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ordovician period (0 synonym found)
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Definition of ordovician period:
(n) :
from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
Definition of ordovician period:
(n) :
from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
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