The physical geography of New York state . odel of Ithaca sheet (United States Geological Survey) by William cjtranahan). Destructional Plain* 97 coarse, sandy shales which resist the agents of western New York, in Chautauqua County, there aretwo plains, (1) that in which Lake Erie is placed, which isfaced on the southern side by a steep escarpment,1 rising(2) to a hilly plateau region in which Lake Chautauqua issituated. At present there seems to be in the rock struc-ture no definite reason for this upland plateau and for theescarpment which separates it from the lower plain; bu
The physical geography of New York state . odel of Ithaca sheet (United States Geological Survey) by William cjtranahan). Destructional Plain* 97 coarse, sandy shales which resist the agents of western New York, in Chautauqua County, there aretwo plains, (1) that in which Lake Erie is placed, which isfaced on the southern side by a steep escarpment,1 rising(2) to a hilly plateau region in which Lake Chautauqua issituated. At present there seems to be in the rock struc-ture no definite reason for this upland plateau and for theescarpment which separates it from the lower plain; but insouthern Chautauqua County, and across the line, in Penn-sylvania, there are remnants of a conglomerate bed (p. 27),now remaining upon the surface in the form of rockcities,2 where the great blocks, loosened by weathering,and perhaps somewhat disturbed by glacial action, nowstand in confused, and often fantastic arrangement uponthe surface of the land (Fig. 44) The former extension ^^?-<£^\ **W^i ••• i £ w^^r^^^^v^^ifc^,. FIG. 42. To illustrate the process of destruction of a plain in western Kansaswhere hills capped by a hard layer are being separated to form butteslike those in Fig. 41 (photograph by Professor Williston). of this conglomerate may account for the plateau and itssteep north-facing escarpment. At the base of the Lake Erie escarpment, on the north-ern border of the plateau just described, there is another 1 T:irr, Bull. 109, Cornell Univ. Agri. Experiment Station, 189G, 92. 2 Hall, Geol. of New York, 4th , ls»:t. Jsl-is:,; Carll, Second Geol. Survey,Pennsylvania, Report III, 1880, 57-79; Same, Report IIII, 1883, 195-208. G 98 The Physical Geography of New York State plain (p. 9), of which the bottom of Lake Erie forms a New York a narrow portion of this plain occupies thearea between the escarpment and the shores of Lake Erie;and upon it the City of Buffalo is situated. In this regionthe plain is broad and fairly level, disappeari
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