| 单词 | chert |
| 例句 | An eruption of Mount Elgon about seven million years ago had buried the rain forest in ash, and the logs had been transformed into opal and chert. The Hot Zone 1994-01-01T00:00:00Z Quartz and chert and schist and chondrite iron scabs in granite. Unfinished Business 2011-03-31T11:15:00Z Anyone found hitting the pale, more recently formed chert stone is strongly discouraged because it splinters, making it hazardous and impossible to split successfully. Jurassic Coast cliff falls tempt fossil hunters 2023-09-09T04:00:00Z 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 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 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 Made from chert and quartz pebbles, most measured less than 2 centimeters. Archaeologists uncover oldest ochre workshop in East Asia 2022-03-02T05:00:00Z Subsurface pressure and temperature effects cause changes in the composition and properties of rocks, and from these we reap flint, chert, loess, kaolin, granite and clay. Human evolution’s ties to tectonics 2019-01-22T05:00:00Z Others include chert, banded iron formation, and a variety of rocks that form when bodies of water evaporate. Physical Geology 2015-01-01T00:00:00Z The iron oxide was deposited, usually in bands alternating with layers of chert. An Introduction to Geology 2017-01-01T00:00:00Z They were likely attracted to the site by the year-round availability of drinking water and abundant chert on the surrounding slopes that was used for making stone tools. Team finds ancient North American hunting tools in Texas 2018-10-25T04:00:00Z The team reveals they found 3 to 4-inch weapons, including spear points made of chert, under sediment they believe to be at least 15,500 years old. Oldest weapons ever discovered in North America uncovered in Texas 2018-10-25T04:00:00Z The blade was made of a hard, dark rock called chert that is similar to flint. The Final Hours of the Iceman’s Tools 2018-06-21T04:00:00Z Biological processes are important in the formation of some chemical sedimentary rocks, especially limestone and chert. 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 A Greek-Canadian team co-led by Tristan Carter of McMaster University in Hamilton, Canada, uncovered hundreds of tools embedded in the soil of a chert quarry. Neandertals, Stone Age people may have voyaged the Mediterranean 2018-04-24T04:00:00Z All modern groups of fungi are abundant in Rhynie chert samples apart from the basidiomycota, the group which includes those most familiar of fungi: mushrooms. Strangest things: fossils reveal how fungus shaped life on Earth 2018-01-16T05:00:00Z The chert that Otzi used was mined from three different areas, which were as far as 40 miles away, Dr. Wierer said. The Final Hours of the Iceman’s Tools 2018-06-21T04:00:00Z In other situations, and especially in very deep water, chert accumulates on its own, commonly in thin beds. Physical Geology 2015-01-01T00:00:00Z Biogenetic chert forms on the deep ocean floor, created from biochemical sediment made of microscopic organic shells. An Introduction to Geology 2017-01-01T00:00:00Z When the Works Progress Administration came along in the 1930s, the federal agency agreed to put chert down on the dirt runway. Georgia park has colorful history tied to aviation 2017-03-25T04:00:00Z For instance, the Mars 2020 fossil hunters will look for chert and silica—two types of minerals that, on Earth, are ideal for entombing and preserving biological material. NASA’s Bold Plan to Hunt for Fossils on Mars “If you look at the actual tomb, you have these inclined limestone layers with dark nodules of chert—exactly as drawn in the tomb plan.” Prospecting for the Pharaohs' Gold All of the layers have been folded, and the chert, being insoluble and harder than limestone, stands out. Physical Geology 2015-01-01T00:00:00Z Some can be spotted because freshly worked flint, also called chert, will have a slightly lighter color than the rest of the point. EXCHANGE: Artifacts tell Native Americans’ stories 2016-07-03T04:00:00Z Her team excavated and radiocarbon-dated the river’s sediment layers with meticulous care, and the chert knife and flakes are clearly human artifacts. Stone Knife and Mastodon Bones Point to Earlier Arrival of First Americans 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 There, Bond and his colleagues examined chert rocks—silica formations, created by the skeletons of dead sponges, that also contain many species of brachiopods. Sixth extinction, rivaling that of the dinosaurs, should join the big five, scientists say 2015-04-16T04:00:00Z BIF forms when iron dissolved in seawater is oxidized, becomes insoluble, and sinks to the bottom in the same way that silica tests do to form chert. Physical Geology 2015-01-01T00:00:00Z Its translucent Early Devonian chert sediments are renowned for their exquisite fossils. Ancient arachnid 'walks again' 2014-07-09T04:00:00Z Fossilized remains of single-celled microorganisms were found in 1958 inside a type of rock known as chert. Rover to probe whether Mars was life-friendly in the past 2012-08-04T20:19:40Z Geologically the materials are called novaculites, and are supposed to be metamorphosed sandstone silt, chert or limestone resulting from the permeation through the mass of heated alkaline siliceous waters. