File:Canada and its provinces - a history of the Canadian people and their institutions by one hundred associates (1913) (14595716857).jpg

Identifier: canadaitsprovin09shor (find matches)
Title: Canada and its provinces : a history of the Canadian people and their institutions by one hundred associates
Year: 1913 (1910s)
Authors: Shortt, Adam, 1859-1931 Doughty, Arthur G. (Arthur George), Sir, 1860-1936
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Publisher: Toronto : Printed by T. & A. Constable at the Edinburgh University Press for the Publishers' Association of Canada
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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■Cajiada ;uid Its Proviures GLACIAL AND RECENT GEOLOGICAL HISTORY 59 than the uplift of the continent as a whole, but the latterhypothesis also helps to account for the Glacial period which,after the close of the Tertiary, seized the northern half of thecontinent in its icy grasp. Virtually, the whole of the landarea was covered by glacial ice, which extended south into theUnited States, in the west to the 48th parallel, in the regionof the Great Lakes to about the 37th. The Arctic islands,however, do not appear to have supported glaciers any largerthan those now found on portions of Baffin and EllesmereIslands ; the northern portion of the Yukon, as the Klondikeregion, and the greater part of Alaska were not glaciated atall, nor were the Magdalen Islands in the Gulf of St Lawrence.Moreover, the glaciation was the result, not of one, but ofseveral large ice-sheets which reached their respective maxi-mum thicknesses and extents at different times, if indeed theyexisted at the same ti

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