Items related to Report Upon the Colorado River of the West
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. 1861 Excerpt: ...white of the stratified, and brown and purple of the erupted rocks. The canon itself presented the most varied and interesting scenery we had met with, its walls being particularly ragged and picturesque in outline, and the colors such as to produce the most unusual and surprising effects. The southern part of the canon is cut through the trap and metamorphic rocks just mentioned; the gateway by which we entered it being composed of trap and a massive and highly metamorphosed conglomerate, which varies in color from umber brown to blood red. The most elevated portion of the chain through which the canon passes is composed of granite and porphyry, and is apparently older than the hills of trap and metamorphosed Tertiary rocks which skirt it on either side. The Needles themselves are formed of purple porphyry and trachyte. Our Camp 40 was located midway of the canon. The highest summits in the vicinity are composed, on the north and west, of granite; on the south and east, of porphyry. The lower hills, immediately adjacent to camp, consist of metamorphic conglomerate, or rather breccia, containing firmly cemented angular fragments of granite, similar to that of the neighboring summits, and probably derived from them, with intruding masses of purple and brown trachyte and porphyry. These latter materials, with green volcanic tufa, form the picturesque hills which rise from the water's edge on the left bank. Some of the trachytes contain numerous scales of mica, (phlogopite,) and masses of black oxide of manganese. That part of the canon which lies north of Camp 40 is formed by the passage of the river through a distinct mountain range, one of several (four or five) which compose the chain. This range is much higher west than east of the river, and borders the ...
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- PublisherRarebooksclub.com
- Publication date2012
- ISBN 10 1130257703
- ISBN 13 9781130257700
- BindingPaperback
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