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