The Pleistocene is defined by

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The Pleistocene is defined by a series of glacial advances and retreats, also known as the Ice Age. This period lasted from about 2.6 million years ago until about 11,700 years ago, when the last major ice age ended. While the evolution of the genus Homo and the development of stone tool making techniques did occur during the Pleistocene, they are not defining characteristics of the period. The mass extinction that killed off the dinosaurs occurred at the end of the Cretaceous period, long before the Pleistocene.

The Pleistocene Is Defined by