The Quarry Industry in Southeastern New York (Classic Reprint)

Angebote / Angebote:

Excerpt from The Quarry Industry in Southeastern New YorkFor a detailed discussion of the geology of this part of the area, reference must be made to Dr Merrill's paper on the Crystal line rocks of southeastern New York, published in the 50th annual report of the New York state museum. Reports on Orange and Rockland counties, by Dr Ries and Dr Kiimmel respectively, have also been issued. The Devonian outlier extending in Orange county from near Cornwall to Greenwood lake, has been discussed in detail by Mr N. H. Darton.The oldest formation in the area is a series of gneisses of pre Cambrian age, forming the mass of the Highlands. To the northwest of this range is the great lowland, based on Cambro Ordovician limestones and shales. A structural basin lying on the northwest ¿ank of the main body of pre-cambrian rocks, but separated from the Paleozoic lowland in Orange county by a series of small pre-qambrian outliers, contains Upper Silurian and Devonian formations. East and southeast of the pre-oam brian mass, on the western side of the Hudson, is a region in which the sedimentary rocks have been highly metamorphosed, the sandstones, limestones and shales of the normal Cambro Ordovician appearing here as quartzites, highly crystalline lime. Stones, and schists. As a further result of the forces to which they have been subjected the strata, originally laid down in a nearly horizontal position, now form a series of folds, trending generally northeast and southwest, both Paleozoic and pre Cambrian beds being involved in these folds. South of the pre Cambrian, to the west of the Hudson river, these altered Paleozoic rocks are almost entirely overlain by the Newark rocks, which cover most of Rockland county. In addition to the formations noted above, which are parts of a normal suc cession, igneous rocks occur as intrusives of later date.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.