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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
Geological time spiral

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