File:Annual report. 1st-12th, 1867-1878 (1867) (18240440799).jpg

Title: Annual report. 1st-12th, 1867-1878
Identifier: annualreport1st106geol (find matches)
Year: 1867 (1860s)
Authors: Geological and Geographical Survey of the Territories (U. S. ); United States. General Land Office; United States. Dept. of the Interior
Subjects: Geology
Publisher: Washington, Govt. Print. Off.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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110 GEOLOGICAL SUEVEY OF THE TERRITORIES. Fig. 27.
Text Appearing After Image:
the ridge toward the uorth, it is south 30^-35° west; aiij;le, 800-85°. Still higherupit is south 1*0° west; augle,850; and theu becomes, withiu a very short distance, south 10° west; angle,880-90° As we i)rogress it passes the vertical and dips northeast at a high angle, 1 which gradually decreases, the dip be- 2 coming more and more northerly until the arch is completed. At the western end of the caiion beneath the limestone, which immediately succeeds the fossilif- erous sandstone, there is a fine exposure 4 ofquartzite-'beds, the top layers of which 5 are somewhat calcareous. Then comes G a layer of conglomerate nmde up of 7 green and brown tlint pebbles, varying from the size of a walnut to eight inches in diameter. Associated with these peb- 8 bles are geodes of quartz, some of which contain calcite. The best section of all the beds ex- posed in Spring Caiion is obtained in the center of the caiion at the point marked in Fig. 20 by the dotted line S. We commence at the top of the hill, which rises 1,100 feet above the level of the creek. The first bed we notice is a highly metamorphic-looking quartzite, '^ which cro]>s out along the summit of I'i the hill. Its general color is a dull red, '"' passing in places into a dull purple and j(5 again becoming light gray, with bright red and yellow streaks. Some of them ^^17 have an almost ilinty fracture. Wq esti- mated the thickness of the beds at 50 feet. Kcxt below these beds are quartz- |«o ites and light gray sandstones followed by conglomerates, in the lower layers of which the pebbles are very fine'. The conglomerates are followed bv brown limestones and sandstones, the weath- ering of which gives a red tinge to the soil. These beds are succeeded by fine, dark-gray calcareous sandstones, which break into iamiute of from two to four :53 inches thickness. Next to these are the coarse-grained fossiliferous sandstones that I have ref'erretl to above, (layer No. 7 in the section,) containing frag- ments of Ostrca and C'amptonecies. They might almost be called siliceous lime- stones from the amount of lime they contain, but they are made up of coarse grain.s of sand and more properly de- serve the name of sandstones. Intttr-

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