From Longman Dictionary of Contemporary EnglishIce AgeˈIce Age noun [countable] SHPERIOD OF TIMEone of the long periods of time, thousands of years ago, when ice covered many northern countries
Examples from the Corpus
Ice Age• It could seize up Washington harder than another Ice Age.• A volcano has even been blamed for speeding up the onset of the last Ice Age.• As the Ice Age passed and the earth warmed, the glaciers, year by year, retreated.• Global sea level was 120 metres below the present level during the Ice Age.• But once the snow arrives, the technology of getting rid of it is little changed from the Ice Age.• And a secret unravelled ... the bones that solve the mystery of the Ice Age.• The shot immediately holds your interest, perhaps because our ancestors right back to the Ice Age were great walkers. 