00Z Many of the rich silver-mines of the Pacific mountains occur in fissures and cavities in sedimentary rocks, mainly limestone. North America 2011-05-05T02:00:20.027Z Some contain only local rock types, and in several places this consists of Beacon Supergroup sedimentary rocks and the Jurassic Ferrar sills that intrude them. Scientist at Work: Rocks, Zircon Zapping and a Big Shrimp 2011-01-07T21:02:35Z Immigrants have arrived in waves over time, leaving layers here like sedimentary rock — from Germany, Poland, Bosnia, Albania, Bangladesh, Yemen and more. In Michigan, a City Pleads for a Bankruptcy Option 2010-12-27T20:24:25Z Besides the limestones, the visible parts of the terrestrial crust are, in large measure, composed of sedimentary rocks which were originally laid down on the sea-bottom. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z With the exception of volcanic rocks and some sedimentary rocks, most rocks are formed at some depth within the crust. Physical Geology 2015-01-01T00:00:00Z In addition to the various coal deposits referred to above there is a second series of organic compounds found stored in sedimentary rocks which consists of hydrocarbon. North America 2011-05-05T02:00:20.027Z The black mud is riddled with the remains of life, and eventually form into sedimentary rock. Tracing Oil Reserves to Their Tiny Origins 2010-08-02T22:33:00Z Their scars have accumulated like layers of sedimentary rock, each marking a different crisis — homelessness, occupation, war, dependency. Hemmed-In Gazans Find Themselves Locked in Despair 2010-07-14T05:44:00Z Its members are specially distinguished by a prevailing fissile, or schistose, structure which they did not at first possess, and which differs from anything found in unaltered igneous or sedimentary rocks. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Lithification is what happens — at depths of hundreds to thousands of metres — when those compacted sediments become cemented together to form solid sedimentary rock. Physical Geology 2015-01-01T00:00:00Z About this central core the upturned edges of the sedimentary rocks form concentric zones, the oldest in the series being next the schists, and the youngest 10 to 40 or 50 miles distant. North America 2011-05-05T02:00:20.027Z A main barrier was shale, a sedimentary rock made of clay and silt. Tracing Oil Reserves to Their Tiny Origins 2010-08-02T22:33:00Z In addition, all the Martian meteorites consist of hard igneous rock; the more fragile sedimentary rock, which is most likely to contain sign of life, falls apart before reaching Earth. NASA team cites new evidence that meteorites from Mars contain ancient fossils 2010-05-04T04:00:00Z The effect is of a rippling sand dune or a weathered cliff of sedimentary rock. 2009-08-31T17:29:00Z It’s important not to assume that mechanical weathering leads only to clastic sedimentary rocks, while chemical weathering leads only to chemical sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z Geologically, Armenia consists of archaic rocks upon which, towards the north, are superimposed Palaeozoic, and towards the south later sedimentary rocks. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 5 "Arculf" to "Armour, Philip" An early indication was that petroleum discoveries were always associated with ancient beds of sedimentary rock — the kind that forms when debris rains down through water for ages and slowly grows into thick seabed layers. Tracing Oil Reserves to Their Tiny Origins 2010-08-02T22:33:00Z The whole range gives evidence of volcanic action, but it consists almost entirely of sedimentary rocks. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli In general three zones can be distinguished, a central, in which crystalline rocks prevail, and two exterior zones, in which sedimentary rocks predominate. The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide In most cases, millions of years separate the weathering and depositional processes, and both types of sedimentary rocks tend to include at least some material derived from both types of weathering. Physical Geology 2015-01-01T00:00:00Z Shale , a fine-grained, layered, sedimentary rock, generally easily crumbled. Unexplored! The hills, known as the Chiquitos, which rise from the plains of eastern Bolivia, are composed of ancient sedimentary rocks of unknown age. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 2 "Bohemia" to "Borgia, Francis" Blende is also found sporadically in sedimentary rocks; for example, in nodules of clay-ironstone in the Coal Measures, in the cement-doggers of the Lias, and in the casts of fossil shells. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 1 "Bisharin" to "Bohea" All of the sedimentary rocks are formed by a deposit of sediment from the water on the bottom of the ocean. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. An unconformity represents an interruption in the process of deposition of sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z The terrestrial rind—that is, the crust which surrounds the internal fire-ball, of solidified elements and eruptive or sedimentary rocks—consists throughout of layers superposed like the pages of a book. The Tremendous Event A series of sedimentary rocks, with characters which distinguish them from two other great series of strata—the secondary and primary—which lie beneath them. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Most of the stratified and sedimentary rocks, but not all, may be included under this term. