Excerpt from Niagara in London: A Brief Study From Many Standpoints Dr. Pohlman of Buffalo - Reduces the time of retrocession to years. Now such inconsistency as exists in these conclusions is due to the fact that they are drawn from varying data. Moreover, a radical difference in theory exists as to the course of the prehistoric outlet of Lake Erie. Hitherto the two great authorities on the retrocession of Niagara Falls have been Sir Charles Lyell and Prof. James Hall. As we have seen, the former held that it was ...
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Excerpt from Niagara in London: A Brief Study From Many Standpoints Dr. Pohlman of Buffalo - Reduces the time of retrocession to years. Now such inconsistency as exists in these conclusions is due to the fact that they are drawn from varying data. Moreover, a radical difference in theory exists as to the course of the prehistoric outlet of Lake Erie. Hitherto the two great authorities on the retrocession of Niagara Falls have been Sir Charles Lyell and Prof. James Hall. As we have seen, the former held that it was approximately correct to allow about a foot a year for the retrocession. From the variable nature of the strata over which the river ows, the circum stances that affect the rapidity of the erosion differ all along its course. Eminent geologist that'he was, Lyell had not the advantage of a series of actual observa tions. Previous to the careful trigonometric survey made in 1842, under the direction of Prof. Hall, for the new-york State Geological Survey, no marks of monuments had been fixed. Prof. Hall showed that after a further recession of about two miles the Falls will encounter a thick stratum which may permanently resist erosion, with their height reduced to about 80 feet. 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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