| 词汇 | ordovician |
| 释义 | Ordovician adjective geology specializeduk /ˌɔː.dəˈvɪʃ.ən/ us /ˌɔːr.dəˈvɪʃ.ən/ from or referring to the period of time between about 485 and 445 million years ago, in which there were many different types of animals in the sea, including vertebrates (= animals with backbones), but no life on land: 奥陶纪的（距今约4亿8千5百万年至4亿4千5百万年前间，此时水中已有许多动物包括脊椎动物，但是陆地上还没有动物） For his PhD he mapped Welsh Ordovician rocks and described new species of fossils. In mid Ordovician times a volcanic island arc is thought to have extended through the English Lake District, Wales and Newfoundland. As time passed there was a possible lowering of local temperatures in the succeeding Ordovician period. The same unfortunately isn't the case for the very brief late Ordovician cold spell. An early Ordovician trench is thought to have extended from just north of the Southern Uplands of Scotland down across northern Ireland. Geology - general words aeolian Anthropocene anticline apophysis auriferous biozone carboniferous continental plate geologically geomorphic gully erosion henge Holocene petrographic petrographically petrography petrological petrologically Precambrian rockfall You can also find related words, phrases, and synonyms in the topics: Prehistory Specific periods of time Ordovician noun[ S ] geology specializeduk /ˌɔː.dəˈvɪʃ.ən/ us /ˌɔːr.dəˈvɪʃ.ən/ the Ordovician the period of time between about 485 and 445 million years ago, in which there were many different types of animals in the sea, including vertebrates (= animals with backbones), but no life on land: This first happened early in the Ordovician. As the Ordovician progressed, the separation between the two continents decreased and they both acquired warm environments. At Builth in Central Wales, a complicated history has been worked out for one part of the Ordovician. Extensive volcanism occurred during the Ordovician in the Lake District and Wales. In the late Ordovician , these strata were intruded by dolerite sills and stocks. Geology - general words aeolian Anthropocene anticline apophysis auriferous biozone carboniferous continental plate geologically geomorphic gully erosion henge Holocene petrographic petrographically petrography petrological petrologically Precambrian rockfall You can also find related words, phrases, and synonyms in the topics: Prehistory Specific periods of time |
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