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place Mountains of the Secondary Age were often made of Primary sedimentary rocks, or of Primary igneous rocks, so much changed that geologists call them metamorphic rocks. The Boy With the U.S. Miners However, as anyone who has gone hunting for fossils knows, that does not mean that all sedimentary rocks have visible fossils or that they are easy to find. Physical Geology 2015-01-01T00:00:00Z This is obvious from the fact that the sedimentary rocks of one age are partly formed from the destruction of the sedimentary rocks of former ages. Island Life Or the Phenomena and Causes of Insular Faunas and Floras Works of art, moreover, composed of the most indestructible materials, would have outlasted almost all the organic contents of sedimentary rocks. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Over these lie thick layers of sedimentary rocks laid down by water. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place Some of the gold was dissolved, as before, and got into the crevices of the newly deposited rocks made by erosion, known as sedimentary rocks. The Boy With the U.S. Miners There are numerous types of fossil fuels, but all of them involve the storage of organic matter in sediments or sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z Geologists have measured with some accuracy the maximum thickness of all the known sedimentary rocks. Island Life Or the Phenomena and Causes of Insular Faunas and Floras There are, therefore, in and adjacent to each chain, two classes of sedimentary rocks, the ancient and inclined beds, and the newer or horizontal. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Except for the igneous outcropping in which the mine is located, this whole valley is sedimentary rock, probably for a depth of several hundred feet. The Blue Ghost Mystery Then came another period of erosion, lasting millions of years, the gold was washed away to form new placers, or made its way into veins in the Secondary sedimentary rocks. The Boy With the U.S. Miners The geologists sought to estimate the period of time that must have been required for the deposit of the sedimentary rocks now observed to make up the outer crust of the earth. A History of Science, Volume 5(of 5) Aspects Of Recent Science Ancient sedimentary rocks, granite, and modern volcanic formations abound; gold, silver, copper, tin, iron, and coal are plentiful; and there are also some considerable deposits of early or late Tertiary age. Island Life Or the Phenomena and Causes of Insular Faunas and Floras Much of the land is covered by a thin surface deposit of clay, sand, or gravel, which is yet loose material and which shows the mode of formation of sedimentary rocks. Boy Scouts Handbook The First Edition, 1911 In lieu of the other half of their shell they attached themselves to sedimentary rocks. The Martian Cabal Kinds of Rocks Used for Macadam.—Limestone and chert are the two sedimentary rocks, employed most extensively for broken stone roads. American Rural Highways But he found that the region was mainly a primary one, in which he could detect only a single patch of sedimentary rock, existing as an unfossiliferous sandstone. The Testimony of the Rocks or, Geology in Its Bearings on the Two Theologies, Natural and Revealed The weathering of sedimentary rocks proceeds along lines already indicated for the igneous rocks. The Economic Aspect of Geology Sulphur is of two kinds, one of which is of volcanic emanation, the other being closely allied to sedimentary rocks. Scientific American Supplement, No. 647, May 26, 1888 This extraordinary tower emerges from a rounded forested hill of sedimentary rock which rises six hundred feet above the plain; from the top of that the tower rises six hundred feet still higher. The Book of the National Parks There are few sedimentary rocks which do not contain it. Manures and the principles of manuring Nor is the underlying marine limestone by any means the oldest of the sedimentary rocks of Egypt. The Testimony of the Rocks or, Geology in Its Bearings on the Two Theologies, Natural and Revealed By weathering of sedimentary rocks are produced some soils, certain commercial clays, iron ores, lead and zinc ores, and other valuable mineral products. The Economic Aspect of Geology Other conditions being the same, houses built on alluvial ground suffered most of all; and the destruction was also great in those standing on soft sedimentary rocks such as clays and friable limestones. A Study of Recent Earthquakes Many granitic and volcanic landscapes are variegated in places by accidental beds of sedimentary rock; and conversely occasional sedimentary landscapes are set off by intrusions of igneous rocks. The Book of the National Parks It is necessary, however, to remark, that in many instances one variety passes into the other, or, more correctly speaking, sedimentary rocks occur, which are mixtures of two or more of the three great classes. Elements of Agricultural Chemistry Traces of it are found in practically all igneous and most sedimentary rocks. Commercial Geography A Book for High Schools, Commercial Courses, and Business Colleges Water is the medium in which most sedimentary rocks are formed. The Economic Aspect of Geology That they were in whole or in part once beneath the sea will not be disputed; for they are in great part composed of sedimentary rocks which