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Excerpt from Geology of the Attica-Depew Quadrangles The area embraced within these quadrangles lies between the lines of 420 45' and 43 Degrees north latitude, and 78 Degrees 15' and 78 Degrees 45' west longitude and contains 455 square miles. It is situated just where the sloping front of the great Allegany plateau begins to bend from a generally east and west line to a direction nearly southwest and parallel to the southern shore of Lake Erie. The point of lowest altitude is in the northwest corner of the Depew quadrangle where it is 585 feet above sea level, or 338 feet above Lake Ontario and 12 feet higher than Lake Erie, while the crest of the ridge west of Varys'burg reaches, on the southern boundary line of the Attica quadrangle, the height of 1780 feet, showing a difference in elevation of 1195 feet. The rock strata of this region have an average southward clip or declination estimated to be about 33 feet a mile, or 577 feet on a north and south line across the quadrangles. Adding this thickness which is lost from the difference in elevation, the total thickness of the rock section or Surface rocks shown on the maps is approximately 1772 feet. The basal strata of this rock section to the thickness of about 100 feet belong to the Ontaric or Siluric system, and lie at the foot and to the north of the rocky declivity known as the Helder berg escarpment that extends from Albany county to the Niagara river, and crosses the Depew quadrangle near its northern bound ary. The Siluric strata and their contact with the overlying basal formation of the Devonic system are finely exposed in several quarries along the front of the escarpment. 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.

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