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z You’ll find ribbon chert all over here, the quartz layers interleaved with slate. M lange et Trois: A Trip Across Subduction Zone Madness 2012-03-07T22:15:00.213Z The dark rock is chert, which remains brittle. Physical Geology 2015-01-01T00:00:00Z A nearby outcrop of a flintlike rock called chert, they believe, was the source for many of the stone tools they found: long, triangular blades shaped with six or seven deliberate, strategic strikes. Ancient Tools Point to Early Human Migration Into Arabia 2011-11-30T22:46:14Z Among the stones in the drift at these exposures are limestone, sandstone, quartzite, diabase, gabbro, gneiss, granite, schist, and porphyry, together with pieces of flint and chert. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z Other hard rocks such as chert, quartzite, felsite, granite, sandstone and volcanic rocks very frequently are largely represented in gravels, while coal, limestone and shale are far less common. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 4 "Grasshopper" to "Greek Language" 2011-11-28T03:00:19.517Z Don’t be afraid to take a biologist along if you visit: there’s tide pools in the ribbon chert at the bottom of the head that will make them scream for joy. M lange et Trois: A Trip Across Subduction Zone Madness 2012-03-07T22:15:00.213Z At the top of the canyon is 1000 ft. of limestone with gypsum and chert, noted for the pinnacles and towers which denudation has developed. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z This widening was caused by pieces of chert having been removed from the mass, this evidently having been one of the sources whence the Indians secured material for the making of their implements. Villages of the Algonquian, Siouan, and Caddoan Tribes West of the Mississippi 2011-11-02T02:00:10.087Z Point Wilkie appears to be an isolated patch of liassic age, resting upon carboniferous sandstones and limestones, with bands of chert, of the same age as the limestones and sandstones of Melville Island. In the Arctic Seas A Narrative of the Discovery of the Fate of Sir John Franklin and his Companions 2011-10-10T02:00:18.377Z In 2002, the same Oxford group suggested well-known microfossils from the Apex chert in Australia were not the preserved forms of ancient bacteria after all. Oldest Fossils on Earth Discovered 2011-08-23T14:35:00Z If you tear yourself away from the ribbon chert, you can investigate pillow basalts, greywackes, and a nice icing of glacial till, all within a few hundred yards. M lange et Trois: A Trip Across Subduction Zone Madness 2012-03-07T22:15:00.213Z Of antiquities, I have seen nothing since leaving the Ohio valley till this day, when I picked up, in my rambles on shore, an ancient Indian dart, of chert. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z Arrow heads and spear heads made of chert, jasper, chalcedony, and obsidian, are common. American Indians 2011-04-21T02:00:55.200Z Some cherts contain tests of radiolaria, and correspond fairly closely to the siliceous radiolarian oozes which are gathering at the present day at the bottom of some of the deepest parts of the oceans. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z These objects comprise 15,528 items in total - a variety of chert blades, bladelets, chisels, and abundant flakes produced when making or repairing stone tools. Tools 'demand new American story' 2011-03-24T22:58:31Z Tear yourself away from the ribbon chert and tide pools. M lange et Trois: A Trip Across Subduction Zone Madness 2012-03-07T22:15:00.213Z Many of the rough, chipped chert chunks at Buttermilk Creek might look crude, especially when compared with a refined prototypical fluted Clovis spear point. People Were Chipping Stone Tools in Texas More Than 15,000 Years Ago 2011-03-24T19:45:00.280Z One was by striking two hard pieces of stone—such as chert or pyrites—together, which gave a spark, which was caught on tinder and blown to a flame. American Indians 2011-04-21T02:00:55.200Z Brownish cherts are found in the English Greensand; these often contain remains of sponges. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Black flint and chert, all fine, average 4 in. long. American Antiquities Auction Catalogue, January 8, 1898 2011-02-23T03:00:33.300Z They’re ribbon chert, formed in a deep ocean environment from the silica skeletons of radiolarians. M lange et Trois: A Trip Across Subduction Zone Madness 2012-03-07T22:15:00.213Z The floor of the cave was covered four or five feet in thickness with a deposit of mud or loam, and containing some rounded fragments of chert. A Manual of the Antiquity of Man 2011-02-21T03:00:07.080Z What is the nature of chert and flint nodules? Geology 2011-02-20T03:00:12.660Z The pebbles of the basal conglomerates are derived chiefly from the underlying platform of greywackes and shales and from the Radiolarian cherts and volcanic rocks in the tableland to the south. