| 单词 | Cambrian period |
| 例句 | Although he might lose some gourmands on his trek through the Cambrian period, McQuaid picks them back up when relatives of Homo sapiens have their first communal cookout. Taste preference is the subject of a new book by a Silver Spring writer 2015-01-25T05:00:00Z "This discovery helps fit that final piece in and complete our picture of how much animal diversity was already existing in the Cambrian period." Researchers announce Pacman ghost-shaped jellyfish is the oldest in fossil record 2023-08-02T04:00:00Z Most fossils from before the Cambrian period are either microscopic or little more than faint imprints, making it difficult to infer how these ancestral jellies lived. 505-Million-Year-Old Jellyfish Fossils May Be the Oldest Ever Found 2023-08-01T04:00:00Z The morphological flexibility and complexity of animal development afforded by the evolution of Hox control genes may have provided the necessary opportunities for increases in possible animal morphologies at the time of the Cambrian period. Fundamentals of Biology 2015-01-01T00:00:00Z Between 540 million and 485 million years ago, during the Cambrian period, so many new, complex animal life forms arose that paleontologists speak of the Cambrian Explosion or the Biological Big Bang. Fossil-rich Welsh quarry yields trove of soft-bodied animals at dawn of modern life 2023-05-01T04:00:00Z Scientists uncovered something unexpected in the fossilized embryo of a worm-like creature from the Cambrian period: the remains of a tiny, doughnut-shaped brain in the primordial animal’s head. Penis Worm’s Ancient Cousin Fossilized with Its Doughnut-Shaped Brain Intact 2022-10-05T04:00:00Z Some of these life forms have survived to today, and some were “experimental” whose lineage did not continue past the Cambrian period. An Introduction to Geology 2017-01-01T00:00:00Z “It really adds to the compelling body of evidence indicating that medusozoans, which are a really important clade in the oceans today, were already established by the time of the Cambrian period,” Dr. Lieberman said. 505-Million-Year-Old Jellyfish Fossils May Be the Oldest Ever Found 2023-08-01T04:00:00Z However, unresolved questions about the animal diversification that took place during the Cambrian period remain. Fundamentals of Biology 2015-01-01T00:00:00Z But the quarry also holds strange creatures thought to have arisen and vanished during the Cambrian period, such as opabiniids, which had five eyes and a long proboscis, and scaly slugs called wiwaxiids. Fossil-rich Welsh quarry yields trove of soft-bodied animals at dawn of modern life 2023-05-01T04:00:00Z It was not until the evolutionary burst that occurred in the Cambrian period, between 541 million and 485.4 million years ago, that animals acquired some basic sound-making behaviors related to locomotion and predation. Fossils Reveal When Animals Started Making Noise 2022-01-10T05:00:00Z The bizarre menagerie that originated in the Cambrian period, some 541 million years ago, provides a glimpse into the limitless world of potential variations on animal form. Review | With failed experiments and bizarre successes, evolution marches on 2021-12-09T05:00:00Z But Dr. Caron and other scientists recently described a cache of jellyfish fossils from the Cambrian period that found an improbable pathway to preservation. 505-Million-Year-Old Jellyfish Fossils May Be the Oldest Ever Found 2023-08-01T04:00:00Z During the Ordovician period, which followed the Cambrian period, plant life first appeared on land. Fundamentals of Biology 2015-01-01T00:00:00Z Priapulan worms appeared more than 500 million years ago during the Cambrian period, when animal life evolved rapidly in sophistication, complexity and size. These Oddly Named Worms May Have Been the First Hermits 2021-11-08T05:00:00Z The oldest undisputed fossils date back to the Cambrian period when animals first developed hard skeletons, exoskeletons and shells, which were more likely to be preserved. 890-million-year-old fossils may be oldest sign of animal life on Earth, Canadian geologist says 2021-07-29T04:00:00Z He describes the shallow oceans of the early Cambrian period, for example, as being “filled with the spiky clatter of arthropod pincers.” Review | With failed experiments and bizarre successes, evolution marches on 2021-12-09T05:00:00Z Until now, the oldest undisputed fossil sponges date to around 540 million years ago, an era called the Cambrian period. Oldest fossils of animals may be in Canada rocks, study says 2021-07-28T04:00:00Z It starts with the Cambrian period, followed by the Ordovician, Silurian, Devonian, Carboniferous, and Permian. Fundamentals of Biology 2015-01-01T00:00:00Z Recent discoveries in Siberia, Namibia and other places are now showing that complex animals actually got their start millions of years before the Cambrian period. Understanding through Time: Early Life, Climate and Vaccines 2019-05-14T04:00:00Z The fossils are from the Cambrian period, which began 541 million years ago and saw a rapid increase in animal diversity on Earth. Huge fossil discovery made in China 2019-03-24T04:00:00Z The Proterozoic—the geologic eon that preceded the Cambrian period and spanned the time from the appearance of oxygen in Earth’s atmosphere to the emergence of complex life—is itself nearly two billion years long. Did Crawling Critters Leave These Cracks? The Answer Could Rewrite Evolutionary History 2019-02-26T05:00:00Z Fossil evidence is scant before the Cambrian period when animals first developed hard skeletons, exoskeletons and shells, which are more likely to be preserved. Oldest fossils of animals may be in Canada rocks, study says 2021-07-28T04:00:00Z While animal diversity increased during the Cambrian period of the Paleozoic era, 530 million years ago, modern fossil evidence suggests that primitive animal species existed much earlier. Fundamentals of Biology 2015-01-01T00:00:00Z All the analyses indicate that land plants first appeared about 500 million years ago, during the Cambrian period, when the development of multi-cellular animal species took off. Land plants arose earlier than thought—and may have had a bigger impact on the evolution of animals 2018-02-19T05:00:00Z Then suddenly, at least in geologic terms, the majority of animal phyla developed in the Cambrian period, and some seem to have been vertebrates. ‘Other Minds’: Diving deep into the world of the octopus 2016-12-02T05:00:00Z These burrows were made by underwater animals that lived on the shores of what is now western Maryland about 530 million years ago, during the Cambrian period. Here’s how to find D.C.’s accidental museum of paleontology 2016-08-18T04:00:00Z During the Cambrian period, they slashed their way through the sea, using pincers and clawlike appendages to tear apart their prey before shoving it into their mouths. 