Progress-report Upon Geographical and Geological Explorations and Surveys West of the One Hundredth Meridian, in 1872: Under the Direction of Brig. Gen. A.A. Humphreys, Chief of Engineers, United States ArmyU.S. Government Printing Office, 1874 - 56 pages |
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$4 per day acres American Fork amount area covered Arizona assays show assistant astronomical average cost Beaver bullion cañon cedar Colorado connection Corps of Engineers cost of mining Cottonwood country-roads covered by mineral Creek deposits direction of lodes discovered east and west EXPLORATIONS AND SURVEYS feet field-parties foot-hills furnace G. K. Gilbert galena geological granite Hualapais hundredth meridian inches Indians interior basins irrigation labor is $4 latitude ledges Lieut limestone line from bottom longitude main vein meteorological mill mineral croppings mining labor MINING-DISTRICT mining-ledges Mormon mountains Nevada north and south notes furnished observations observatory officer parties Pioche present principal mines Provo quartzite range River routes running Salt Lake City Schell Creek range Sevier Sevier Lake Sevier River shaft silver silver-bearing slope smelting square miles stations strata supply SURVEYS WEST Territory timber topographical Toquerville trend tunnel Utah Southern Railroad Utah Territory Valley vicinity
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Page 50 - Two-thirds of the mountain ridges can be referred to this class. "2. Other ridges are uplifts limited by parallel faults (C), and to these may be assigned a few instances of isolated synclinals (D), occurring under circumstances that preclude the idea that they are remnants omitted by denudation. "3. True anticlinals (E) are very rare, except as local, subsidiary fea9 tures, but many ranges are built of faulted and dislocated rock masses (F), with an imperfect anticlinal arrangement.
Page 50 - In the latter, corrugation has been produced commonly by folding, exceptionally by faulting; in the former, commonly by faulting, exceptionally by flexure. In the latter, few eruptive rocks occur ; in the former, volcanic phenomena abound, and are intimately associated with ridges of upheaval. The regular alternations of curved...
Page 50 - ... 3. True anticlinals (e) are very rare except as local, subsidiary features, but many ranges are built of faulted and dislocated rock-masses, (/,) with an imperfect, anticlinal arrangement. Not only is it impossible to formulate these features, by the aid of any hypothetical denudation, in such a system of undulations and foldings, as the Messrs. Rogers have so thoroughly demonstrated in Pennsylvania and Virginia, but the structure of the western Cordillera system stands in strong contrast to...
Page 49 - Utah, overlooks two terminal moraines, one of which contains a lakelet at an altitude of about 9,000 feet. No traces were seen of a general glaciation, such as the Northern States experienced and the cumulative negative evidence is of such weight that Mr. Gilbert is of opinion that the glaciers of the region' referred to were confined to the higher mountain-ridges.
Page 50 - Science, November and December, 1872.) Without entering upon these, or attempting to present the material upon which they depend, I will briefly note a single conclusion in regard to the structure of the Cordilleras of the West that seems pertinent to the discussions of general orology now in progress. The sections accumulated by our geological observers admit of the following classifications : 1. Faulted monoclinals occur, in which the strata on one side of the fanlt have been lifted, while Fio.
Page 31 - ... Farm. The institution is located in Story County. Seven hundred and twenty-one acres in that and two hundred in Boone County were donated to it by individuals interested in the success of the enterprise. By act of Congress approved July 2, 1862...
Page 50 - The sections accumulated by our geological observers admit of the following classifications: A BODE P FIG. 7. "1. Faulted monoclinals occur, in which the strata on one side of the fault have been lifted, while those on the opposite side either do not appear (A), or (less frequently) have been elevated a less amount (B).
Page 50 - ... 1. Faulted monoclinals occur, in which the strata on one side of the fault have been lifted, while those on the opposite side either do not appear (a) or (less frequently) have been elevated a less amount (6). Two-thirds of the mountain ridges can be referred to this class.
Page 49 - At about the same altitude and in lat. 39° are moraines and an Alpine lake upon the flanks of Wheeler's Peak, of the Snake Range of Nevada.