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Monographs of the United States Geological Survey (Volume 13) (Paperback) Loot Price: R637 Discovery Miles 6 370
Monographs of the United States Geological Survey (Volume 13) (Paperback): Geological Survey
Monographs of the United States Geological Survey (Volume 13) (Paperback): Geological Survey

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Monographs of the United States Geological Survey (Volume 13) (Paperback)

Geological Survey

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Loot Price R637 Discovery Miles 6 370

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888. Excerpt: ... CHAPTER III. THE SEDIMENTARY ROCKS. General character.--The Coast Ranges of California present a truly remarkable opportunity for the investigation of some of the most important phenomena embraced under the general term of metamorphism. To give a clear ideaof the unusual advantages afforded by this area it is necessary to anticipate some of the results reached. Field examinations were made for this memoir at numerous points from above Clear Lake to the region of New Idria, thus partially covering a belt of the Coast Ranges about 230 miles in length. Throughout this whole region there is structural and lithological evidence that granite of very uniform character underlies the entire country. Excepting the belt of schists along the coast from Santa Cruz southward, it is estimated that 90 per cent. of all the rocks of this region are sandstones, altered or unaltered. These sandstones are also extremely uniform in character, and wherever they are inconsiderably modified the slides prepared from them show that they are directly or indirectly derived from the granite, or, in other words, that they are arcose. Of this material of known origin a portion has been highly altered. The alteration processes to which it has been subjected are identical from one end of the region to the other and innumerable transitions are presented. It is difficult to estimate the areas occupied by the metamorphic rocks of the Coast Ranges, because the occurrences are extremely irregular. A moderate estimate of the exposures between Clear Lake and New Idria, which consist of holocrystalline metamorphic rocks, sandstones in which recrystallization has made considerable progress, phthanites, and serpentine, is 3,000 square miles. Large areas, covered by late Cretaceous and Tertiary stra...


Imprint: General Books LLC
Country of origin: United States
Release date: February 2012
First published: February 2012
Authors: Geological Survey
Dimensions: 246 x 189 x 10mm (L x W x T)
Format: Paperback - Trade
Pages: 192
ISBN-13: 978-1-235-67569-0
Barcode: 9781235675690
Categories: Books
LSN: 1-235-67569-6

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