 | | Report (issue) | | Sequence Along Coal Creek to Idaho Springs Formation Front Range, Colorado By JOHN D. WELLS, DOUGLAS M...____ Boulder Creek Granite and the quartz monzonite_ __________-__-__---_----_--_-_---_-Boulder Creek...1. Index maps of the Coal Creek area, Eldorado Springs, Ralston Buttes, and Blackhawk quadrangles..-_________...andalusite and cordierite. 12 4. Triangular diagram of Boulder Creek Granite.______________________ 13 5. Triangular...SEQUENCE ALONG COAL CREEK TO IDAHO SPRINGS FORMATION, FRONT RANGE, COLORADO By JOHN D. WELLS, DOUGLAS M |  | | Journal (article/letter/editorial) | | PRECAMBRIAN ROCKS OF THE HALL VALLEY AREA, FRONT RANGE, COLORADO BY ERNEST E. WAHLSTROM AND OK JOON KIM ABSTRACT...The Hall Valley area, in northwestern Park County, Colorado, contains foliated highgrade Precambrian metamorphic...argument against continued use of the terms Idaho Springs formation and Swandyke gneiss for the metasedimentary...migmatization and granitization. (7) A body of Boulder Creek granodiorite was intruded into the northeast...Granitic rocks 1230 Migration of elements 1230 Boulder Creek granodiorite and Silver Plume granite 1233 |  | | Report (volume) | | Part of the Morrison Quadrangle Jefferson County, Colorado GEOLOGICAL SURVEY BULLETIN 1251-E Geology...Part of the Morrison Quadrangle Jefferson County, Colorado By D. J. GABLE CONTRIBUTIONS TO GENERAL GEOLOGY...rocks along the mountain front due west of Denver, Colorado UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON...PART OF THE MORRISON QUADRANGLE JEFFERSON COUNTY, COLORADO By D. J. GABLE ABSTRACT The Morrison quadrangle...This sequence, which is typical of the Idaho Springs Formation, was intruded, in Precambrian time, by |  | | Report (issue) | | QlJADRANGLE (TOGETHER 'VITH THE EMPIRE DISTRICT) COLORADo· BY JOSIAH E. SPURR AND GEORGE H. GARREY WITH..................._.......... . Distribution in Colorado ................................................. . . . . . . . . . . . . . . . . . . . 97 Idaho Springs auriferous area. __ ............. _.. _. _...._,_........................ 102 Extension from Boulder beyond Leadville .. , ...... _._._........................................... . 102 Ores in Boulder County.............. . . . . . . . . . . . ...... |  | | Report (issue) | | Washington Zinc ore, Friedensville, Pa. Banded iron-formation, Palmer, Mich. 6. Ribbon asbestos ore, Quebec...Peninsula, Mich. 10. Porphyry molybdenum ore, Colorado 11. Zinc ore, Edwards, N.Y. 12. Manganese nodules...Botryoidal fluorite ore, Poncha Springs, Colo. 14. Tungsten ore, North Carolina Rutile in Precambrian Sillimanite-Quartz...Gneiss and Related Rocks, East-Central Front Range, Colorado By SHERMAN P. MARSH and DOU1GLAS M. SHERIDAN GEOLOGY...Geologic and geochemical study of rutile-bearing rocks in Colorado and a description of their occurrence |  | | Report (issue) | | Geology of Precambrian Rocks Central City District Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 474-C Prepared... Geology of Precambrian Rocks Central City District Colorado By P. K. SIMS and D. J. GABLE SHORTER CONTRIBUTIONS...1918Geology of Precambrian rocks, Central City district, Colorado, by P. K. Sims and D. J. Gable. Washington, U...district, Colorado. 1964. (Card2) 1. Geology, Stratigraphic Pre-Cambrian. 2. Geology Colorado Gilpin Co...Gilpin County, Colorado. 2. Geologic sections of the Central City district, Gilpin County, Colorado. 