 | | Report (issue) | | MINERAL RESOURCES OF THE RAWAH WILDERNESS, LARIMER COUNTY, COLORADO By R. C. Pearson, M. E. McCallum, and...Wilderness, Roosevelt National Forest, Larimer County, Colorado. ii SUMMARY The mineral resource potential...southern Medicine Bow Mountains in north-central Colorado. The crest of the Medicine Bow Mountains is sharp...two-thirds of the area. Structurally, the Medicine Bow Mountains in Colorado comprise the southern end of a n...was largely responsible for shaping the Medicine Bow Mountains and positioning them relative to adjacent |  | | Report (issue) | | PRECAMBRIAN CRYSTALLINE ROCKS OF THE MEDICINE BOW MOUNTAINS, NORTH-CENTRAL COLORADO by M. E. McCallum and A. L...Reconnaissance mapping in the Medicine Bow Mountains of northern Colorado has revealed two plutons that...in southeastern Wyoming and adjacent areas of Colorado. This pluton is referred to as the Boswell Creek...The Front Range immediately east of the Medicine Bow Mountains (fig. 1) has long been considered a U-Th...Precambrian granitoid rocks in the Colorado Medicine Bow Mountains. This objective was accomplished utilizing |  | | Journal (article/letter/editorial) | | Province, USA Robert S. Houston Geology Department, Universityof Wyoming, Laramie, WY 82070, USA (Received...near plate margins of the Archean Wyoming Province, USA. In: G. Gadl and K. Schulz (Editors), Precambrian...Trans-Hudson fold belt, and on the south by the Colorado Proterozoic Province where Proterozoic island...WY, 82070, USA. 0301-9268/92/$05.00 margin is exposed in the Sierra Madre and Medicine Bow Mountain uplifts... ~ l JBCA ]KO ", f / /~~ IT ~TLE BELT MOUNTAINS -\ / f / / .,.,..r"v,(R°7 ! ..: | x |  | | Report (issue) | | Proterozoic Geology of the Southern Rocky Mountains DISCARD Edited by Jeffrey A. Grambling Department...Inc. 3300 Penrose Place, P.O. Box 9140, Boulder, Colorado 80301 GSA Books Science Editor Campbell Craddock...Data Proterozoic geology of the southern Rocky Mountains / edited by Jeffrey A. Grambling, Barbara J. Tewksbury...presented at a 2-day symposium, held in Durango, Colorado, May 1984, in conjunction with the Rocky Mountain...Stratigraphic—Pre-Cambrian—Congresses. 2. Geology-Rocky Mountains Region—Congresses. I. Grambling, Jeffrey A. II |  | | Report (issue) | | Basement in Colorado GEOLOGIC A I, Rock Units of the Precambrian Basement in Colorado By OGDEN TWETO...TWETO GEOLOGY OF THE PRECAMBRIAN BASEMENT IN COLORADO U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1321-A...igneous rocks in outcrop and the buried basement in Colorado UNITED STATES GOVERNMENT PRINTING OFFICE...1912-1983 Rock units of the Precambrian basement in Colorado. (Geological Survey Professional Paper ; 1321-A)...Geology, Stratigraphic Pre-Cambrian. 2. Geology Colorado. QE653.T9 1986 551.7'1'09788 I. Title. For sale |  | Snyder, George L., Hausel, W. Dan, Klein, Terry L., Houston, Robert S., Graff, Paul J. (1989) Precambrian Rocks and Mineralization, Southern Wyoming Province - Hartville Uplift to Copper Mountain Area, Wyoming July 19-25, 1989. Field Trip Guidebook T332. American Geophysical Union | Report (issue) | | (Snyder) 8 4 12 Laramie Mountains geologic summary (Snyder) Laramie Mountains stop descriptions (Snyder...and Hausel) 20 Medicine Bow Mountains geologic summary (Houston) Medicine Bow Mountains stop descriptions...and Graff) 25 25 Seminoe Mountains geologic summary (Klein) Seminoe Mountains stop descriptions (Klein...References cited 1U .S. Geological Survey, Denver, Colorado. ~e Geological Survey of Wyoming, Laramie, Wyoming...and Hausel): Field trip Visits central Laramie Mountains with geology stops in Archean basement, metasedimentary |  | | Journal (article/letter/editorial) | | Laramide age: the Sierra Madre, Medicine Bow Mountains, and Laramie Mountains (Fig. 2). The boundary is marked...ARCHEAN GNEISS AND GRANITE / ~ THRUST FAULT4 b ~ MEDICINE BOW ,,=,,,,,"-"SHEAR Z O N E ~ &~ SIERRA MADRE...