Of, relating to, or designating the second period of the Palaeozoic era, which occurred between about 510 million and 439 million years ago…
| 单词 | θ5410 |
| 释义 | the world > the earth > structure of the earth > age or period > [adjective] > primary or Palaeozoic > Ordovician (3) Ordovician1879 Of, relating to, or designating the second period of the Palaeozoic era, which occurred between about 510 million and 439 million years ago… Cincinnatian1899 Of or belonging to the town of Cincinnati in Ohio; spec. in Geology designating a series of rocks in eastern North America of the Upper Ordovician… Caradocian1910 |
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