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Chadronian  

Definition

  • The Chadronian age within the North American Land Mammal Ages chronology is a lower Oligocene continental North American faunal stage typically set from 38,000,000 to 33,900,000 years BP, a period of 4.1 million years ; from Chadron (Nebraska). The Chadronian is preceded by the Duchesnean and followed by the Orellan NALMA stages. (Adapted from: https://en.wikipedia.org/wiki/Chadronian)

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http://data.loterre.fr/ark:/67375/QX8-JHXMRX1R-G

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