Note 581 — Chapter XIII

At this period Greenland, all Canada, a corner of Alaska, and a good part of the United States were covered with glaciers almost uninterruptedly. The limit of the moraine to the south may be indicated by a line which, leaving New York, for Lake Erie, would follow the course of the Ohio as far as the region of its junction with the Mississippi, and would be continued along or a little to the west and to the south of the Missouri to coincide then with the Canadian frontier. The fauna of the American quaternary period differed somewhat from that of Europe: the Rhinoceros tichorhinus, for instance, was missing, while the Mastodon ohioticus and several large edentata, such as the Megatherium, Mylodon, etc., are met with.