The oligocene deposits in the fayum of Egypt contain many of the earliest-known monkeys fossils.
Egypt is the most significant Oligocene location. The first signs of the developing old world monkeys have been found in the Fayum region of the Western Desert, specifically in the Qasr El Sagha and Jebel Qatrani formations. This paleoenvironment was home to the Oligocene higher primates Aegypto..pithecus, Proplio..pithecus, Para..pithecus, and Api..dium, both of which are known to have been arboreal based on their postcranial fossils.The first two are from the Sagha Formation, officially the latest Eocene in age, but the deposits are continuous, along with some other unknown affinities.
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