| 单词 | microfossil |
| 例句 | Moving through deep time, he takes the reader into the microscopic realm of minerals and microfossils before venturing into a far future in which the pebble's atoms are reabsorbed into a new star system. The Planet in a Pebble by Jan Zalasiewicz – review 2012-06-12T11:30:03Z When compared to modern organisms, the microfossils more closely resembled a type of algae than simpler prokaryotic life -- organisms like bacteria, for example -- that existed prior to the Great Oxidation Event, the scientists said. Window to the past: New microfossils suggest earlier rise in complex life 2023-11-07T05:00:00Z The new discovery will prompt a re-think on other early microfossils. Bizarre new fossils shed light on ancient plankton 2023-10-25T04:00:00Z A separate mission in the 2030s will bring those rocks to Earth to analyse them for potential microfossils of simple life forms that are now long gone. Why finding alien life in Universe is now 'only a matter of time' 2023-09-29T04:00:00Z Conceivably, there is still cryptic life on Mars, although astrobiologists would be thrilled to find even a microfossil of something that lived billions of years ago. Strange DNA found in the desert offers lessons in the hunt for Mars life 2023-02-21T05:00:00Z In 1996, scientists proposed that they had found a microfossil in a Martian meteorite. We Regret the Fossil Error. It Wasn’t the First. 2023-02-21T05:00:00Z More work is required to determine if the microfossils were left behind by eukaryotic organisms, but the possibility would have significant implications, the scientists said. Window to the past: New microfossils suggest earlier rise in complex life 2023-11-07T05:00:00Z Back at their lab at Peking University, Dong and his colleagues carefully dissolved this limestone rock with acid and then manually sorted through the microfossils in the residue. Penis Worm’s Ancient Cousin Fossilized with Its Doughnut-Shaped Brain Intact 2022-10-05T04:00:00Z Some of the best fossils for biostratigraphic correlation are microfossils, most of which came from single-celled organisms. An Introduction to Geology 2017-01-01T00:00:00Z As expected, our analyses of the microfossils showed that abundances of plant spores and pollen dropped off precisely at the top of the last Permian coal deposit, reflecting near-total deforestation of the landscape. Toxic Slime Contributed to Earth’s Worst Mass Extinction—And It’s Making a Comeback 2022-07-06T04:00:00Z More muddled data about life on Mars arrived in 1996, when scientists discovered what could have been microbial microfossils inside a Martian meteorite found in Antarctica. Life Is Complicated—Literally, Astrobiologists Say 2021-11-23T05:00:00Z It would push back the known eukaryotic microfossil record by 750 million years. Window to the past: New microfossils suggest earlier rise in complex life 2023-11-07T05:00:00Z Stretching such extrapolations beyond Earth—as in the now infamous case of putative microfossils in a Martian meteorite—is a shaky prospect indeed. NASA’s Perseverance Mars Rover Grabs First Rock for Return to Earth 2021-08-06T04:00:00Z Conodonts are another example of microfossils useful for biostratigraphic correlation of the Cambrian through Triassic Periods. An Introduction to Geology 2017-01-01T00:00:00Z It also triggered the widespread microbial blooms we detected in our microfossil studies: the slime revolution had begun. Toxic Slime Contributed to Earth’s Worst Mass Extinction—And It’s Making a Comeback 2022-07-06T04:00:00Z But subsequent studies showed the putative microfossils could have easily been produced by several other entirely abiotic routes. Life Is Complicated—Literally, Astrobiologists Say 2021-11-23T05:00:00Z "The microfossils have a remarkable similarity to a modern family called Volvocaceae," Barlow said. Window to the past: New microfossils suggest earlier rise in complex life 2023-11-07T05:00:00Z The haul was taken back to the lab, where scores of students and volunteers combed through it one tablespoon at a time under microscopes, checking for tiny shards of bones and teeth called microfossils. Tiny Fossils From Alaska Reveal Dinosaur Life in the Arctic 2021-06-24T04:00:00Z In sediment cores, different species of microfossils are found in different layers. An Introduction to Geology 2017-01-01T00:00:00Z It described some microfossils from the early Jurassic, including arm plates of a fossilized brittle star with the very same snouted openings. These Brittle Stars Have Thousands of ‘Pig Snouts’ on Each Arm 2021-06-16T04:00:00Z The discovery didn’t really pan out—further studies, reported with considerably less fanfare, suggested the “microfossils” could just as well have been entirely abiotic mineral formations. Is NASA about to Lift the ‘Venus Curse?’ 