File:Eleventh annual report of the United States Geological and Geographical Survey of the Territories - embracing Idaho and Wyoming - being a report of progress of the exploration for the year 1877 (1879) (14780996082).jpg

Identifier: eleventhannualre00hayd (find matches)
Title: Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877
Year: 1879 (1870s)
Authors: Hayden, F. V. (Ferdinand Vandeveer), 1829-1887 United States. Dept. of the Interior Geological Survey (U.S.)
Subjects: Geology Geology Paleontology Paleontology
Publisher: Washington : G.P.O.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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rifer f Rlwmbopora ? Clionetes 1 Syr-ingopora ? These fix the age of the strata as Carboniferous beyond doubt. It is probable that a fault extends along this eastern side of the range.The range has been uplifted with a force that has thrown its componentrocks into the sharpest of folds. If not a fault we would have to sup-pose the uplift to have taken place in Pre-Cretaceous time, which is notat all probable. The regular front presented by the range also im-presses one with the fact of the presence of a fault. At the head of Sickle Creek, in limestones that are cherty, I foundgood specimens of Productus multistriatus. They occur in blue lime-stones just above a layer of quartzite. The structure here is somewhatobscure, but I think the head of Sickle Creek is on the line of an anti-clinal fold which continues southward, soon becoming very sharp, andwith the eastern side of the fold removed and perhaps complicated bya fault. This is rendered probable from the fact that Glacier Creek has
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peale.1 DESCEIPTIVE GEOLOGY—SALT RIVER RANGE. 547 its head opposite Sickle Creek, and flows directly north in a canon-likevalley, which, is on the line of what would he the fault, if extended.Opposite the pass the crest of the range is the edge of a nionoclinalfold, or what appears to he a nionoclinal, for at this point there maybe an obscure anticlinal, of which the upper members of the easternhalf are removed. The western members present a bluff face about 400to 600 feet high, in which is the following general section, beginning atthe base: Section No. 13. 1. Black shales. 2. Massive limestones. 3. Interlaruinated limestones and shales; some of the latter are probably arenaceous. 4. Reddish limestones and shales. 5. Interlaminated limestones and shales, like those of No. 3; but probably more arena- ceous. At the base of layer Ko. 2 occurs Productus multistriatus. It isthis layer that preserves the fold just east of the range. East of thisthe upper bed appears to be a quartzite, an

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