The Rancholabrean 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 300,000 to 11,000 years BP. It is usually considered to overlap the Middle Pleistocene and Late Pleistocene epochs. The Ranchlabrean is preceded by the Irvingtonian NALMA stage. The Rancholabrean can be further divided into the substages of: * Sheridanian: Upper boundary source of the base of the Holocene (approximate)