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The Riochican age is a period of geologic time (57.0—54.0 Ma) within the Paleocene and Eocene epochs of the Paleogene, used more specifically with South American Land Mammal Ages.

It follows the Itaboraian and precedes the Casamayoran age.[1]


Paleocene Eocene Oligocene

Preceded by Proterozoic Eon Phanerozoic Eon
Paleozoic Era Mesozoic Era Cenozoic Era
Cambrian Ordovician Silurian Devonian Carboniferous Permian Triassic Jurassic Cretaceous Paleogene Neogene 4ry