Download torrent Professional Paper - United States Geological Survey Volume 27

Download torrent Professional Paper - United States Geological Survey Volume 27

Professional Paper - United States Geological Survey Volume 27. Geological Survey

Professional Paper - United States Geological Survey Volume 27
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Author: Geological Survey
Number of Pages: 58 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130243246
File size: 30 Mb
Download Link: Professional Paper - United States Geological Survey Volume 27
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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. 1904 Excerpt: ...products. Many of these rocks contain microscopic tourmaline. TERTIARY GRAVELS. The great flows of the Columbia River lava dammed the old drainage ways to present elevation of about 3,000 or 3,200 feet. The natural result was heavy accumulations of gravels in the lower reaches of the Clearwater streams. Remaining benches of such gravels are beautifully developed in the Elk City mining district (p. 91), where the highest of these attains an elevation of 4,500 feet. Similar conditions existed, closer to the valley, at Pierce, where the highest remaining gravel benches reach elevation of 3,300 to 3,500 feet (p. 102). Remains of gravels are also found on the ridge between Lolo and Musselshell creeks at an elevation of 3,700 feet. IILACIATIO.V. The large confluent ice sheet which once covered the whole of the Bitterroot Range has been described in some detail on a previous page (p. 51). Within the Clearwater Mountains no evidence of such general and widespread glaciation is found, dite of course to the fact that the mountains rarely attain an elevation equal to that of the Bitterroots. The glaciation in the Clearwater Mountains is confined to a few isolated localities, and evidences of its existence appear wherever any considerable area of country exceeds 8,000 feet in elevation. Beginning on the north the first center of glaciation is met at Rhodes Peak on the Lolo Ridge, from which doubtless small glaciers extended in several directions. Going west another local center from which small glaciers radiated appears at Bald Mountain and Castle Butte. Finally, a few miles farther west on the slopes of Rocky Ridge three or four smaller glaciers appear to have descended the streams leading up to that peak. The ridge between Lochsa and Selway forks of the Clearwater is...

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