Image: Portage escarpment

Description: Rough map of the Portage Escarpment (black line) as it begins in eastern New York state and moves across New York, Pennsylvania, and Ohio into Kentucky (where it becomes the Highland Rim). Escarpment route based on information in: Bolsenga, Stanley J.; Herdendorf, Charles E. (1993). "Introduction". In Bolsenga, Stanley J.; Herdendorf, Charles E. Lake Erie and Lake St. Clair Handbook. Detroit: Wayne State University Press. ISBN 9780814324707; Cushing, Henry Platt; Leverett, Frank; Van Horn, Frank R. (1931). Geology and Mineral Resources of the Cleveland District, Ohio. Bulletin 818. Washington, D.C.: U.S. Geological Survey; and Pearson, C.S.; Johnsgard, J.A.; Secor, Wilber; Kerr, H.A.; Westgate, P.J.; Kirby, R.H.; Goodman, R.B.; Cline, M.G.; Simmons, C.S.; Granville, J.M. (August 1956). Soil Survey: Livingston County, New York. Series 1941, No. 15. Washington, D.C.: Soil Conservation Service, U.S. Department of Agriculture.
Title: Portage escarpment
Credit: openstreetmap.org
Author: Tim1965
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