Clarkforkian

The Clarkforkian North American Stage, on the geologic timescale, is the last North American faunal stage of the Paleocene epoch within the North American Land Mammal Ages chronology (NALMA). It spans an interval from around 57,500,000 to 56,000,000 years Before Present.

The Clarkforkian corresponds to part of the Late Paleocene (Thanetian stage on global timescales). The Paleocene-Eocene boundary and Paleocene-Eocene thermal maximum occur close to the end of the Clarkforkian. The Clarkforkian is preceded by the Tiffanian and followed by the Wasatchian NALMA stages.