glacial epoch

Pronunciation:			'gleyshul 'epuk
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WordNet Dictionary
	Definition:		[n]  from 11 thousand to 2 millions years ago; extensive glaciation of the northern hemisphere; the time of human evolution [n]  any period of time during which glaciers covered a large part of the earth's surface
	Synonyms:		glacial period, ice age, Pleistocene, Pleistocene epoch
	See Also:		Age of Man, epoch, geological period, period, prehistory, Quaternary, Quaternary period