~CHEYENNE @QO00 .... WYOMING............ 11 COLORADO >>:<<.>>:4 NORTH PARK RANGE( STEAMBOAT, SPRINGS...in the Sierra Madre and M e d i c i n e B o w Mountains. 418 shear zone named the Cheyenne belt (Houston...belt include a greenstone belt in the Laramie Mountains consisting primarily of volcanics (Graff et al |  | PATEL, , FROST, , CHAMBERLAIN, , SNYDER†, (2001) Proterozoic metamorphism and uplift history of the north-central Laramie Mountains, Wyoming, USA. Journal of Metamorphic Geology, 17 (3) 243-258 doi:10.1046/j.1525-1314.1999.00201.x | Journal (article/letter/editorial) | | uplift history of the north-central Laramie Mountains, Wyoming, USA S . C . PATE L* , B . R . F R OS T , K...of Wyoming, Laramie, WY 82071, USA A B S T RA C T The Laramie Mountains of south-eastern Wyoming contain...a response to thrusting associated with the Medicine Bow orogeny at c. 1.78–1.76 Ga. At this time, the...Federal Center Mail Stop 913, Denver, CO 80225, USA. © Blackwell Science Inc., 0263-4929/97/$14.00 Journal...Laramie Range, the eastern-most range of the Rocky Mountains of Wyoming, exposes a 200 km long swath of Precambrian |  | | Journal (article/letter/editorial) | | University of Wyoming, Laramie, Wyoming 82071, USA Abstract. An inverted metamorphic gradient associated...Geoscience, University of Nevada, Las%egas, Nevada 89154, USA. high shear stresses are postulated. Up-dip advection...the north and the Proterozoic terranes of the Colorado Front Range to the south (Fig. 1) (Hills & Houston...PROVINCE I I I ' vO/n 0 I - II -- . Medicine Bow INDEX MAP Fig. 1. Location of the Cheyenne...steeply southeast dipping and, in the eastern Medicine Bow Mountains, define a south-facing homocline. Well-developed |  | | Journal (article/letter/editorial) | | Southward from the anorthosite--syenite complex into Colorado, the Range is underlain chiefly by the Sherman...similar gneiss in the southern Medicine Bow Mountains and in the Colorado Front Range, where they are dated...Mullen Creek--Nash Fork shear zone in the Medicine Bow Mountains, also is the boundary between ensialic...Laramie R a n g e o n the east, the M e d i c i n e Bow M o u n t a i n s *Present address: Department of... on the west. A detailed geochronology of the Medicine Bows has been published (Hills et al., 1968), |  | Hedge, Carl E., Harrison, Jack Edward, Houston, R.S., Tweto, O.L., Peterman, Z.E., Reid, R.R. (1986) The Precambrian of the Rocky Mountain region. Professional Paper 1241d. US Geological Survey doi:10.3133/pp1241d | Report (issue) | | . . . . . . . . . . . . Proterozoic rocks of Colorado and southern Wyoming . . Crystalline basement...Beartooth Mountains, Montana . . . . . . . 3. Geologic map of the Precambrian of Colorado and southernmost...ages of approximately 1,670-m.y.-old plutons in Colorado . . . . . . . . . . . . . 5. Diagram of estimated...this terrane 2,500 to 2,760 million years ago. In Colorado, a thick sequence of volcanic and sedimentary...1,400 million years ago and again, in central Colorado, 1,015 million years ago. Shelf-type sedimentary |  | | Journal (article/letter/editorial) | | near the Bear Trap corundum deposit in Madison County. Shortly thereafter several green quartzites containing...chromian muscovite were found in the southern Ruby Mountains, east of Dillon, in Madison and Beaverhead Counties...the Cherry Creek group south of Ennis, Madison County (Heinrich and Rabbitt, 1960). The completelist...Range-Centennial Valley Blacktail Range Ruby Mountains Southern Tobacco Root Mountains Gallatin River-Madison Canyon...Canyon Cherry Creek Beartooth Mountains No, of occurrences 8 I I I The area encompassedby these occurrencesis |  | | Journal (article/letter/editorial) | | Geochronology of the Medicine Bow Mountains, Southeastern Wyoming Abstract: The Medicine Bow Mountains of