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ice age
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A polar map shows five great ice caps, or centres, from which the ice moved outward during the Ice Age and to which it later retreated. North American ice sheets European ice sheets
Examine glacial scratches on rocks from Switzerland to New York City for evidence of Earth's icy past
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A polar map shows five great ice caps, or centres, from which the ice moved outward during the Ice Age and to which it later retreated.
A polar map shows five great ice caps, or centres, from which the ice moved outward during the Ice Age and to which it later retreated.

ice age

geology
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Also known as: glacial epoch
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Also called:
glacial age

News •

Mastodon teeth found in couple's backyard may shed light on New York's Ice Age • Dec. 21, 2024, 5:26 AM ET (CBC)
Homeowner finds complete Ice Age mastodon jawbone while gardening in his Hudson Valley backyard • Dec. 20, 2024, 12:40 AM ET (Jerusalem Post)
Early humans were 'big game hunters' with mammoth appetites, new research shows • Dec. 15, 2024, 4:39 AM ET (CBC)
Study: Ancient Americans Depended Heavily on Mammoth for Food • Dec. 13, 2024, 12:58 AM ET (Voice of America)

ice age, any geologic period during which thick ice sheets cover vast areas of land. Such periods of large-scale glaciation may last several million years and drastically reshape surface features of entire continents. A number of major ice ages have occurred throughout Earth history. The earliest known took place during Precambrian time dating back more than 570 million years. The most recent periods of widespread glaciation occurred during the Pleistocene Epoch (2.6 million to 11,700 years ago).

North American ice sheets
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North American ice sheetsThe orange, pink, green, and purple areas are those that were covered by ice sheets in the past. The Kansan and Nebraskan sheets overlapped almost the same areas, and the Wisconsin and Illinoisan sheets covered approximately the same territory. An area at the junction of Wisconsin, Minnesota, Iowa, and Illinois was never entirely covered with ice.
European ice sheets
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European ice sheetsEurope, like North America, had four periods of glaciation. Successive ice caps reached limits that differed only slightly. The area covered by ice at any time is shown in white.

A lesser, recent glacial stage called the Little Ice Age began in the 16th century and advanced and receded intermittently over three centuries in Europe and many other regions. Its maximum development was reached about 1750, at which time glaciers were more widespread on Earth than at any time since the last major ice age ended about 11,700 years ago.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Adam Augustyn.