National Geographic : 1894 May 23
Cincinnati-CapeHatteras Axis. 81 These are lines of maximum elevation and they have had a predominant influence in producing the present topography of the province. They coincide with the present mountains and in a general way parallel the great structural features of the Appalachian valley. Transverse Axes of Oscillation.-In addition to the predominat ing longitudinal axes a number of interesting transverse axes are brought out by the contours representing the deformed Cre taceous peneplain. In the central portion of the map the con tours swell out on either side, giving a broader and more regular profile to the elevation than elsewhere. This is suggestive of a transverse line of uplift intersecting the longitudinal axes nearly at right angles. If this line be prolonged in both directions it is found to connect Cincinnati and cape Hatteras, both of which have been recognized as occupying regions of recent elevation. As early as 1871 Shaler * described a transverse uplift which he concluded had produced the great projection of the coast line at cape Hatteras; also McGee has shown that this axis has been an important factor in determining the form of the coast line during the time represented by the deposition of the coastal plain sediments. He describes it f as " an axis of interruption or change in epeirogenic movement during every geologic period since the Cretaceous." If this line from cape Hatteras to Cin cinnati be continued across the Ohio river its direction will be found to coincide with that of the main or northwestward branch of the Cincinnati arch which crosses Indiana to Chicago. Al though, with the information at present available, it cannot be asserted that motion has taken place along the southeastern por tion of the line except in post-Cretaceous time, still the coinci dence of the two axes suggests the probability that there was orogenic movement in the Appalachian region during the uplift of the Cincinnati arch in Ohio and Indiana, and, conversely, that north of the Ohio river may yet be found traces of post-Paleozoic movements corresponding to the later uplifts in the vicinity of cape Hatteras. The probability of such contemporaneous move ment is increased by the fact that in the southern portion of the province evidence was found by the writers proving that certain * On the Causes which have led to the Production of cape Hatteras, by Professor N. S. Shaler: Proc. Bost. Soc. Nat. Hist., vol. xiv, pp. 110-121. t The Lafayette Formation, by W J McGee: 12th Annual Report U. S. Geological Survey, 1891, p. 403.
1894 Jun 22
1894 Apr 25