Abstract
ONCE upon a time in North America the continental ice-sheet attained an area of about four million square miles, while its maximum thickness, in the central portion, was probably from one to two miles. It extended from the Atlantic to the Pacific, and from the northern United States to the Arctic Sea. During the closing stage of this glaciation there existed an immense lake, whose area is estimated to have been about 110,000 square miles; a lake which extended 700 miles in length, and attained a width of 250 miles. Its maximum depth was 700 feet above the present level of Lake Winnipeg.
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W., H. Monographs of the United States Geological Survey. Nature 58, 81–82 (1898). https://doi.org/10.1038/058081a0
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DOI: https://doi.org/10.1038/058081a0