Cretaceous Deposits Of The Pacific Coast Primary Source Edition

Author : Frank M. Anderson
Publisher :
ISBN 13 : 9781330459768
Total Pages : 342 pages
Book Rating : 4.4/5 (597 download)

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Download or read book Proceedings of the California Academy of Sciences, Vol. 2 written by Frank M. Anderson and published by . This book was released on 2015-06-28 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Proceedings of the California Academy of Sciences, Vol. 2: Cretaceous Deposits of the Pacific Coast The Cretaceous deposits of the Pacific Coast of North America, as already known to geologists, lie within a narrow continental border mainly to the west of the Great Basin and the northern Cordillera. In their north and south range the scattered and disconnected occurrences extend from Mexico to Alaska and the Arctic Ocean, although they do not territorially cover a large region. Represented upon a map with other formations, they might hardly be noticed except by one looking for them. They are but remnants, or even mere traces, of what was once a more extensive system of deposits, which in some places have been entirely removed, and in others covered by later sediments, and in some cases by volcanic flows. One of the largest and most noteworthy of these remnants occupies the Sacramento Valley in central-northern California, where it occurs in unconnected dashes along its borders, in low hills flanking the valley upon the east and west. Southward in California, the Cretaceous rocks are sparingly distributed, occurring only at intervals in the Coast Ranges, where they either form some of the lesser ridges or protrude from beneath ridges of later sediments. In the extreme southern portion of the State, and in Lower California, they are confined to a narrow belt in the immediate neighborhood of the coast, buttressed against the older crystalline rocks of the interior. Northward in California, and in Southern Oregon, the Cretaceous beds are restricted to the larger valleys lying among the Klamath Mountains or upon their eastern outskirts; and here, also, they rest upon the older crystalline or metamorphic rocks, and are overlaid by Tertiary or Neocene deposits largely of fresh-water origin, or by Neocene lavas. 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.