The Hemphillian 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 10,300,000 to 4,900,000 years BP. It is usually considered to overlap the Tortonian epoch of the Late Miocene and Zanclean epoch of the Early Pliocene. The Hemphillian is preceded by the Clarendonian and followed by the Blancan NALMA stages. The Hemphillian can be further divided into the substages of: