Ice-sheets and their Accumulation.
VIEWS OF OTHERS AND OF THE AUTHOR.

In writing of the history of the Ice age, the growth and culmination of the ice-sheets, and their action in eroding, transporting and depositing the glacial drift, terms have been often used which imply or definitely assert an advance, incursion or invasion by the border or somewhat steep front of the ice, extending itself thus over new territory. In North America, especially where the ice-covered area at the maximum stage of glaciation was about 4,000,000 square miles, the language of glacialists frequently brings before us a picture of a thick ice-sheet amassed by snowfall upon its central areas of outflow in Canada, as on the Laurentide highlands north of the Saint Lawrence river, over the basin of James and Hudson bays, on the country extending westward to the Athabasca, Reindeer and Winnipeg lakes, and west of the Rocky mountains . . .

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