Glacier theory

(Geol.) the theory that large parts of the frigid and temperate zones were covered with ice during the glacial, or ice, period, and that, by the agency of this ice, the loose materials on the earth's surface, called drift or diluvium, were transported and accumulated.

See also: Glacier

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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He wrote the glacier theory had grown until 'like the imaginary glaciers themselves, it overspread the earth', even 'to Brazil and employed to excavate the valley of the Amazon.