The physical geography of New York state . a nearly uni-form level, as they do in parts of Great Britain (p. 92).In Britain the explanation of this fact has been marine i Davis, Amer. Journ. Sci. XXXVII, 1889, 430; Davis and Wood, Proc. BostonSoc. Nat. Hist., XXIV, 1888-1889, 365-423 ; Davis, Bull. Geol. Soc. Amer. II, 1891,545; National Geog. Mag., V, 1893, 68; Bull. Geol. Soc. Amer. VII, 1896, 377; Mono., I, 1896, 269; Tarr, Amer. Geol., XXI, 1898, 351-370; Davis, , XXIII, 1899, 207-239; Daly, Amer. Nat. XXXIII, 1899, 127-138; Smith, Univer-sity California, Bull. Dept. Ge
The physical geography of New York state . a nearly uni-form level, as they do in parts of Great Britain (p. 92).In Britain the explanation of this fact has been marine i Davis, Amer. Journ. Sci. XXXVII, 1889, 430; Davis and Wood, Proc. BostonSoc. Nat. Hist., XXIV, 1888-1889, 365-423 ; Davis, Bull. Geol. Soc. Amer. II, 1891,545; National Geog. Mag., V, 1893, 68; Bull. Geol. Soc. Amer. VII, 1896, 377; Mono., I, 1896, 269; Tarr, Amer. Geol., XXI, 1898, 351-370; Davis, , XXIII, 1899, 207-239; Daly, Amer. Nat. XXXIII, 1899, 127-138; Smith, Univer-sity California, Bull. Dept. Geol, II, 1899, 155-178. I)<xtrttrfii»nil Plains 101 denudation; but in this country it is ascribed to denuda-tion in the air, or subaerial denudation. If the landremained at a nearly uniform level for a long enough time,even the highest mountains would be planed down nearlyto sea-level, or to base-level. In proof of this may bementioned the fact that New York City is situated in alow hilly region which represents the last remnants of a. FIG. 46. A view across the peneplain of New England (photograph by J. Ritchie, Jr.). once elevated mountain system, as do the hills of Connec-ticut, eastern Massachusetts and the Highlands of NewJersey. It is difficult to account for the uniformity of level ofthese hills on any other supposition than that at one timethey were at a lower level with reference to the sea, hav-ing been either beveled down to a hilly lowland conditionor else to the condition of a plain, a peneplain.* Thereasons for this conclusion are as follows. It is kno\viithat the country was originally mountainous, because therocks are very complexly folded; and these contortedstrata vary in hardness. Therefore, at first, tilted rocksof different kinds were raised to different heights. Atpresent, in many cases, they stand, still at an elevation ofone or two thousand feet above the sea, but with the hill- 1 This might have been done by marine denudation or by subaerial denudat
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