Definitions for "Pleistocene epoch"
The geologic epoch of 1.8 million - 8,000 years ago– the earliest epoch of the Quaternary, also known as the "Great Ice Age."
Beginning two million years ago, this epoch saw the most recent ice ages and the coming of man to North America.
The first epoch of the Quaternary Period, beginning 2 to 3 million years ago and ending approximately 10,000 years ago. See also Holocene Epoch.