TheArikareean North American Stage on thegeologic timescale is the North Americanfaunal stage according to theNorth American Land Mammal Ages chronology (NALMA), typically set from 30,600,000 to 20,800,000 yearsBP, a period of9.8 million years.^[1] It is usually considered to overlap theOligocene andMiocene epochs. The Arikareean is preceded by theWhitneyan and followed by theHemingfordian NALMA stages.

The Arikareean can be further divided into the substages of:

• late Late Arikareean: Lower boundary source, base ofGeringian (approximate)^[2]
• early Late Arikareean: base of Geringian (approximate). Upper boundary source: base of Hemingfordian (approximate).
• late Early Arikareean: Lower boundary source of base of Geringian (approximate). Upper boundary source of base of Hemingfordian (approximate).
• early Early Arikareean (shares lower boundary): Upper boundary source of base of Hemingfordian (approximate).

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