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Bulletin of the United States Geological Survey (Volume 197-199).cGeological Survey
Bulletin of the United States Geological Survey (Volume 197-199)
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Author: Geological Survey
Page Count: 254 pages
Published Date: 13 Jan 2012
Publisher: General Books
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781235109553
File Name: Bulletin.of.the.United.States.Geological.Survey.(Volume.197-199).pdf
Download Link: Bulletin of the United States Geological Survey (Volume 197-199)
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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1902. Not illustrated. Excerpt: ... .surface is covered with fine yellowish silt, composed almost entirely of fragments of quartz, and not distinguishable from true a?olian soil. RESIDUAL SOILS. On the mountains of southern Idaho and on the steptoes which rise through the lava of the Snake River Plains there is usually an abundance of fine material forming a soil mantle which agrees in the nature of its constituent fragments with the rocks on which it rests. In many instances there is a gradation from fine soil, with occasional angular rock fragments into the solid rock beneath. These are typical examples of residual soils. SUMMARY. The soils of southern Idaho are of two classes--sedentary and transported. Of the transported soils, there are again two principal subdivisions--wind deposited and water deposited. Of the wind-carried or teolian soils there are two principal varieties, one consisting mainly of fine quartz sand and the other of volcanic dust and lapilli. Of the water-deposited soils there are again two varieties--those laid down in lakes, principally in southwestern Idaho, and those deposited by streams. The principal part of the soil covering the plains at a distance from the mountains and outside the canyons is of wolian origin, and consists mainly of fine quartz particles. CHEMICALLY FORMED STBAERIAL. DEPOSITS. A surface efflorescence of alkaline salts, etc.. is unknown on the Snake River Plains. In a few localities, however, on the flood plains of streams--as, for example, along the border of Snake River to the west of Shoshone Kails--the nature of the plants indicates an alkaline soil, and in a few instances white surface incrustations are formed during the summer season. These incrustations, as is well known, are due to surface evaporation. The water from below rises, owing to cap...

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