Wyoming...S. Geochronologic Province to the south. The mountains are crossed by a major northeast-trending shear...southeast of the major shear zone in the Medicine Bow Mountains, nor has any been found in nearby areas...one or more episodes of metamorphism in the Medicine Bow area between 1600 and 1455 ± 40 m.y. ago. We...miogeosynclinal sedimentary rocks in the northern Medicine Bow Mountains, roughly correlative with Animikie and |  | | Report (issue) | | succession of metasedimentary rocks of the Medicine Bow Mountains, southeastern Wyoming T9 Contents III...Distinct subprovinces such as basement uplifts of Colorado and southeastern Wyoming, is an are present in...north-verging Cheyenne belt, exposed in the Medicine Bow Mountains, which formed between 1.78 Ga and 1.75...the gneiss terrane. In the well-studied Medicine Bow Mountains and Sierra Madre of southeastern Wyoming...substantial part of the northern part of the Laramie Mountains (pi. 1, view B), north of the inferred northeastern |  | | Report (volume) | | Park Range Vicinity, Jackson and Routt Counties, Colorado By GEORGE L. SNYDER, U.S. GEOLOGICAL SURVEY, LOWELL...Park Range vicinity, Jackson and Routt Counties, Colorado. (Studies related to wilderness-wilderness areas)...mineral resources-Colorado--Jackson County. 2. Mines and mineral resources-Colorado-Routt County. 3. Geology-Colorado--Jackson...Geology-Colorado--Jackson County. 4. GeologyColorado--Routt County. I. Patten, Lowell L. II. Daniels, Jeffrey...Zirkel Wilderness and northern Park Range vicinity, Colorado, that are being considered for wilderness designation |  | | Report (issue) | | River Adjacent Wilderness Study Area, Jackson County, Colorado By Robert P. Dickerson 1 and John R. McDonnell...Geological Survey Denver, Colorado 2 U.S. Bureau of Mines Denver, Colorado CONTENTS Abstract........(CO-010-104) Wilderness Study Area, Jackson County, Colorado. ABSTRACT The Platte River Adjacent Wilderness...(CO-010-104) consists of 30 acres in Jackson County, Colorado, No mineral occurences, energy resources,...located 16 mi (miles) north of Walden in Jackson County, Colorado (see figure 1). It consists of 30 acres of |  | | Report (issue) | | Rocks Northeast of Steamboat Springs, Park Range, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 1041...Rocks Northeast of Steamboat Springs, Park Range, Colorado By GEORGE L. SNYDER with a section on GEOGHRONOLOGY...unstudied area of Colorado and comparison with related rocks elsewhere in Colorado and Wyoming UNITED...rocks northeast of Steamboat Springs, Park Range, Colorado. (Geological Survey Professional Paper 1041) Bibliography:...Docs, no.: I 19.16:1041 1. Intrusions (Geology) Colorado Steamboat Springs region. 2. Geology, Stratigraphic |  | | Journal (article/letter/editorial) | | garnet; ST = staurolite; KY = kyanite; SIL = sillimanite; KFS = K feldspar. Lower right inset: generalized...quartz, plagioclase, muscovite, biotite, and sillimanite, with local ~0.5–1.0 cm thick horizons of abundant...growth generations of garnet, staurolite, and sillimanite (Terry and Friberg 1990; Terry 1990), and at...PR-1. Initial sillimanite formed during decompression from the kyanite to sillimanite stability fields...fields, and prograde sillimanite formed later as sub-oriented needles after muscovite. The early and late |  | Soulliere, S.J., Toth, M.I., Bankey, V.L., Smith, S.M., Pitkin, J.A., Cookro, T.M., Robinson, Roberts L.N., Molnia, C.L., Wandrey, C.J., Law, B.E., Spencer, C.W., Barker, C.E., Dersch, J.S. (1996) Resource potential and geology of the Routt National Forest and the Middle Park Ranger District of the Arapaho National Forest, Colorado. Open-File Report Vol. 1996 (96-82) US Geological Survey doi:10.3133/ofr9682 | Report (issue) | | Unconsolidated Deposits ...................... Colorado Mineral Belt ...................................Ranger District of the Arapaho National Forest, Colorado ................... 