required a sea to form them. Fragments of science, V. 1-2 Besides variety of form, sedimentary rocks furnish a wide range of color derived from mineral dyes dissolved out of rocks by erosion. The Book of the National Parks Sandstones, or, in masons’ language, “free-stones,” from the freedom with which most of them are worked when freshly taken from the quarry, are plastic or sedimentary rocks. The American Architect and Building News, Vol. 27, Jan-Mar, 1890 Yucatan is without minerals, its geological formation being of the younger sedimentary rocks. Mexico Its Ancient and Modern Civilisation, History, Political Conditions, Topography, Natural Resources, Industries and General Development The composition of the minerals of the sedimentary rocks is such as to indicate that the constituents of the air and water have been added in important amounts to accomplish this change of mineral character. The Economic Aspect of Geology This is all sedimentary rock—it looks a lot like the country along the North Fork of the Flathead, in Montana. Spacehounds of IPC The other sedimentary rocks which figure prominently in landscape are products of land erosion which rivers sweep into seas or lakes, where they are promptly deposited. The Book of the National Parks Erosion of water and wind have bared the sedimentary rocks and exposed the layers in well defined pages so I may study this great rock-paged geology book, and indeed it's a pleasure to me. Evening Round Up More Good Stuff Like Pep The foot plateau which succeeds is composed of sedimentary rocks dating from Trias to Jurassic. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" After sedimentary rocks are formed, and in many cases covered by later sediments, they may be brought again by earth movements and erosion to the surface, where they in turn are weathered. The Economic Aspect of Geology Practically all the sedimentary rocks are of the sandstone type. Uller Uprising Zion National Monument is carved from sedimentary rock; also several distinguished reservations in our southwest which conserve natural bridges and petrified forests. The Book of the National Parks Besides these sedimentary rock there are formations like granite, showing the influence of heat. Evolution An Investigation and a Critique The crystals are found attached to the walls of cavities in decomposed igneous rocks and crystalline schists; it is also found as minute isolated crystals in many sedimentary rocks. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The sedimentary rocks as a whole contain the most voids, and therefore the largest flow and largest supply of water is often localized in them. The Economic Aspect of Geology There is a total absence of sedimentary rocks. The Andes and the Amazon Across the Continent of South America It produces scenic effects very different indeed from those resulting from volcanic and sedimentary rocks. The Book of the National Parks This outer slope varies greatly in width and is underlaid by older sedimentary rocks, cut in almost every direction by narrow deep cañons. Cave Regions of the Ozarks and Black Hills The land surface is at present largely covered with the sedimentary rocks themselves. The Birth-Time of the World and Other Scientific Essays As the igneous rocks are so much more abundant than the sedimentary rocks, the percentage of feldspars in the earth approaches the former rather than the latter figure. The Economic Aspect of Geology The oldest sedimentary rocks are devoid of fossil remains and so they are called the Azoic or Archæan. The Doctrine of Evolution Its Basis and Its Scope The higher they rose the more insistently frosts and rains concentrated upon their uplifting summits; in time all sedimentary rocks were washed away, and the granite beneath exposed. The Book of the National Parks Erosion has only partially denuded the peaks of the sedimentary rocks through which they were thrust up, or by which they were overlaid during the earlier part of106 several subsequent periods of submersion. Cave Regions of the Ozarks and Black Hills We estimate by chemical examination of igneous and sedimentary rocks the amount of sodium which has been supplied to the ocean per ton of sediment produced by denudation. The Birth-Time of the World and Other Scientific Essays The production of soil from sedimentary rocks involves the same processes as alter igneous rocks; but, starting from rocks of different composition, the result is of course different in some respects. The Economic Aspect of Geology Of course, such seams, marking the stratification of snow, are as permanent and indelible as the seams of coarser materials alternating with the finest mud in a sedimentary rock. The Atlantic Monthly, Volume 12, No. 74, December, 1863 We meet their remnants unexpectedly among the granites of the Rockies and the Sierra, and the sedimentary rocks of the west and the southwest. The Book of the National Parks The quartz is not found, as might naturally be supposed from its position among sedimentary rocks, lying in anything like a plain, even sheet of equal thickness. The Atlantic Monthly, Volume 13, No. 79, May, 1864 The entire bulk of the sedimentary rocks, such as sandstones, slates, shales, conglomerates, limestones, etc., and the salt content of the ocean, are due to the combined activity of mechanical and solvent denudation. The Birth-Time of the World and Other Scientific Essays There are no sedimentary rocks in the district. The Economic Aspect of Geology From these data we see the glacial action was prior to the sedimentary rock here, and had spent its force when elevation of coast range occurred. Scientific American Supplement, No. 832, December 12, 1891 The sedimentary rocks present a succession of organic forms, associated in groups, which have successively displaced and succeeded each other. