 | | Report (issue) | | Qiiartzite-Schist Sequence Along Coal Creek to Idaho Springs Formation Front Range, Colorado By JOHN D. WELLS, DOUGLAS...Boulder Creek Granite and the quartz monzonite_ __________-__-__---_----_--_-_---_-Boulder Creek Granite...the Coal Creek areaIn pocket FIGUBE 1. Index maps of the Coal Creek area, Eldorado Springs, Ralston Buttes...cordierite. 12 4. Triangular diagram of Boulder Creek Granite.______________________ 13 5. Triangular...QUARTZITE-SCHIST SEQUENCE ALONG COAL CREEK TO IDAHO SPRINGS FORMATION, FRONT RANGE, COLORADO By JOHN D. WELLS, DOUGLAS |  | | 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 ____________________ ----- ________ |  | | Report (volume) | | 931-O NICKEL DEPOSIT NEAR GOLD HILL BOULDER COUNTY, COLORADO BY E. N. GODDARD AND T. S. LOVERING Strategic............ 351 Idaho Springs formation.............................. 352 Boulder Creek granite..........Generalized geologic map of the vicinity of Gold Hill, Colorado, showing-the regional setting of the Copper King...King mine, Boulder County, Colorado..... In pocket Figure 37. Index map of Colorado showing the location... NICKEL DEPOSIT NEAR GOLD HILL, BOULDER COUNTY, COLORADO By E. N. Goddard and T. S. Levering ABSTRACT |  | | 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 portion...Granitic rocks 1230 Migration of elements 1230 Boulder Creek granodiorite and Silver Plume granite 1233 Pegmatite |  | | 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 |  | | Journal (article/letter/editorial) | | PEGMATITES OF EIGHT MILE PARK, FREMONT COUNTY, COLORADOXT E. Wrrr. HerNnrcu, Department of Mineralogy...to twelve miles west of Canon City, Fremont County, Colorado, includes about 30 square miles that lie at...separate paper. 420 PEGMATITES OF EIGHT MILE PARK, COLORADO 42r area are flanked on the east by hogbacks...granite, Idaho Springs schist, and injection gneiss. The oldest, the Idaho Springs formation, consists...formed by large scale lit-par-lit intrusion of Idaho Springs biotite schists by granite, aplite, and pegmatite |  | | 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. __ ............. _.. _. _....Boulder County.............. . . . . . . . . . . . ......... . ....... . 103 Ores in Gilpin County ............................... . 103 Orcs in Clear Creek County ............................ . 103 Ores from |  | | Report (volume) | | OF BOULDER COUNTY, COLORADO BY T. S. LOVERING Prepared in cooperation with the COLORADO METAL MINING...MINING FUND and the COLORADO GEOLOGICAL SURVEY BOARD Strategic Minerals Investigations, 1940 (Pages 135-156)...Page Plate 24. Map showing location of Boulder County tungsten belt and general regional geology................In pocket 25. Geologic map of Boulder County tungsten belt and adjacent area..................25. Ferberite concentrates produced in Boulder County 1900-1938................. 136 26. Diagram representing |  | | 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) | | 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 Form...ILLUSTRATIONS Page PLATE 1. Geologic map of the Eldorado Springs quadrangle..___.__In pocket FIGURE 1. Index map |  | | Report (issue) | | Beryllium Area, Park and Jefferson t:-1 Counties, Colorado g ~ s:p ~ I> li:tl ~ GEOLOGICAL SURVEY PROFESSIONAL...Flats) Beryllium Area, Park and Jefferson Counties, Colorado By C. C. HAWLEY GEOLOGY AND ORE DEPOSITS OF THE...SOUTHERN TARRYALL REGION PARK AND JEFFERSON COUNTIES, COLORADO GEOLOGICAL SURVEY PROFESSIONAL PAPER 608-A A...rocks~ ____ ~ _______________________ _ Idaho Springs Formation ___________________ _ Amphibolite and hornblendite...hornblendite _______________ _ Boulder Creek{?) Granodiorite ______________ _ Silver Plume(?) Granite |  | | Report (issue) | | Geology and Ore Deposits of the Boulder County Tungsten District Colorado GEOLOGICAL SURVEY PROFESSIONAL ... Geology and Ore Deposits of the Boulder County Tungsten District Colorado By T. S. LOVERING and OGDEN TWETO...with the State of Colorado through the Colorado Geological Survey Board and the Colorado Metal Mining Fund...Pre-Cambrian rocks_____________________________ Idaho Springs formation_ _______________ Distribution ___...Age_ __________________________________ Boulder Creek granite and related rocks. ____ Distribution and |  | | Report (issue) | | Geology and Ore Deposits of the Front Range