14 Index map of studied public...Ranger District of the Arapaho National Forest, Colorado .......... 16 Index map showing mining districts...Ranger District of the Arapaho National Forest, Colorado (referred to as "the Forest" in this report) was...most of the Forest is north of the productive Colorado mineral belt, the Forest has a history of mineral |  | | Journal (article/letter/editorial) | | Institute and State University, Blacksburg, VA 24061, USA b Department of Geology, University of Helsinki,...Maryland at College Park, College Park, MD 20742, USA Accepted 11 October 2002 Abstract The Archean Wyoming...Paleoproterozoic Snowy Pass Supergroup in the Medicine Bow Mountains was deposited on the present-day southern...University, 20 Oxford Street, Cambridge, MA 02138, USA. Fax: /1-617-495-8839 E-mail address: abekker@fas...Wyoming Craton through the Sierra Madre, Medicine Bow Mountains and Hartville Uplift. The presence of carbonates |  | | Report (issue) | | the Origin of Granitic Rocks Northgate District Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 274-M Metamorphism...the Origin of Granitic Rocks Northgate District Colorado By T. A. STEVEN SHORTER CONTRIBUTIONS TO GENERAL...Geologic map of the Northgate district, Wyoming and Colorado. Geologic map of the northwest part of the Northgate...ORIGIN OF GRANITIC^ROCKS, NORTHGATE DISTRICT, COLORADO By T. A. STEVEN ABSTRACT The pre-Cambrian rocks...district on the western flank of the Medicine Bow Mountains, Colorado, consist of a gneiss, complex invaded |  | | Journal (article/letter/editorial) | | nearly 70 miles north by Vic Norris, from Lyons, Colorado, a few years after I made the discovery. Thus...South Pass greenstone belt of the Wind River Mountains in western Wyoming (Hausel 1991) and has also...Copper Mountain supracrustal belt of the Owl Creek Mountains in northwestern Wyoming (Hausel, Graff, and Albert...in the Granite Mountains, Medicine Bow Mountains, Green Mountain, Wind River Mountains, and Sierra Madre...(Hausel and Sutherland 2000). Within the Granite Mountains of central Wyoming are sev eral corundum occurrences |  | | Report (issue) | | Precambrian Petrochemistry of the Northern Park Range, Colorado, and Its Implications for Studies of Crustal Derivation... Precambrian Petrochemistry of the Northern Park Range, Colorado, and Its Implications for Studies of Crustal Derivation...GEOLOGICAL SURVEY PROFESSIONAL PAPER 1343 Studies of sillimanite-grade Proterozoic rocks, particularly mafic and...1927Precambrian petrochemistry of the northern Park Range, Colorado, and its implications for studies of crustal derivation...Park Range ..................................... Colorado ....................................... Crust-mantle |  | | Report (issue) | | quartz-pebble conglomerates, Southern Lake Superior Region, USA ...................................................conglomerates of the Black Hills, South Dakota, USA .......... J.A. Redden Application of the time and...quartz-pebble conglomerate in southeastern Wyoming, USA ..................................... R.S. Houston...Field Engineering Corporation, Grand Junction, Colorado, United States of America Abstract Precambrian...eight other areas in South Dakota, Montana, Colorado, Arizona, California, Michigan, and Wisconsin |  | | Report (issue) | | . .. . . .. . . . . . . . . . 3 8 Absaroka Mountains .. . . , . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . 33 34 Bighorn Mountains ... . . . . .. . • 4 • • • • • • • •... . . . . . . . . . . . . . . . . 54 Ferris Mountains . .. ... . . . . . . . . . .. . . ... .. ... ..... .. . . . . • ~ . . . . .. 56 56 Granite Mountains . . . . . _ . . . . . . . . . . . . . . . . .... . . . . . . . . . . . . . . . . Laramie Mountains . . . . . . . . . . . . . . . . . . . . . . . |
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