From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
Noun
from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
a.
Of or pertaining to a division of the Silurian
formation, corresponding in general to the Lower Silurian of most
authors, exclusive of the Cambrian.
n.
The Ordovician formation.
Ordovician
Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
Usage Examples
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