Publisher's Synopsis
Excerpt from Man in the Ice Age at Lansing, Kansas, and Little Falls, Minnesota
The coarse debris in the lower part of the tunnel contained, so far as we could observe, no glacial drift pebbles or'sto-nes of foreign origin, though they are frequent in the thin gla cial drift which overlies the rock surfaces near. Many of these drift 'stones and boulders are of the red Sioux quartzite, which outcrops 300 to 350 miles northward, in southwestern Minnesota, the, northwest corner of Iowa, and the southeast part of South Dakota. It occurs 1n this Kansan drift mostly in small fragments, but often one to two' feet in diameter, and occasionally even measuring five feet, or more, and weighing several tons, The southern boundary of the glacial drift, marking the limit of the continental ice-sheet/in its extreme extension during the Kansan stage of the Glacial period, is at a line passing from east to west, as mapped by Chamberlin and mcgee, about 12 or 15 miles south of the Kansas (com mouly called the Kaw) 11ver, and 25 or 30 miles south of Lan sing 'l'
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