Pliocene was the time when animals could freely move between North America, South America, and Florida.
The Pliocene (sometimes Pleiocene) is a geologic epoch that lasted from 5.333 million to 2.58 million years ago. It is the second and most recent period of the Neogene Period in the Cenozoic Era. The Pliocene Epoch follows the Miocene Epoch and is followed by the Pleistocene Epoch. Prior to the 2009 revision of the geologic time scale, which includes the four most recent major glaciations entirely inside the Pleistocene, the Pliocene also included the Gelasian Stage, which lasted from 2.588 to 1.806 million years ago and is now included in the Pleistocene.
The geological layers that characterize the start and end of the period, like with other previous geological periods, are well established, although the precise dates of the start and end of the period are unknown.
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