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Arikareean  

Definición

  • The Arikareean is an Upper Oligocene North American Stage on the geologic timescale according to the North American Land Mammal Ages chronology (NALMA), typically set from 30,600,000 to 20,800,000 years BP, a period of 9.8 million years. The Arikareean is preceded by the Whitneyan and followed by the Hemingfordian NALMA stages. (Adapted from: https://en.wikipedia.org/wiki/Arikareean)

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http://data.loterre.fr/ark:/67375/QX8-BRVRW6XP-3

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