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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 flows, 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.
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