Overview

Excerpt from Report on the Terminal Moraine in Pennsylvania and Western New York In my preface to Report Q on Beaver county page xxv, I summarized the facts regarding the terraces Of the Monongahela, Ohio and Beaver rivers. And showed the necessity for supposing a Slack-water submergence of the upper Ohio valley system; and also my ignorance of any means by which it could have been produced. Mr. Wright's ice-dam at Cincinnati furnished the means. How high the ice-dam was cannot be known. How high a level Of slack-water it maintained can only become known after a careful level-survey Of the lowest divides in Ken tucky by which the reservoir could deliver itself around the end of the ice. Even then we shall not know how many feet or yards higher than now these divides may have been then; nor how many feet or yards they were cut down during the many years Of the existence Of the ice-dam nor whether part of the out-pour was not accomplished underneath the ice-dam; nor what was the quantity and violence of the in-pour from above; nor whether it varied much or little with the seasons; nor the length Of time which the ice-dam lasted, whether years, or centuries; nor whether it was a single event, or was repeated. All we know is that the American ice sheet at its greatest extension crossed the Ohio and stopped back the drainage Of the entire water basin of East Kentucky, South-east Ohio, West Virginia, and Western Pennsylvania, up to some level, at least A. T. As shown by the terminal moraine upon the hills north and south of the Ohio river, above and below Cincinnati. Since the lst, 2ud, and 3d drift-terraces at Beaver and New Brighton lie about 750' and 800' A. T. They can now be satisfactorily accounted for. About the Publisher 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.

Full Product Details

9781330713396

Table of Contents

Reviews

Author Information

Tab Content 6

Customer Reviews

Recent Reviews

Countries Available