The Riochican age is a period of geologic time (57.0—54.0 Ma) within the Paleocene epoch of the Paleogene used more specifically with South American Land Mammal Ages. It follows the Itaboraian and precedes the Casamayoran age.[1]
Paleogene Period | ||
---|---|---|
Paleocene Epoch | Eocene Epoch | Oligocene Epoch |
Danian | Selandian Thanetian |
Ypresian | Lutetian Bartonian | Priabonian |
Rupelian | Chattian |