. Annals of the New York Academy of Sciences. Science. 08B0R^\ REVIEW OF THE PLEISTOCENE 25: the deposits of this glacial advance are knoMTi as the old "Diluvium" or the "Oldest Drift;" the advance is termed the Scanian by Geikie. In the Alpine Eegion it has been termed the Gilnz by Penck and Briickner, and the drift deposits have a general thickness of 30m. At about the same time a great ice cap was formed in British North America west of Hudson Bay from a centre known as Keewatin which sent its ice sheets into Iowa and Nebraska. The resulting Nebraskan deposits, consistin
. Annals of the New York Academy of Sciences. Science. 08B0R^\ REVIEW OF THE PLEISTOCENE 25: the deposits of this glacial advance are knoMTi as the old "Diluvium" or the "Oldest Drift;" the advance is termed the Scanian by Geikie. In the Alpine Eegion it has been termed the Gilnz by Penck and Briickner, and the drift deposits have a general thickness of 30m. At about the same time a great ice cap was formed in British North America west of Hudson Bay from a centre known as Keewatin which sent its ice sheets into Iowa and Nebraska. The resulting Nebraskan deposits, consisting largely of compact boulder clays, are often thickly set with woody ma-. West Longitude 80 from Oreenwic^ Fig. S.—Chief centers of North American glaciation Keewatin, Labradorean, Cordilleran. After Leverett. terial gathered from forests of spruce and other coniferous species that indicate the development of a cool temrperate flora in advance of the glaciation. ^^ It does not appear that a glacial cap of any considerable extent was formed in Great Britain; but Geikie^^ shows that along the British coast *The above correlation is presented chiefly on the authority of Penck and Leverett (op. ctt, 1910). 38 Geikie^ James : Tbe Great Ice Age. 2nd Ed. London, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York Academy of Sciences. New York, New York Academy of Sciences
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