3. |  | | Report (volume) | | (A) Geology of Precambrian rocks, Idaho Springs district, Colorado, by Robert H. Moench. (B) Geology...and iron content of rocks from the Red Mountain Formation, Alabama, by Richard P. Sheldon. (E) Investigations... Geology of Precambrian Rocks, Idaho Springs District, Colorado By ROBERT H. MOENCH CONTRIBUTIONS...of the Idaho Springs district____________ In pocket 2. Geologic sections of the Idaho Springs district...mapped by present and previous workers in the Idaho Springs district ____________________ ----- ________ |  | | Journal (article/letter/editorial) | | from Precambrian pegmatites in the l'ront Range, Colorado, have been converted to orthoclase in a zone around...ocv The area studiedlies some 15 miles west of Boulder in the Front Range of Colorado.In this region the...Precambrian Boulder Creek granite and the schists and gneissesof the Idaho Springs Formation. This crystalline...contacts toward the surrounding Idaho Springs Formation. This formation is derived from predominantly sedimentaryrocks...pegmatites were formed throughout the Idaho Springs Formation. On approaching the contact of the Laramide |  | | Report (volume) | | Geology of the Eldorado Springs Quadrangle Boulder and Jefferson , Counties, Colorado C_-J / By JOHN D. WELLS...__________________________ Boulder Creek Granodiorite__________________________ Inclusions in the Boulder Creek Granodiorite_________...Sandstone_____--__--__-_-___---____________ Lykins Formation.__________________________________ Mesozoic r...rocks__________________________________________ Ralston Creek Formation.. __________________________ Morrison Formati...ILLUSTRATIONS Page PLATE 1. Geologic map of the Eldorado Springs quadrangle..___.__In pocket FIGURE 1. Index map |  | | Report (issue) | | METAMORPHIC ROCKS OF THE CENTRAL FRONT RANGE. COLORADO By Dolores J. Gable ' Edited bv William. D....35 EARLY PROTEROZOIC PALEOGEOGRAPHY OF NORTHERN COLORADO........................ 3 6 REGIONAL STRUCTURE...Records Section, Denver Federal Center, Denver, Colorado] Page Plate 1. Geologic map of the Proterozoic...Range, Colorado ......... in pocket 2. Sample locality map of the central Front Range, Colorado.........20. 21. 22. 23. Index map of the Front Range, Colorado.............................................. |  | | Report (volume) | | Deposits of the Upper Blue River Area Summit County Colorado • By QUENTIN D. SINGEWALD . GEOLOGICAL SURVEY...Prepared in cooperation with the Colorado Geological Survey Board and the Colorado Metal Mining Fund UNITED...________________ ------ -··· ___________ --- _ Idaho Springs formation ____________________ .. ______________...and sections of the upper Blue River area, Summit County, Colo ______________________________ In pocket...DEPOSITS OF THE UPPER BLUE RIVER AREA, SUMMIT COUNTY, COLORADO BY QUENTIN D. SINGEWALD ABSTRACT The |  | | Journal (article/letter/editorial) | | 2000 Lakeshore Drive, New Orleans, Louisiana 70148, USA Sarah L. HANSON Geology Department, Adrian College... 110 S. Madison Street, Adrian, Michigan 49221, USA Alexander U. FALSTER and Karen L.WEBBER Department...2000 Lakeshore Drive, New Orleans, Louisiana 70148, USA Abstract Pegmatites enriched in the rare-earth elements...along a southwestern trend from Wisconsin through Colorado to Arizona. Four widely geographically spaced...South Platte (SP), in Colorado, circa 1.6 Ga Trout Creek Pass (TCP), also in Colorado, and circa 1.5 Ga Mojave |  | | 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 |  | | Journal (article/letter/editorial) | | northeasterly-trending continentul Figure 2. Geologic map of the Colorado Front Range showing the Precambrian metamorphic...Karistrom 1978; Lanthier 1978). Farther south in Colorado, sediments accumulated in decper-water rocks formed...Survey into “Early, Middle, and Late” Eras. In Colorado we because of the subsequent folding and overthrusting...subduction zone and possibly the creation Era in Colorado and Wyoming of a volcanic island arc. Carpenter...perhaps be the Phillipine island arc, and Jack Colorado show two major rock groups with different ages |  | | Report (volume) | | . 