Monographs of the United States Geological Survey
1898; Nature Portfolio; Volume: 58; Issue: 1491 Linguagem: Inglês
10.1038/058081a0
ISSN1476-4687
Autores Tópico(s)Rangeland and Wildlife Management
ResumoONCE 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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