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" 2011-01-19T03:00:19.027Z Yellow chert, long, square base, point slightly damaged, but very finely made. American Antiquities Auction Catalogue, January 8, 1898 2011-02-23T03:00:33.300Z The Archean of the Vermilion district of Minnesota comprises the Soudan formation, an altered sedimentary series with banded cherts, jasper and magnetite schists; the iron ores are extensively mined. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4 "Aram, Eugene" to "Arcueil" The chert beds are very hard, and where the strata are horizontal, as above the Undercliff, project like a cornice at the top of the cliff. The Geological Story of the Isle of Wight Examples of this are chert nodules in limestone; flint nodules in chalk; clay-ironstone balls in shale, &c. Geology 2011-02-20T03:00:12.660Z In the Kapoewas district radiolarian cherts supposed to be of Jurassic age are met with. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" Yellowish chert, small, square base, very heavily notched, perfect edges, finely flaked, desirable. American Antiquities Auction Catalogue, January 8, 1898 2011-02-23T03:00:33.300Z In some parts, the rauchwacke is the predominating rock, and has its cells beautifully powdered with crystals of quartz or of calc-spar, and contains layers of chert of a milky colour. Narrative of a Second Expedition to the Shores of the Polar Sea Flints are a form of silica, a purer form than chert, as the chalk in which they are embedded was formed in the deep sea, and so we have no admixture of sand. The Geological Story of the Isle of Wight A gradual passage from chert to limestone is not uncommon. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Radiolaria are found in cherts in the Culm of Devonshire and Cornwall, in Russia, Germany and elsewhere. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" Gray chert, fine large flaking, point polished from long use. American Antiquities Auction Catalogue, January 8, 1898 2011-02-23T03:00:33.300Z The chert has sometimes the appearance of calcedony, and is finely striped. Narrative of a Second Expedition to the Shores of the Polar Sea Gravel pits show upwards of 30 feet of gravel, consisting of flints with some chert and ironstone, and the greatest thickness is probably considerably more than this. The Geological Story of the Isle of Wight In the Cambrian limestones, as in their more 87 recent analogues, layers and nodules of chert and phosphatized material are not wanting. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" The beds of chert are utilized in the pottery industry, and some of the harder and more crystalline limestones are beautiful marbles, capable of taking a high polish. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" White flint and chert, all fine, average 4½ in. long. American Antiquities Auction Catalogue, January 8, 1898 2011-02-23T03:00:33.300Z It sometimes passes into milk-white chert, which forms beds. Narrative of a Second Expedition to the Shores of the Polar Sea At Little Stairs a gravel, largely of angular chert, reaches a thickness of 12 feet, and in parts are several feet of loam above gravel. The Geological Story of the Isle of Wight In the limestone was found the flint or chert used for weapons and instruments in early times. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1 "Edwardes" to "Ehrenbreitstein" Lower Cretaceous limestones and schists, with radiolarian cherts, arc extensively developed; and in many parts of the island Upper Cretaceous limestones with Rudistes and Eocene beds with nummulites have been found. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" White chert, long, square base, as No. 96, beautifully made. American Antiquities Auction Catalogue, January 8, 1898 2011-02-23T03:00:33.300Z In contact with the greenstone, there is a bed of talcose limestone, having a curved, slaty structure; most of the beds of dolomite are hard, and pass into chert. Narrative of a Second Expedition to the Shores of the Polar Sea Perhaps the finest piece of the Upper Greensand is Gore Cliff above Niton lighthouse, a great vertical wall with the cornice of dark chert strata overhanging at the top. The Geological Story of the Isle of Wight Another very important series of concretionary structures are the flint nodules which occur in chalk, and the patches and bands of chert which are found in limestones. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" The rest is paved with granite blocks, chert and macadam. Atlanta A Twentieth-Century City White chert, with haft for a handle, flaked and chipped, extremely rare form. American Antiquities Auction Catalogue, January 8, 1898 2011-02-23T03:00:33.300Z Beds and nodules of chert are abundant in the upper parts of the limestone; at Bakewell it is quarried for use in the Potteries. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 2 "Demijohn" to "Destructor" In numerous walls in the south of the Island may be seen stone from the various strata—sandstone, blue limestone or rag, and also the chert. The Geological Story of the Isle of Wight Corals and other fossils frequently occur in chert, and when sliced and microscopically examined both flint and chert often show silicified foraminifera, polyzoa &c., and sponge spicules. