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Definition of Ordovician period
1. Noun. From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds.
Exact synonyms: Ordovician
Group relationships: Paleozoic, Paleozoic Era
Generic synonyms: Geological Period, Period
Group relationships: Paleozoic, Paleozoic Era
Generic synonyms: Geological Period, Period
Lexicographical Neighbors of Ordovician Period
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