Duchesnean
The Duchesnean North American Stage on the geologic timescale is a North [American Land Mammal Ages|North American Land Mammal Age (NALMA)], with an age from 42,000,000 to 38,000,000 years before present BP, representing. It cascade inside the Eocene era. The Duchesnean is preceded by the Uintan and followed by the Chadronian NALMA.
The Duchesnean cataract inside the Bartonian age of the geologic timescale.