Ordovician
volume
British pronunciation/ˌɔːdəvˈɪʃən/
American pronunciation/ˌɔːɹdəvˈɪʃən/

"ordovician" 的定义和意义

Ordovician
01

from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds

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