. Annual report. 1st-12th, 1867-1878. Geology. 16 GEOLOGICAL SURVEY OF THE TERRITORIES. satch group about the sources of Ogden Creek; then the low Jurassic ridges, inclining 10^ to lo^*, gradually passing down into sandstones, quartzitesjthen arenaceous limestones,changing gradually to pure massive limestones of Carboniferous age. As we pass down the caGon from Ogden Valley, or, as it is named on our maps, Ogden Hole, we observe the Carboniferous limestones rising like high, nearly vertical, walls on either side, at first inclining about 8^, within ten miles dipping 20- to 3(P, and 1,500 to 2,
. Annual report. 1st-12th, 1867-1878. Geology. 16 GEOLOGICAL SURVEY OF THE TERRITORIES. satch group about the sources of Ogden Creek; then the low Jurassic ridges, inclining 10^ to lo^*, gradually passing down into sandstones, quartzitesjthen arenaceous limestones,changing gradually to pure massive limestones of Carboniferous age. As we pass down the caGon from Ogden Valley, or, as it is named on our maps, Ogden Hole, we observe the Carboniferous limestones rising like high, nearly vertical, walls on either side, at first inclining about 8^, within ten miles dipping 20- to 3(P, and 1,500 to 2,000 feet in thickness. In these limestones are some remarkable illustrations of the folding of the strata, (Fig. 2.) In one locality there is a Fig. WEDGE OF LIMESTONE, OGDEN CANON. group of strata, perfectly cross-sectioned by the stream, 300 feet long and 200 feet high at the thickest end, in the shape of a huge wedge. Underneath these limestones comes a yellowish-gray quartzite, which forms a portion of a ridge inclining 20° to 25^. A small gulch inter- venes, and the next ridge runs up like a cone with a dip northeast 55°, and the strata are brought out remarkably clear, with a height of 1,500 to 2,000 feet; beneath the quartzite is another bed of brittle limestone of better quality than the other, of a bluish-gray color, passing down into a steel-gray. The coarse portion is quite slaty. It is this bed that furnishes the material for burning into lime. These limestones incline 30^, and are about 1,500 feet in thickness. The next bed is composed. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological and Geographical Survey of the Territories (U. S. ); United States. General Land Office; United States. Dept. of the Interior. Washington, Govt. Print. Off.
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