Bulletin Volume 696-700 download pdf

Bulletin Volume 696-700. Geological Survey

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Author: Geological Survey
Number of Pages: 698 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781232451631
Download Link: Bulletin Volume 696-700
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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. 1919 Excerpt: ...it appears to range from 3 to possibly 15 feet. The latter depth, however, if reached at any place is exceptional, and the average depth probably does not much exceed 3 feet. On the theory that the deposits were interbedded, a short tunnel was run into the hill 30 or 40 feet below one of the deposits, but it encountered only a friable sandstone. The gypsite is of a creamy or buff color and can be worked with a pick and shovel--at many places with a shovel alone. At some points it has been partly dissolved and reprecipitated, so that it is considerably hardened, but the hardened part is not more than a few inches thick and can be readily worked with a pick. The gypsite is easily crushed and most of it coidd be handled by screening without crushing. Ordinarily the gypsite is covered by a few inches of soil, below which for a few inches it is very free from foreign matter, containing a few pebbles of the same sort as those found in the sandstone. These pebbles increase in number downward. At a depth of 2 or 3 feet they become abundant, and at a greater depth the gypsite forms the smaller part of the mass, the larger part being the sandstone of the underlying rock. In the gulches there are places to which the gypsite has been washed from the ridges by freshets and in which it now forms deposits several feet thick, though sufficient prospecting has not been done to show their exact dimensions. There is almost no gypsite on the sides of the hills, its absence being due probably to its solution and washing away by rain water. The gypsite remains on the tops of the hills, but on their sides, which receive not only the falling rain but the run-off from the upper parts of the hills, it is dissolved and carried away. Occasional torrential rains carry the gypsite from ...

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