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The Cenozoic Era

    cenozoic timescale
The Cenozoic Era 's place in the geologic time scale.
Modified from Kazlev 2002.

        The earliest members of the family Equidae first appeared during the Cenozoic Era (Prothero 1998).  This was an era in which there was a great radiation of mammals: the mass extinction at the Cretaceous-Tertiary boundary left many niches open for the evolution new organisms (WGBH 2001). The Cenozoic Era is the most modern geologic era: the beginning was marked by the K-T extinction, and the era continues to the present.  From the earliest to the most recent, the Cenozoic Era is divided into the Tertiary Period, which is subdivided into the Paleocene, Eocene, Oligocene, Miocene, and Pliocene Epochs, and the Quaternary Period, which is subdivided into the Pleistocene and Holocene Epochs (Kazlev 2002).

Paleocene        Eocene        Oligocene        Miocene        Pliocene        Pleistocene        Holocene
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