2021-06-02T04:00:00Z The scientists analyzed the chemical makeup and carbon isotopic composition of the microfossils and determined the carbon was created by living organisms, confirming that the structures were indeed biologic fossils. Window to the past: New microfossils suggest earlier rise in complex life 2023-11-07T05:00:00Z The team found microfossils from at least seven different late Cretaceous dinosaur species, including tyrannosaurs, ridge-headed ceratopsians and duck-billed hadrosaurs. Tiny Fossils From Alaska Reveal Dinosaur Life in the Arctic 2021-06-24T04:00:00Z Micrite, also known as microscopic calcite mud, is a very fine-grained limestone containing microfossils that can only be seen using a microscope. An Introduction to Geology 2017-01-01T00:00:00Z The Mars rock generated tremendous media attention, but the microfossils discovery did not age well. NASA rover Perseverance will prowl ancient lake bed on Mars for signs of life 2020-07-27T04:00:00Z The concentration of the PAHs within the globules, the magnetite —produced when bacteria consume sulfur — and the presence of the microfossils suggested something stronger than unusual forms of carbon. We may have found life on Mars 24 years ago 2020-06-13T04:00:00Z Barlow compared the samples to microfossils from before the Great Oxidation Event and could not find comparable organisms. Window to the past: New microfossils suggest earlier rise in complex life 2023-11-07T05:00:00Z On Earth, the oldest microfossils, with unambiguous evidence for cells that lived about 3.4 billion years ago, were discovered in the Strelley Pool Formation in Western Australia. The Moon as a Fishing Net for Extraterrestrial Life 2019-09-25T04:00:00Z However, the most reliable record for early life, the microfossil record, starts at 3.5 billion years ago. An Introduction to Geology 2017-01-01T00:00:00Z Unearthed by phosphate miners in southern China, the microfossils of the Doushantuo formation just predate -- or are the earliest known members of -- the Ediacaran biota, the first bizarre animal life. What the Heck Are These Fossils? 2019-05-26T04:00:00Z Or could it really be what it looked like: microfossils, the remnants of a once thriving microbiological colony on Mars? We may have found life on Mars 24 years ago 2020-06-13T04:00:00Z The microfossils she found were larger and featured more complex cellular arrangements, she said. Window to the past: New microfossils suggest earlier rise in complex life 2023-11-07T05:00:00Z It would be tantalizing to find microfossils of extraterrestrial forms of life on the moon. The Moon as a Fishing Net for Extraterrestrial Life 2019-09-25T04:00:00Z “These data do not show that these microfossils originally contained chitin.” Billion-year-old fossils set back evolution of earliest fungi 2019-05-21T04:00:00Z Scientists still debate many of the details, which are derived from the computer models, and from field studies of the debris layer, knowledge of extinction rates, fossils and microfossils, and many other clues. The Day the Dinosaurs Died 2019-03-29T04:00:00Z Two other types of microfossils had the same carbon ratios as microbes known as archaea that depend on methane as their energy source—and that played a pivotal role in the development of multicellular life. Life may have originated on Earth 4 billion years ago, study of controversial fossils suggests 2017-12-18T05:00:00Z Compared to modern organisms, Barlow said, the microfossils have explicit similarities with algal colonies, including in the shape, size and distribution of both the colony and individual cells and membranes around both cell and colony. Window to the past: New microfossils suggest earlier rise in complex life 2023-11-07T05:00:00Z "This process of looking for microfossils in their host rock might be the key to unlocking the mystery of many specimens." Prehistoric reptile's last meal revealed 2017-10-03T04:00:00Z Lomax and colleagues used another palaeontological technique to help to address this, by getting a small fragment of the rock analysed for microfossils. Smallest Ichthyosaurus ever found was squid-eating newborn, research reveals 2017-10-03T04:00:00Z The international research team spent 10 years collecting and analyzing sediment samples in order to find microfossils. Wind-Propelled Waters Drove Antarctic Melting for Millennia 2017-07-06T04:00:00Z Now, a comprehensive analysis of these microfossils suggests that these formations do indeed represent ancient microbes, ones potentially so complex that life on our planet must have originated some 500 million years earlier. Life may have originated on Earth 4 billion years ago, study of controversial fossils suggests 2017-12-18T05:00:00Z They argue that the haematite structures are similar to those produced by iron-oxidising bacteria today, as well as to microfossils found in younger rocks, hundreds of millions – rather than billions – of years old. Do the Quebec fossils prove that life begin much earlier than we thought? 