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" This is connected north of the city with a macadam pike to Buckhead, and south of the city with a chert road to College Park, six miles beyond the city limits. Atlanta A Twentieth-Century City Grey chert, of different forms, all perfect and very fine. American Antiquities Auction Catalogue, January 8, 1898 2011-02-23T03:00:33.300Z Large numbers of their implements made of quartz, chert, bone, and slate for the household and for the hunt have been found. History of Human Society And now we come to a new material, chert. The Geological Story of the Isle of Wight Kinds of Rocks Used for Macadam.—Limestone and chert are the two sedimentary rocks, employed most extensively for broken stone roads. American Rural Highways Limestones lose their calcium carbonate by solution, leaving only clay with fragments of quartz or chert as impurities. The Economic Aspect of Geology They are often altered into a kind of chert. British Borneo Sketches of Brunai, Sarawak, Labuan, and North Borneo The variety of their strata make the cliffs interesting to geologists, for here are found layers of different kinds of chalk, limestone, greensand, marls, chert, and interspersed lines of flints. Devon, Its Moorlands, Streams and Coasts Now, much of the chert is full of needles, or spicules, as they are called, of sponges, and this points to the source from which some at least of the silica was derived. The Geological Story of the Isle of Wight Relics are very abundant here, especially the small chert "thumb-scrapers," which outnumber all other specimens. Archeological Investigations Bureau of American Ethnology, Bulletin 76 Tripoli and rottenstone are light, porous, siliceous rocks which have resulted from the leaching of calcareous materials from various siliceous limestones or calcareous cherts in the process of weathering. The Economic Aspect of Geology Billy had showed David how to knap flint and chert the week before, after seeing a filmstrip about it in class. Someone Comes to Town, Someone Leaves Town The chert decomposes deeply, and assumes a rough brown granular surface, deeply worn and furrowed. The Poetry of Architecture Or, the Architecture of the Nations of Europe Considered in its Association with Natural Scenery and National Character To form the chert much of the silica has been in some manner dissolved, and deposited again in the interstices of sandstone strata. The Geological Story of the Isle of Wight There is no chert or similar material from which chipped implements can be made; nor, as would naturally be expected, is there any obsidian suitable for such manufacture. Archeological Investigations Bureau of American Ethnology, Bulletin 76 Some of the lead and zinc deposits of the Mississippi Valley outcrop at the grass roots as varying mixtures of iron oxide, galena, chert, and clay, though they seldom project above the general surface. The Economic Aspect of Geology Billy rushed home from his grade-two class, eyes crazed with precognition, and found David methodically wringing the animals’ necks and then slicing them open with a bit of sharpened chert. Someone Comes to Town, Someone Leaves Town Further up this creek in a wild and secluded spot, observed a Natural Bridge with six feet of this chert bed at its base, and Silicious Magnesian Limestone above. Cave Regions of the Ozarks and Black Hills Sometimes this black flint passes into chert and chalcedony of blue and purple tints. In Indian Mexico (1908) It has a small, low entrance, nearly closed by a pile of chert gravel mixed with some clay, which has been carried by surface water from the slope above. Archeological Investigations Bureau of American Ethnology, Bulletin 76 They are variously associated with a gangue of dolomite, calcite, quartz, iron pyrite, barite, and chert. The Economic Aspect of Geology He’d expected the finger to crush into powder, but instead it fissured into three jagged pieces, like a piece of chert fracturing under a hammer-stone. Someone Comes to Town, Someone Leaves Town Characteristics: flint, chert, obsidian, green and red jasper, and quartz–crystal flakes, arrowheads, cores, and saw–blades. How to Observe in Archaeology In the opposite bank of the river I found several thin strata of compact chert containing probably fragments of corallines, not only on the surface but embedded in the limestone. Three Expeditions into the Interior of Eastern Australia, Volume 2 There was considerable chert gravel mixed with the clay, making excavation as difficult and laborious as digging up an old, much-traveled macadamized highway. Archeological Investigations Bureau of American Ethnology, Bulletin 76 It is the chief ingredient of sand, sandstone, quartzite, chert, diatomaceous earth, and tripoli. The Economic Aspect of Geology It may be worth while to compare the natural history of this part of the earth with the flint and chert found in our chalk and lime-stone countries. Theory of the Earth, Volume 1 (of 4) Between these arms are laid loose blocks of chert, which are moved round on the