234 " y { " ,-t .. .~,:",. I " , COLORADO "or.! _ +, (~ STATE OF .~ :'(' COL~ADO /... BULLETIN 40 RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BlaLlllGRAPHY by James L. Nelson-Moore,...Energy COLORADO GEOLOGICAL SURVEY DEPARTMENT OF NATURAL RESUURCES STATE OF COLORADO DENVER, COLORADO 1978...ete 11 st r ng of rad i aaet 1ve occurrences 1n Colorado, with a comprehensive blbi iography and bibliographic...association of radium, uranium. and vanadIum on the Colorado Plateau sparked several periods of exploratIon |  | | Report (issue) | | Some High-Grade Cordierite Gneisses, Front Range, Colorado Dolores J. Gable U.S. Geological Survey, Denver...SOCIETY OF AMERICA, INC. Colorado Building P.O. Box 1719 Boulder, Colorado 80302 Printed in the United...65 65 66 67 ... Vlll CORDIERITE GNEISSES, COLORADO FRONT RANGE Factors determining the mineral assen1blages...75 77 81 85 FIGURES l. Map of Front Range, Colorado ............... ................. .......... ...cordierite-bearing rocks in central part of Front Range, Colorado ................................. ....... ... |  | | Report (volume) | | Minerals of Colorado: A 100- Year Record By EDWIN B. ECKEL GEOLOGICAL SURVEY BULLETIN 1 1 14 A...knowledge____________________________________ Future of Colorado mineralogy______________________________________...mineral localities and metallic mineral deposits of Colorado ________________________________ In pocket III...mineral localities and metallic mineral deposits of Colorado, has not been included in this reprint. Many of...especially Fischer and others, 1946). MINERALS OF COLORADO: A 100-YEAR RECORD By EDWIN B. EcKEL ABSTRACT |  | | Report (volume) | | Geology and Hydrology, Front Range Urban Corridor, Colorado By FELICIE CHRONIC and JOHN CHRONIC GEOLOGICAL...Corridor. It was compiled at the University of Colorado, funded by the U.S. Geological Survey, and is...Institute bibliographies, as well as those of the Colorado Geological Survey. Most of the material listed...Federal Center, the Colorado Geological Survey office in Denver, the University of Colorado Library, or the...the Colorado School of Mines Library. These are available at the school where they were written. Microfilm |  | | Book | | mid-1957, of vvhich 70% is in New Mexico, 16% in Colorado, Utah, and Arizona, and 8% in Wyo1ning. These...siliceous and Ruoritic types, and the oxidized Colorado Plateau deposits are desc1ibed vvith those that...origin, e.g., Blind River, \i\litwatersrand, and Colorado Plateau. The writer has attempted to present equitably.... . . . . . . . . . . . . . . . . . . . . . . Colorado Plateau . . . . . . . . . . . . . . . . . . ..... . . . . . . . . . . . . . . . . . . . . . . Colorado . . . . . . . . . . . . . . . . . . . . . . . |  | | Report (volume) | | Monazite Concentrations Central City District Colorado GEOLOGICAL SURVEY BULLETIN Prepared in part...Monazite Concentrations Central City District Colorado By E. J. YOUNG and P. K. SIMS GEOLOGY AND ORE...DEPOSITS, CLEAR CREEK, GILPIN, AND LARIMER COUNTIES, COLORADO GEOLOGICAL SURVEY BULLETIN 1032-F Prepared...Generalized geologic map of the Central City district, Colorado.