Definitions for "QUATERNARY PERIOD"
(Geology) A period consisting of approximately the last 2 million years of earth history, encompassing both the Pleistocene and the Holocene epochs.
The geologic period ranging from two million years ago to the present. It is divided into two epochs: the Holocene (10,000 years ago to the present) and the Pleistocene (two million to 10,000 years ago).
The most recent geologic period of the Cenozoic Era, the Quaternary began 2 million years ago with the growth of northern hemisphere continental glaciers and the ice age. PICTURE