| ordovician | <geology> Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian. The Ordovician formation. Origin: From L. Ordovices, a Celtic people in Wales. Source: Websters Dictionary (01 Mar 1998) |
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| ordovician | from 425 million to 500 million years ago |
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| ordovician | from 425 million to 500 million years ago |
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