Colorado By T. S. LO\'ERING and E. N. GODDARD GEOLOGICAL...in cooperation with the Colorado State Geological Survey Board and the Colorado Metal Mining Fund ~ oopr...Metamorphic rocks ________________________ _ Idaho Springs formation _______________ _ Swandy ke hornblende...hornblende gneiss ____________ _ Quartzite at Coal Creek ________________ _ Igneous rocks _____________________________...Quartz diorite and associated hornblendite_ Boulder Creek granite _________________ _ Pikes Peak granite |  | | 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...ocean floor 13. Botryoidal fluorite ore, Poncha Springs, Colo. 14. Tungsten ore, North Carolina Rutile...Gneiss and Related Rocks, East-Central Front Range, Colorado By SHERMAN P. MARSH and DOU1GLAS M. SHERIDAN GEOLOGY...and geochemical study of rutile-bearing rocks in Colorado and a description of their occurrence elsewhere |  | | Journal (article/letter/editorial) | | ORES OF GILPIN E•soN COUNTY, COLORADO. S. BASTIN. INTRODUCTION. An exhaustive report on the economic...geology of Gilpin County and adjacentportionsof Clear Creek and Bouldercounties, Colorado,'byEdsonS. Bastinand...principalminingcentersare the following: Gilpin County ................................... ['Central...GILPIN COUNTY, COLORADO. 263 [Idaho Springs. /Gilson. -[Alice. [Dumont. Clear Creek County .........medium{I.Idaho Springs Mostly quartzt Moderately dynamo-meta- morphosed. cies. formation. Sedimentary |  | 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 (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 (issue) | | Front Range Mineral Belt Gilpin and Clear Creek Counties. Colorado GEOLOGICAL SURVEY PROFESSIONAL Prepared...Front Range Mineral Belt Gilpin and Clear Creek Counties, Colorado By E. W. TOOKER GEOLOGICAL SURVEY...Front Kange mineral belt, Gilpin and Clear Creek Counties, Colorado. Washington, U.S. Govt. Print. Off...belt, Gilpin and Clear Creek Counties, Colorado. 1963. (Card 2) 1. Geology Colorado Front Range. 2. Petrology...Petrology Colorado Front Range. 3. Ore deposits Colorado. 4. Mineralogy Colorado Front Range. 5. Metamorphism |  | | 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 (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 |  | Stark, J. T., Johnson, J. H., Behre, C. H. Jr., Powers, W. E., Howland, A. L., Gould, Don B. (1949, January) Geology and Origin of South Park, Colorado. GSA Memoir 33. Geological Society of America doi:10.1130/mem33 | Report (issue) | | Memoir 33 GEOLOGY AND ORIGIN OF SOUTH PARK, COLORADO BY J. T . STARK, J. H. JOHNSON, C. H. BEHRE,..... ................................ . Idaho Springs formation ......................... . ......................... . ...................... Maroon formation . . . .. ... ..... . . . .................. .......................... ............ Morrison formation .......... . .................. .. .............Dakota formation ... ............... .............. . ............... . .......... Benton formation ... |  | | Report (volume) | | estimates for uranium-vanadium deposits on the Colorado Plateau, by A. L. Bush and H. K. Stager__ __ ___...the Goodrich quartzite, Palmer area, Marquette County, Michigan, by R. C. Vickers. --(G) Wall-rock control...deposits in Golden Gate Canyon, Jefferson County, Colorado, by John W. Adams and Frederick Stugard, ...uranium deposits in the Red Desert, SweBtwater County, Wyoming, by Donald G. Wyant, William N. Sharp...Sheridan_________. (J) Stratigraphy of the Morrison formation in part of northwestern New Mexico, by V. L. Freeman |  | | Journal (article/letter/editorial) | | anotlrer by the northeust-southwest-treiiiliii~ Mullen Creek-Nash Fork Shc;ir Zoiic. The older northernmost province...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 |  | | Report (volume) | | Monazite Concentrations Central City District Colorado GEOLOGICAL SURVEY BULLETIN Prepared in part...City District Colorado By E. J. YOUNG and P. K. SIMS GEOLOGY AND ORE DEPOSITS, CLEAR CREEK, GILPIN, AND...AND LARIMER COUNTIES, COLORADO GEOLOGICAL SURVEY BULLETIN 1032-F Prepared in part on behalf of the...Generalized geologic map of the Central City district, Colorado.___________________________________________ 67... GEOLOGY AND ORE DEPOSITS, CLEAR CREEK, GILPIN, AND LARIMER COUNTIES, COLORADO PETROGRAPHY AND ORIGIN OF |
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