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1. Any period of time during which glaciers covered a large part of the earth's surface
   - ice age, glacial period

1. From two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution
   - Pleistocene, Pleistocene epoch

Derived forms: glacial epochs

Type of: epoch, geological period, period

Part of: Age of Man, prehistoric culture, prehistory, Quaternary, Quaternary period

Encyclopedia: Glacial epoch