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Bog, hæftet New Method of Estimating the Age of Niagara Falls (Classic Reprint) af G. Frederick Wright

New Method of Estimating the Age of Niagara Falls (Classic Reprint)

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Excerpt from New Method of Estimating the Age of Niagara Falls

In 1841 Sir Charles Lyell and the late Prof. James Hall visited the falls together; but, having no means of determining the rate of recession, except from the indefinite reports of residents and guides, they could... Læs mere

Excerpt from New Method of Estimating the Age of Niagara Falls

In 1841 Sir Charles Lyell and the late Prof. James Hall visited the falls toge... Læs mere

Produktdetaljer:

Sprog:
Engelsk
ISBN-13:
9781334401985
Sideantal:
24
Udgivet:
01-11-2016
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Excerpt from New Method of Estimating the Age of Niagara Falls

In 1841 Sir Charles Lyell and the late Prof. James Hall visited the falls together; but, having no means of determining the rate of recession, except from the indefinite reports of residents and guides, they could place no great confidence in the guess, made by Sir Charles Lyell, that it could not be more than one foot a year. As the length of the gorge from Lewiston up is about seven miles, the time required for its erosion at this rate would be thirty-five thousand years. The great authority and popularity of Lyell led the general public to put more confidence in this estimate than the distinguished authors themselves did. Mr. Bakewell, another eminent English geologist, at about the same time estimated the rate of the recession as threefold greater than Lyell and Hall had done, which would re duce the time to about eleven thousand years.

But, to prepare the way for a more definite settlement of the question, the New York~ Geological Survey, under Professor Hall's direction, had a careful trigonometric survey of the Horseshoe Fall made in 1842, erecting monuments at. The points at which their angles were taken, so that, after a sufficient lapse of time, the actual rate2 estimating the age OF niagara falls.

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Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

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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