___________________________________________ 67...DEPOSITS, CLEAR CREEK, GILPIN, AND LARIMER COUNTIES, COLORADO PETROGRAPHY AND ORIGIN OF XENOTIME AND MONAZITE |  | Collins, Donley S., Cobban, Robert R., Foord, Eugene E., Murphy, Jack A. (1989) Bibliography for update and revision of U.S.G.S. Bulletin 1114, Minerals of Colorado -- a 100 year record, by Edwin B. Eckel, Part A - Paper copy --Bibliography data file disks. Open-File Report Vol. 1989 (89-206) US Geological Survey doi:10.3133/ofr89206a | Report (issue) | | Survey Denver, Colorado Department of Geology, Denver Museum of Natural History Denver, Colorado NOTE FOR...revision of U.S.G.S. Bulletin 1114, Minerals of Colorado A 100 year record, by Edwin B. Eckel By Donley...Prepared in cooperation with Friends of Mineralogy - Colorado Chaptar, and the Denver Museum of Natural History...references dealing with the mineralogy of the state of Colorado. It is part of a more than 10 year effort to update...and revise U.S.G.S. Bulletin 1114, Minerals of Colorado: A 100 year record, by Edwin B. Eckel (1961). |  | Sheridan, Douglas M., Maxwell, Charles Henry, Albee, Arden Leroy, Van Horn, Richard (1967) Geology and uranium deposits of the Ralston Buttes district, Jefferson County, Colorado, with sections on Paleozoic and younger sedimentary rocks. Professional Paper 520. US Geological Survey doi:10.3133/pp520 | Report (issue) | | Deposits of the Ralston Buttes District Jefferson County, Colorado By DOUGLAS M. SHERIDAN, CHARLES H. MAXWELL...Igneous rocks _________________________ ___ _ Boulder Creek Granodiorite _____________._ Quartz monzonite...___ _ ~ Pennsylvanian and Permian: Fountain Formation ___________________________ _ Permian: Lyons Sandstone..._____________ _ Permian(?) and Triassic(?): Lykins Formation ____________________ --· ___ _ Mesozoic rocks...________________ _ Ralston Creek Formation ___________ _ Morrison Formation _______________ _ Cretaceous |  | | Report (issue) | | Crystalline Rocks, Park and Jefferson Counties, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 608-B General...Crystalline Rocks, Park and Jefferson Counties, Colorado By C. C. HAWLEY and R. A. WOBUS GEOLOGY AND ORE...TARRYALL REGION, PARK AND JEFFERSON COUNTIES, COLORADO GEOLOGICAL SURVEY PROFESSIONAL PAPER 608-B...Tarryall region, Park and Jefferson Counties, Colorado) (Geological Survey Professional Paper 608-B)...Stratigraphic Pre-Cambrian. 2. Geology-Colorado Park Co. 3. Geology Colorado Jefferson Co. 4. GraniteColorado |  | | Journal (issue) | | should give a clue to their formation.”’ Illustrated 16 HIsTORY OF THE BOULDER REGION by Robert E. Riecker...Pre-Cambrian, when the oldest rocks in the Boulder, Colorado, area were formed. An ancient sea (the shores...other. The largest sphere exhibited was made of Colorado jewel marble and weighed approximately 100 pounds...eration will be held in Denver next June, with the Colorado Mineral Society as hosts to both the American...it was in the last ROBERT E. RIECKER, of Boulder, Colorado, pre sents an abridgement of his paper recently |  | | Journal (issue) | | Contents For August, 1935 __ __ ,,. PAe& The Boulder, Colorado, Tungsten Area. By Ronald L. Ives ....................... 12 3 Lake City Mining District, Colorado. By David Seaman ........... 124 Club and Society...Minerals Association 1935 WHOLE No. 50 The Boulder, Colorado, Tungsten Area By RONALD L. IVES Since the...mining mation is pre-Cambrian, with three, in Colorado, those who panned the and possibly four mineralizations...mineralizations, the creeks of the high couutry in Boulder last being Tertiary. The tungsten minCounty ,vere |
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