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1. Clarkforkian: The Clarkforkian North American Stage, on the geologic timescale, is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 56,800,000 to 55,400,000 years BP lasting 1.4 ... (Earth) [100%] 2023-12-06 [Clarkforkian] [Paleocene life]...