 ordovician_period |
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| 1. | [ noun ] (geology) from 425 million to 500 million years ago; conodonts and ostracods and algae and seaweeds | |
| Synonyms: | Ordovician | |
| Related terms: | period Paleozoic | |
| ordovician_period |
||
| 1. | [ noun ] (geology) from 425 million to 500 million years ago; conodonts and ostracods and algae and seaweeds | |
| Synonyms: | Ordovician | |
| Related terms: | period Paleozoic | |