2017-03-03T05:00:00Z Researchers at the University of Birmingham analysed a tiny section of rock around the skeleton for the presence of microfossils. Prehistoric reptile's last meal revealed 2017-10-03T04:00:00Z The straw-shaped “microfossils,” narrower than the width of a human hair and invisible to the naked eye, are believed to come from ancient microbes, according to a new study in the journal Nature. Newfound 3.77-billion-year-old fossils could be earliest evidence of life on Earth 2017-03-01T05:00:00Z “The microfossils’ structures in themselves are almost identical, very similar, to microfossils and micro-organisms we see in similar hydrothermal vent settings today,” said Dodd. World's oldest fossils found in Canada, say scientists 2017-03-01T05:00:00Z The ratio of a final type of microfossil indicated that this organism produced methane as part of its metabolism. Life may have originated on Earth 4 billion years ago, study of controversial fossils suggests 2017-12-18T05:00:00Z Some of those extinct organisms might be microfossils entombed in rock. NASA’s Bold Plan to Hunt for Fossils on Mars Readings of such plant "microfossils" also undercut the dependence on macro-botanical evidence like carbonised seeds and grains in traditional archaeology. Cooking the world's oldest known curry - BBC News 2016-06-21T04:00:00Z While examining the microfossils, Porter found circular wounds of various sizes. You May Owe Your Existence to Tiny Vampires 2016-06-09T04:00:00Z They used microfossils, studying the formations left in coral reefs and salt marshes to determine ancient sea levels. Seas Rose Faster in 20th Century Than in Previous 2,700 Years 2016-02-22T05:00:00Z But he is concerned that the microfossils may have been badly preserved. Life may have originated on Earth 4 billion years ago, study of controversial fossils suggests 2017-12-18T05:00:00Z The researchers dated the carbonate in the sand—which mostly came from marine microfossils from the ocean—and concluded it was around 10,000 years old. Scientists Debate Evidence of Ancient Megatsunami 2015-12-22T05:00:00Z In 1996, scientists at the Johnson Space Center in Houston, Texas, believed that they had found a rock from Mars which contained “microfossils” – that is, fossils caused by ancient Martian microbes. How do I … prove there’s life on Mars? 2015-10-02T04:00:00Z We are also trying to find correlations between the ages of big mammals and those of small mammals or other microfossils that are dredged up in the same sediment. Fishing for fossils in the North Sea 2015-09-22T04:00:00Z “Sometimes in prehistoric societies, individuals used their teeth as tools — biting plants, among other things. We can’t assume they were actually eating plants based on finding microfossils in teeth,” Sistiaga said. Scatological science: Oldest human poop fossils are no laughing matter Two types of microfossils had the same carbon ratio as modern bacteria that use light to make carbon compounds that fuel their activities—a primitive photosynthesis that did not involve oxygen. Life may have originated on Earth 4 billion years ago, study of controversial fossils suggests 2017-12-18T05:00:00Z Knauth, Horodyski and Ray Kenny, a student, spent three years traversing the dangerous steeps of the Beck Spring Dolomite and the Mescal Limestone gathering rocks that they hoped contained those microfossils. Death Valley's First Life Came by Land, Not by Sea 2014-04-28T20:40:00Z Bacterial microfossils are not very informative structures; little can be inferred from the imprint of a small sphere or rod. Archaebacteria: The Third Domain of Life Missed by Biologists for Decades 2013-01-01T00:45:00.170Z “We”re now making detailed comparisons with all other early microfossils, and we”re very optimistic for future finds,” says Professor Brasier. Oldest Fossils on Earth Discovered 2011-08-23T14:35:00Z “If these are valid, and if we discount the Schopf microfossils, these would be the oldest known, though not by much,” Dr. Buick said. Geological Team Lays