| 单词 | Ordovician period |
| 例句 | Fossilized cells, cuticles, and spores of early land plants have been dated as far back as the Ordovician period in the early Paleozoic era. Fundamentals of Biology 2015-01-01T00:00:00Z The first bryophytes most probably appeared in the Ordovician period, about 490 million years ago. Concepts of Biology 2013-04-25T00:00:00Z But beautifully maintained animals are much rarer in the succeeding Ordovician period. 462-Million-Year-Old Fossil Trove Holds Miniature World of Marine Creatures 2023-05-10T04:00:00Z Mieridduryn lived during the Ordovician period, as Earth’s oceans were starting to resemble something a little more familiar to us today. Five-Eyed, Nozzle-Nosed Oddity Lingered Far beyond the Cambrian Period 2023-02-14T05:00:00Z Previous studies place the earliest cannibalism about 450 million years ago in the Late Ordovician period. Trilobite Fossils Suggest Cannibalism Is More Ancient Than Once Thought 2022-03-25T04:00:00Z Land plants appeared about 500 million years ago in the Ordovician period. Fundamentals of Biology 2015-01-01T00:00:00Z Helpful summaries break down what was going on at different stages, such as the Late Ordovician period 450 million years ago, when the first coral reefs emerged. Ancient Earth Globe lets you travel back in time for a look at the planet 2018-03-23T04:00:00Z The island chain sits on top of the Trenton Group, a formation of rocks that date back to the Ordovician period. Trilobites are the Legos of the Ordovician seas 2016-07-10T04:00:00Z This new species, living some 40 million years later in the early Ordovician period, was probably among the last of its kind. 'Giant lobster' ate like a whale 2015-03-12T04:00:00Z In addition, the creature dates back to the Ordovician period, a time of intense biodiversification that followed the Cambrian, meaning these animals existed for 30 million years longer than previously realized. Scientists Discover Fossil of Giant Ancient Sea Predator 2011-05-27T14:52:00Z During the Ordovician period, which followed the Cambrian period, plant life first appeared on land. Fundamentals of Biology 2015-01-01T00:00:00Z Now a newly discovered specimen indicates that they actually lived another 30 million years, into the Early Ordovician period. Observatory: Fossil Extends Life Span of a Marine Predator 2011-05-25T17:50:03Z The transition between the Cambrian and the Ordovician periods is crucial in evolutionary history. Fossils resolve extinction puzzle 2010-05-13T08:10:00Z Little is known of the early geological history of Asia beyond the fact that a large part of the continent was covered by the sea during the Cambrian and Ordovician periods. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" The specimens are just part of a new trove of fossils from Morocco that includes thousands of examples of soft-bodied marine fauna dating back to the early Ordovician period, 488 to 472 million years ago. Scientists Discover Fossil of Giant Ancient Sea Predator 2011-05-27T14:52:00Z 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 The Ordovician period was marked by abundant representation of the once very successful class of Trilobites—jointed-footed, antenna-bearing, segmented marine animals, with numerous appendages and a covering of chitin. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told Because hard shells fossilize and are preserved more readily than soft tissue, scientists had an incomplete and biased view of the marine life that existed during the Ordovician period before the recent discoveries in Morocco. Scientists Discover Fossil of Giant Ancient Sea Predator 2011-05-27T14:52:00Z |
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