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 In spite of the above limitations and fallacies, there can be no doubt as to the enormous value of palæontology in enabling us to work out the historical succession of the sedimentary rocks. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science It is not supported by river analyses, or by the chemical character of residual soils from sedimentary rocks. The Birth-Time of the World and Other Scientific Essays It is estimated that the feldspars make up 50 per cent of all the igneous rocks and 16 per cent of the sedimentary rocks. The Economic Aspect of Geology The granite, when it attains its highest point, is covered with a 200-foot layer of sedimentary rock called the tonto sandstone. Through the Grand Canyon from Wyoming to Mexico Though sedimentary rocks occur in Mexico, they are not the predominant feature of the country. Anahuac : or, Mexico and the Mexicans, Ancient and Modern The sedimentary rock of sandstone, shales, and marl, not only showed veins of ignitible lignite, but it was pierced by the trap which had been shot up from earth's flaming recesses. Overland So tremendous a chasm would be one of the world's greatest wonders even if, like ordinary ca�ons cut in sedimentary rocks, it were empty and its walls were simple. The Grand Cañon of the Colorado Where soils become buried under other rocks and become hardened, they are classed as sedimentary rocks and form a part of the geologic record. The Economic Aspect of Geology The same may be said of the Pancake Range and other mountain chains of igneous rock in Nevada, while the adjacent ranges composed of sedimentary rocks are rich in ore deposits of various kinds. Scientific American Supplement, No. 446, July 19, 1884 So tremendous a chasm would be one of the world's greatest wonders even if, like ordinary canyons cut in sedimentary rocks, it were empty and its walls were simple. Steep Trails California, Utah, Nevada, Washington, Oregon, the Grand Canyon On the Babewendigash River seven miles east of Seal Lake is an exposure of highly metamorphosed ancient sedimentary rocks. The Long Labrador Trail Along the Burnt River valley, the strata are evidently sedimentary rocks, altered by the intrusion of volcanic products, which in some instances have penetrated and essentially changed their original condition. The Exploring Expedition to the Rocky Mountains, Oregon and California To which is Added a Description of the Physical Geography of California, with Recent Notices of the Gold Region from the Latest and Most Authentic Sources Many residual and transported soils are to be recognized in the geologic column; in fact a large number of the sedimentary rocks ordinarily dealt with in stratigraphic geology are really transported soils. The Economic Aspect of Geology Anthracite may and does occur in sedimentary rocks of varied character, but, so far as my observation has extended, never in quantity in sandstone. Scientific American Supplement, No. 362, December 9, 1882 In speaking of sedimentary rocks, we may be said to be anticipating. Vestiges of the Natural History of Creation But if not, sooner or later, it bores up through the new sedimentary rocks, faulting them by earthquake shocks till it gets free vent, and begins its layers of alternate ash and lava once more. Town Geology All our specimens of sedimentary rocks show them much altered, and volcanic productions appear to prevail throughout the whole intervening distance. The Exploring Expedition to the Rocky Mountains, Oregon and California To which is Added a Description of the Physical Geography of California, with Recent Notices of the Gold Region from the Latest and Most Authentic Sources Others are the common igneous and sedimentary rocks used for building and road materials. The Economic Aspect of Geology Along the western base of the range a telling series of sedimentary rocks containing the early history of the Sierra are now being studied. The Mountains of California In doing this it is best to employ the methods that have long been used by geologists for the purpose of establishing the succession of the sedimentary rocks in the crust of the earth. The Evolution of Man — Volume 2 We should have a right to do so, because that would be true of most sedimentary rocks. Town Geology The organ-pipes were basaltic** in character but, to my great joy, I found the beacons were of sedimentary rock. