| 单词 | Ordovician period |
| 释义 | Ordovician period (once / 1477414 pages) n WORD FAMILY Ordovician period: Ordovician periods USAGE EXAMPLESThe island chain sits on top of the Trenton Group, a formation of rocks that date back to the Ordovician period. The Verge(Jul 10, 2016) This new species, living some 40 million years later in the early Ordovician period, was probably among the last of its kind. BBC(Mar 12, 2015) In the time of the Aegirocassis benmoulae, during the the Ordovician period, plankton ecosystems were changing and many new species of plankton were popping up. The Verge(Mar 11, 2015) n from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds Syn|Exp Ordovician geological period, period a unit of geological time during which a system of rocks formed |
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