Claim to Oldest Known Fossils 2011-08-21T19:55:59Z Rasmussen hopes there will follow-up work that analyzes more microfossils. Life may have originated on Earth 4 billion years ago, study of controversial fossils suggests 2017-12-18T05:00:00Z Even more telling are microfossils that Knauth and his colleagues have unearthed from ancient holes pocking the barren surface of the dolomite. Death Valley's First Life Came by Land, Not by Sea 2014-04-28T20:40:00Z The microfossils, which the researchers say are very clearly preserved and show precise cell-like structures, were found in a remote part of western Australia called Strelley Pool. Life on Mars? Fossil find shows it's possible 2011-08-21T17:01:36Z The microfossils were found in a remote part of Western Australia called Strelley Pool. Oldest Fossils on Earth Discovered 2011-08-23T14:35:00Z “This struggle to be the owner of the world’s oldest microfossils is really not the crux of the battle for understanding the early development of life anymore,” Dr. Buick said. Geological Team Lays Claim to Oldest Known Fossils 2011-08-21T19:55:59Z Other work pointing to microfossils in meteorites goes back decades. Dot Earth: NASA Scientist Sees Signs of Life in Meteorites 2011-03-05T21:13:39Z Taken together, the geochemical and microfossil findings support his theory that during the Precambrian eon, complex life forms evolved not only in the oceans, but also on land. Death Valley's First Life Came by Land, Not by Sea 2014-04-28T20:40:00Z But they also measured how often the heavy isotope of oxygen was bonded to the heavy isotope of carbon in the carbonate skeletons of the microfossils. How to Read a Prehistoric Thermometer 2011-01-27T21:05:13Z So any fossils in rocks from these planets and moons ought to look like these Australian microfossils and pass the same evidence tests. Oldest Fossils on Earth Discovered 2011-08-23T14:35:00Z Does that mean the new microfossils are the oldest known? Geological Team Lays Claim to Oldest Known Fossils 2011-08-21T19:55:59Z A separate breakthrough came as paleontologists peering at oil came to recognize a host of microfossils. Tracing Oil Reserves to Their Tiny Origins 2010-08-02T22:33:00Z Before he retires, Knauth would like to add microfossils from the cave to the body of evidence that supports his evolutionary model. Death Valley's First Life Came by Land, Not by Sea 2014-04-28T20:40:00Z The traditional technique involves measuring two isotopes of oxygen—one heavier than the other—preserved in marine microfossils. How to Read a Prehistoric Thermometer 2011-01-27T21:05:13Z 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 The new microfossils are described in Sunday’s issue of Nature Geoscience by a team led by David Wacey of the University of Western Australia and Martin D. Brasier of the University of Oxford. Geological Team Lays Claim to Oldest Known Fossils 2011-08-21T19:55:59Z Over time, their desert wanderings produced a veritable zoo of microfossils. Death Valley's First Life Came by Land, Not by Sea 2014-04-28T20:40:00Z And where there are geochemical signs of life, there could also be microfossils. Death Valley's First Life Came by Land, Not by Sea 2014-04-28T20:40:00Z They look like well known but much newer microfossils from 2 billion years ago, and are not odd or strained in shape. Oldest Fossils on Earth Discovered 2011-08-23T14:35:00Z “But it would need these approaches—mapping the chemistry of any microfossils in fine detail and convincing three-dimensional images—to support any evidence for life on Mars.” Oldest Fossils on Earth Discovered 2011-08-23T14:35:00Z Crystals of fool’s gold, an iron-sulfur mineral, lie next to the microfossils and indicate that the organisms, in the absence of oxygen, fed off sulfur compounds, Dr. Brasier and his colleagues say. Geological Team Lays Claim to Oldest Known Fossils 2011-08-21T19:55:59Z The Nature Geoscience article published on Sunday does not claim discovery of the earth’s oldest microfossils. Geological Team Lays Claim to Oldest Known Fossils 2011-08-21T19:55:59Z The scientists discovered the cave while searching for microfossils to buttress their then-radical theory that microbial life flourished on land more than a billion years ago. Death Valley's First Life Came by Land, Not by Sea 2014-04-28T20:40:00Z Dr. Buick said there was no consensus on Dr. Schopf’s microfossils, but that “the majority opinion is that they are probably not biological and probably not as old as claimed.” Geological Team Lays Claim to Oldest Known Fossils 2011-08-21T19:55:59Z |
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