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 No sooner are residual weathered mantles formed or sedimentary rocks deposited, whether under air or water, than processes of consolidation begin. The Economic Aspect of Geology Finally comes the Anthropozoic or Quaternary age, the age of man, three hundred thousand years, with not much addition to the sedimentary rocks. Time and Change The granite reaches the surface only in limited areas; as a rule, it is buried many miles in depth under the sedimentary rocks. Ragnarok : the Age of Fire and Gravel The most common sedimentary rocks are sandstones, limestones, conglomerates and shales. Let's Collect Rocks and Shells When these combinations had reached a certain amount they would be deposited in the form of mud upon the bed of the ocean, and thus the earliest sedimentary rocks would be formed. Story of Creation as Told By Theology and By Science The deposits are regarded as having been formed by circulating waters which collected the minerals disseminated through the sedimentary rocks, and deposited them on contact with carbonaceous matter, earlier sulphides, or other precipitating agents. The Economic Aspect of Geology In my geological studies I have had a good deal of trouble with the sedimentary rocks, trying to trace their genealogy and getting them properly fathered and mothered. Time and Change If the destroyed world possessed no sedimentary rocks, then the entire material of the comet would consist of granitic stones and dust such as constitutes clays. Ragnarok : the Age of Fire and Gravel The bright colours of the sedimentary rocks put new cheer into them. The Romance of the Colorado River The Story of its Discovery in 1840, with an Account of the Later Explorations, and with Special Reference to the Voyages of Powell through the Line of the Great Canyons The earliest sedimentary rock with which we are acquainted at present is what is known as the Laurentian formation. Story of Creation as Told By Theology and By Science Zinc ores of the first type are in veins and replacements in sedimentary rocks at shallow depths, independent of igneous association, and are supposed to have been formed by cold solutions. The Economic Aspect of Geology Most of the sedimentary rocks of New York and New England were laid down before these creatures existed. Time and Change No trace is left of their destructive powers, save the huge, unstratified, unfossiliferous deposits of clay and stones and bowlders, locked away between great layers of the sedimentary rocks. Ragnarok : the Age of Fire and Gravel The sedimentary rocks are divided according to their composition into the following classes: 1. The Elements of Geology In pursuance of the arrangement explained in the last chapter, we shall begin by examining the aqueous or sedimentary rocks, which are for the most part distinctly stratified, and contain fossils. The Student's Elements of Geology In the Appalachian region of Tennessee, Alabama, and Georgia, bauxite occurs as pockets in residual clays above sedimentary rocks, chiefly above shales and dolomites. The Economic Aspect of Geology Probably not less that one fourth of all the sedimentary rocks are limestone, which is of animal origin. Time and Change The last two classes abound on the Eastern sea-board, while the interior of our continent is composed almost exclusively of stratified sedimentary rocks. An Introduction to Chemical Science In other cases interbedded limestones and other sedimentary rocks containing marine fossils prove that at times subsidence has gained on the upbuilding and the delta has been covered with the sea. The Elements of Geology In the same region the Carboniferous limestone attains so unusual a thickness— namely, more than 4000 feet— as to appear to compensate in some measure for the deficiency of contemporaneous sedimentary rock. The Student's Elements of Geology The principal deposits of barite are found in sedimentary rocks, and especially in limestones and dolomites. The Economic Aspect of Geology I have never seen a very large natural cave in Cyprus, although the caverns beneath the superficial stratum of sedimentary rock are so general. Cyprus, as I Saw It in 1879 Above this mass I could clearly distinguish five conformable alternations, each several hundred feet in thickness, of stratified sedimentary rocks and lavas, such as have been previously described. Geological Observations on South America On the other side the weak sedimentary rocks have been worn down to lowlands. The Elements of Geology I wish some one would in a like spirit compare the thickness of sedimentary rocks with the quickest estimated rate of deposition by a large river, and other such evidence. More Letters of Charles Darwin — Volume 2 The flake graphite of the United States, principally in the Appalachian region, occurs in crystalline graphitic schists, resulting from the anamorphism of sedimentary rocks containing organic matter. The Economic Aspect of Geology So that the lofty pile of sedimentary rocks in Britain gives but an inadequate idea of the time which has elapsed during their accumulation. The Origin of Species by means of Natural Selection, 6th Edition We may infer that these ancient mountains were reduced along their margins to low plains, which were slowly lowered beneath the sea to receive a cover of sedimentary rocks. The Elements of Geology They are considered by perhaps the majority of the geologists who have studied them most carefully to be igneous rocks intruded in a molten state among the sedimentary rocks involved with them. The Elements of Geology In others, as Mount Hillers, the largest of the group, there is exposed on the summit a core of igneous rock from which the sedimentary rocks of the flanks dip steeply outward in all directions. The Elements of Geology Over 90 per cent of the world's production of iron ore is from sedimentary rocks. The Economic Aspect of Geology The solvent power of the water is thus greatly increased, and it takes up into solution various substances from the igneous and sedimentary rocks which it traverses. 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