. Canada and its provinces; a history of the Canadian people and their institutions . Ihf yjinbiiryli i;c:i^-«pKi Im ( . :iu<l lis ^ 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
. Canada and its provinces; a history of the Canadian people and their institutions . Ihf yjinbiiryli i;c:i^-«pKi Im ( . :iu<l lis ^ 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 EUesmereIslands ; 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 , 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 i
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