Geology of the Owl Creek Mountains; With Notes on Resources of Adjoining Regions in the Ceded Portion of the Shoshone Indian Reservation, Wyoming (Paperback)

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. 1906 Excerpt: ...feature in the main uplift is its greatly diminished altitude southwest of Thermopolis, where it is crossed by the road to Lander. West of this depression, which is not only structural but topographic, rises the most elevated portion of the uplift, marked by a long belt of high granite ridges. Black Mountain, at the west end of the range, is due to local doming, or increase of uplift. The long western slope of the main anticline, where it is crossed by the canyon of Bighorn River, is a notable feature. To the west this long monocline develops into an anticline and syncline, the former pitching down very steeply at the big bend in Red Creek. The anticline at Thermopolis is due to a sharp upturn on the general northern slope of the uplift. The faults are of various lengths and except the series of block faults in the vicinity of Bighorn Canyon develop in the steeper portions of the upturned strata. One of the most prominent faults extends along the northwest side of the range, crossing South Fork of Owl Creek near longitude 109 and developing into a steep upturn south of Embar. A branch of this displacement crosses the range east of Phlox Mountain and extends along its southern side for some distance to longitude 108 30', where it passes beneath "Bridger" beds. Half a mile west of this point it has a vertical displacement of 7,000 feet, bringing granite into contact with the upper portion of the Pierre shale. REGION ABOUT THERMOPOLIS. The principal structural features in the vicinity of Thermopolis are shown in section 6 of PI. XI. To the south there is a gentle monoclinal slope from the summit of the Owl Creek Mountains into a syncline, the axis of which crosses Bighorn River half a mile south of Thermopolis. On the higher mountain slopes this mono...