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Definisi 'ordovician'
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English to English adjective
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Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian. |  | source: webster1913 noun
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from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds | | source: wordnet30
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