The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . Fig. 54—Sand pit at Warren, showing bar on top of slack water t.*./-.^^ •>. Fio. .—Bar at Warren, showing bedding and elevation above Warren. CHAPTER VTI. (concltjded) THE GLACIAL BOUNDARY WEST OF PENNSYLVANIA. Throu<?h Columbiana county, Ohio, as in the adjoiningcounties of Pennsylvania, there is, to the south of the heavyaccumulati
The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . Fig. 54—Sand pit at Warren, showing bar on top of slack water t.*./-.^^ •>. Fio. .—Bar at Warren, showing bedding and elevation above Warren. CHAPTER VTI. (concltjded) THE GLACIAL BOUNDARY WEST OF PENNSYLVANIA. Throu<?h Columbiana county, Ohio, as in the adjoiningcounties of Pennsylvania, there is, to the south of the heavyaccumulations of till, a fringe of thinner glacial deposits fromone to three miles wide. Over this margin there are scat-tered evidences of glacial action, consisting of granitic bowl-ders and patches of till here and there upon the highlands, * See G. F. Wright, The Glacial Boundary in Ohio. Indiana, and Ken-tucky, Western Reserve Historical Society; also Ohio Geological Report,Tol. V, pp. 750-771; T. C. Chamberlin, Extent, etc., of the Wisconsin Ket-tle Range (Transactions of the Wisconsin Academy of Sciences, vol. iv);Geological Survey of Wisconsin, vols, ii and iii (Madison, 1877-80); Pre-liminary Paper on the Terminal Moraine of the Second Glacial Epoch (InitedStales Report); George H. Cooii, Annual Repor
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Keywords: ., bookauthoruphamwarren18501934, bookcentury1900, bookdecade1910