'Mother Lode' of Fossils Discovered in Canada 2014-02-11T22:08:00Z Furthermore, the vast diversification of animal species that appears to have begun during the Cambrian period continued well into the following Ordovician period. Fundamentals of Biology 2015-01-01T00:00:00Z What we've been working with is fossils with very fine anatomical preservation from the Cambrian period. Clawed fossil had spider-like brain 2013-10-16T17:33:26Z The earliest animals first appeared in the fossil record about 200 million years before the Cambrian period, but fossil and molecular evidence indicate meat-eating didn't show up until the Cambrian. Oxygen Brought Earliest Carnivores to Life 2013-08-01T20:45:02.507Z The geological record speaks of four others since animal life became complex at the beginning of the Cambrian period 541m years ago. Mass extinctions: Small but deadly 2013-07-25T14:59:45Z But two centuries after it was noticed, in the mountains of Wales after which the Cambrian period is named, nobody knows what detonated it. The Cambrian explosion: Kingdom come 2013-03-21T16:02:17Z Despite some of these arguments, most scientists agree that the Cambrian period marked a time of impressively rapid animal evolution and diversification that is unmatched elsewhere during history. Fundamentals of Biology 2015-01-01T00:00:00Z However this reinterpretation of Cotyledion tylodes as an entoproct places the fossil record of this group in the earlier Cambrian period. Ancient sea creature's secrets 2013-01-17T14:07:27Z The plan is to inject the captured CO2 into sandstone dating back to the Cambrian period, for at least 25 years. Critical Carbon Capture Technology Stalled 2012-10-16T16:15:00.897Z The fossil record dates the ancestors of the nautilus to the late Cambrian period, 500 million years ago. Too Much Love Threatens Chambered Nautilus, Scientists Say 2011-10-24T14:59:17Z We speak of the Cretaceous, Jurassic, and Cambrian periods, and of the Cretaceous fauna, the Jurassic flora, the Cambrian trilobites, as if these adjectives denoted simply epochs of geological time. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Recall that the “Cambrian explosion” is the name given to a relatively brief span of time during the Cambrian period during which many animal groups appeared and rapidly diversified. Fundamentals of Biology 2015-01-01T00:00:00Z The animals, known as anomalocaridids, were thought to have gone extinct after the Cambrian period, 540 million to 500 million years ago. Observatory: Fossil Extends Life Span of a Marine Predator 2011-05-25T17:50:03Z Scientists once thought they were all wiped out 488 million years ago, along with many other bizarre creatures, in a mass extinction that ended the Cambrian period. Who You Callin' Shrimp? 2011-05-25T18:30:08Z M�ller’s opinion, their separation into the families now living may have already taken place in the Cambrian period. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z From the Cambrian period all through Palaeozoic times there rose at intervals in that country a succession of volcanic centres from some of which thousands of feet of lavas and tuffs were discharged. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Most familiar fossils appeared in the Cambrian period more than 540 million years ago. Gene Genesis 2010-12-21T16:14:00Z Dr. Briggs figured prominently in “Wonderful Life: The Burgess Shale and the Nature of History,” the 1989 book by Stephen Jay Gould about what the author called the “weird wonders” of the Cambrian period. Fossil Trove Shows Diverse Creatures of Cambrian Did Not Disappear 2010-05-17T21:58:00Z The creatures, he explained, closely matched those found in the Burgess Shale of British Columbia, a locality famous for yielding rare fossils of soft-bodied marine creatures from the Middle Cambrian period. Fossils resolve extinction puzzle 2010-05-13T08:10:00Z They were very common in the very ancient seas of the Cambrian period,—the period of the most ancient fossils yet found,—and some, the Lingulæ, have lived on almost unchanged to the present day. The Geological Story of the Isle of Wight In the Cambrian period trilobites had already attained their maximum size; some species of Paradoxides were nearly 2 ft. long, but in company with these monsters were tiny forms like Agnostus and Microdiscus. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" In this reckoning it should be noted that no account is taken of those great intervals of unrecorded time, such as elapsed between the close of the Laurentian and the beginning of the Cambrian periods. Outlines of the Earth's History A Popular Study in Physiography It is all included in the Cambrian period and consists of limestone, shale, sandstone and conglomerate. History and Comprehensive Description of Loudoun County, Virginia The animals of the Cambrian period are almost all small mollusks, star-fishes, sponges, and other simple, primitive types of life. Falling in Love With Other Essays on More Exact Branches of Science It is, however, interesting to note that, with this exception, almost all the other leading groups of Invertebrates are known to have come into existence during the Cambrian period. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science References.—The literature devoted to the Cambrian period is very voluminous, important contributions having been made by A. Sedgwick, Sir R.I. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" Below the plateau, slight slopes lead the eye to the last of the stratified rocks, the Tonto sandstones of the Cambrian period. The Grand Canyon of Arizona; how to see it The story of the earth from the beginning of the Cambrian period to the present day was long ago divided by geologists into four great eras. The Story of Evolution Any attempt to picture the geographical conditions of the Cambrian period must of necessity be very imperfect. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" |
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