bed-stone as the arms revolve, and thus grind the flint with water to the consistence of cream. The Mirror of Literature, Amusement, and Instruction Volume 19, No. 550, June 2, 1832 Some of our men used to go as far as Little River for chert which they liked better for arrow-points than our own flints, being less brittle and more easily worked. The Trail Book Scarcely any chert was included, although it is abundant on the hill; the few pieces seen were very small. Archeological Investigations Bureau of American Ethnology, Bulletin 76 These are similar in composition to the leaner iron ores of Brazil, called itabirite, but differ in that the silica is in the form of chemically deposited chert, rather than fragmental quartz grains. The Economic Aspect of Geology Immediately at the entrance, and superimposed directly upon the granite, are strata of compact calcareous sandstone and chert, alternating with fine white and reddish-white, and fine gray and red sandstones. 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 In our wanderings, however, we picked up on Steamboat Point a beautiful red chert arrow-head, undoubtedly shot by an Indian at elk years before Columbus burst in upon these good people. Hunting with the Bow and Arrow In the same limestone there are enormous beds of chert, agates, and carnelians. Canyons of the Colorado Adz or gouge of chert from Miller's Cave 79 17. Archeological Investigations Bureau of American Ethnology, Bulletin 76 The arrow-heads of chert used for hunting are peculiarly fastened, in order to make the arrow revolve. My Native Land The United States: its Wonders, its Beauties, and its People; with Descriptive Notes, Character Sketches, Folk Lore, Traditions, Legends and History, for the Amusement of the Old and the Instruction of the Young We then traversed a very rocky country, at the southern base of the sandstone range, till 11.0, when we came to a more level and grassy country, consisting of chert ridges. Journals of Australian Explorations The loam, which covered the uneven bottom of the cave, was sparingly mixed with rounded fragments of chert, and was very similar in composition to that covering the general surface of that region. The Antiquity of Man At the western extremity of the Pyrenees, great curvatures of the strata are seen in the sea-cliffs, where the rocks consist of marl, grit, and chert. The Student's Elements of Geology "Gravel" in a cavern is seldom noticeably water-worn, but is the angular débris resulting from the continued fragmentation of chert nodules released by erosion of the limestone. Archeological Investigations Bureau of American Ethnology, Bulletin 76 It contains a very few pebbles of quartz, and occasionally layers of chalcedonic nodules, like those of chert in our Greensand. Volcanic Islands At 6.50 a.m. resumed a south-east course, traversing a broken country with limestone, chert, sandstone, and trap hills, deeply cut by dry watercourses. Journals of Australian Explorations One of these of clear, fine-grained pink and white chert, shown at b in plate 28, so far surpasses in delicate finish any other specimen secured that it is probably exotic. Archeological Investigations Bureau of American Ethnology, Bulletin 76 The stone below is whiter, and contains occasional nodules of grey chert or chalcedony. The Student's Elements of Geology The lower is a red or yellow clay containing much angular gravel such as usually results from disintegration of limestone in which chert is abundant. Archeological Investigations Bureau of American Ethnology, Bulletin 76 A foot farther in was part of a skiver; and 2 feet beyond this was a large knife of white chert almost as clear and compact as chalcedony, shown at a in plate 27. Archeological Investigations Bureau of American Ethnology, Bulletin 76 Sandstone is the prevailing rock, sometimes passing into jasper, and also into chert and coarse limestone. Journals of Australian Explorations Its surface is an exact cast of the interior of the cave which it filled, and nodules of chert, remaining when the limestone dissolved, are still imbedded in its surface. Archeological Investigations Bureau of American Ethnology, Bulletin 76 Thick beds of chert occur in the Middle Purbeck filled with mollusca and cyprides of the genera already enumerated, in a beautiful state of preservation, often converted into chalcedony. The Student's Elements of Geology It is made of gray chert, the edge highly polished. Archeological Investigations Bureau of American Ethnology, Bulletin 76 At Folkestone they contain layers of calcareous matter and chert, and at Hythe, in the neighbourhood, as also at Maidstone and other parts of Kent, the limestone called Kentish Rag is intercalated. The Student's Elements of Geology In the cliffs of the southern coast of the Isle of Wight it contains bands of calcareous limestone with nodules of chert. The Student's Elements of Geology We must imagine that many strata of limestone, chert, and other rocks which are now brittle, were pliant when bent into their present position. The Student's Elements of Geology |
| 随便看 |
英语例句辞典收录了117811条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。