Excerpt from Report of the Geological Survey of Ohio, 1878, Vol. 3: Geology and Paleontology; Part 1, Geology During the first two years Of the existence Of the Geological Survey, much attention was given to the Cincinnati arch, and its structure and age were then, for the first time, accurately determined. These are dis cussed at some length in the first volume Of this report, and it is there stated that this arch is a great fold Of the strata raised at the close Of the Lower Silurian age, when it formed two islands, one ...
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Excerpt from Report of the Geological Survey of Ohio, 1878, Vol. 3: Geology and Paleontology; Part 1, Geology During the first two years Of the existence Of the Geological Survey, much attention was given to the Cincinnati arch, and its structure and age were then, for the first time, accurately determined. These are dis cussed at some length in the first volume Of this report, and it is there stated that this arch is a great fold Of the strata raised at the close Of the Lower Silurian age, when it formed two islands, one in Tennessee, the other in Kentucky and Ohio, around which the more recent rocks were deposited on a mping shore. It was also shown that no evidence exists that these islands have ever been completely submerged since the close of the Lower Silurian age, and it was suggested that the broad, depressed areas Of Silurian rocks, which now mark their sites, were produced by the solution and removal by atmospheric water Of the limestones Of which they were composed. Some doubt has been expressed by Prof. E. T. Cox, the able State Geol Ogist Of Indiana, whether the theory Of the history and structure Of the Cincinnati arch, given in our report, is the true one, and he advances the view that it should be rather regarded as a. Mass Of the Lower Silu rian limeston???es which formed a highland Of the ancient continent, sub sequently submerged, and receiving on its top and sides the sediments that compose the more recent groups Of rocks. In answer to this theory, it may be said that, whatever it may seem to be in Indiana, the Cincin nati axis in Ohio is unmistakably an anticlinal ridge. Of which the arched strata Of the Cincinnati group form the core, the more recent formations resting On these, and dipping away on either side. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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