Topic: glacial periods

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glacial periods

The Columbia Encyclopedia, Sixth Edition
glacial periods times during which large portions of the earth's surface were covered with thick glacial ice sheets. In the Pleistocene epoch , in the Carboniferous and Permian periods of the Paleozoic era era, and in Huronian time of the Precambrian era , the earth experienced an overall cooling of the climate, resulting in great ice sheets covering great portions of the oceans and continents . More or less extensive continental glaciations, or glacial advances, may have occurred at other times. The study of glacial periods owed its first impetus to the Swiss-American naturalist... Read more
glacial
The Oxford Pocket Dictionary of Current English ... resulting from, or denoting the presence or agency of ice, esp. in the form of glaciers: thick glacial deposits a glacial lake. 2. of ice; icy: the glacial mountains of New Zealand | fig. glacial blue eyes. ∎  extremely cold: glacial temperatures ... Read more
period
The Columbia Encyclopedia, Sixth Edition period unit of time on the geologic timescale . Periods are shorter than an era and longer than an epoch. Periods are of variable length, generally lasting tens of millions ... designate a characteristic of geologic time, such as the glacial period. Author not available, PERIOD. , The Columbia Encyclopedia ... Read more

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