White, Sidney E. Department of Geology and Mineralogy, Ohio State University, Columbus, Ohio.
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A period that encompasses the last 2.6 million years of the Cenozoic Era, and is concerned with major worldwide glaciations and their effect on land and sea, on worldwide climate, and on the plants and animals that lived then. The Quaternary is divided into the Pleistocene and Holocene (see illustration). See also: Cenozoic; Holocene; Pleistocene
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