Ordovician

(Pronunciation -تلفظ سنیۓ ) US:

Slow

Normal

Noun: Ordovician

1. Ordovician [ Synonyms: ordovician period]
From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds

Ordovician is a part of:

paleozoic, paleozoic era

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