共查询到20条相似文献,搜索用时 31 毫秒
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E. Zindler-Frank 《当今生物学》1973,3(1):31-31
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Volker Storch 《当今生物学》2010,40(5):352-352
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Peter Rothe Professor Dr. 《当今生物学》2008,38(5):330-337
Ordovician and Silurian sediments are predominantly black shales formed from anoxic pelagic environments. Adjacent shallow marine areas are represented by reefs and well‐sorted sands deposited worldwide on continental shelves. Pelagic realms hosted a great variety of graptolite colonies which due to their rapid evolution are excellent index fossils besides a multitude of new species of trilobites and brachiopods. Reef builders were mainly bryozoans and tabulate corals. During the Ordovician, the earliest spores mark the beginning conquest of land by plants. A mass extinction at the end of the Ordovician was probably caused by a worldwide climatic change which is also evident from traces of a contemporaneous glaciation. 相似文献
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Nicolaus Peters Jun 《International Review of Hydrobiology》1969,54(1):183-184
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T. Postelnicu 《Biometrical journal. Biometrische Zeitschrift》1986,28(5):600-600
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