The Middle West is littered with deposits of rocky glacial debris, in widely scattered areas and apparently dating from widely separated eras. Most glaciologists account for them by a theory that the huge Pleistocene glacier advanced and retreated four times, dropping its deposits each time as it melted back. Last week Professor Richard J. Lougee of Clark University, Worcester, Mass., offered a new theory. At the Washington meeting of the American Association for the Advancement of Science, he argued that the glacier did not retreat, but stayed in place so long that its...
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