 | | 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. I...________________ Amphibolite__ _ -__---__-______________. Cordierite-amphibole gneiss_______________ Calc-silicate |  | | Report (issue) | | Sequence Along Coal Creek to Idaho Springs Formation Front Range, Colorado By JOHN D. WELLS, DOUGLAS M...1. Index maps of the Coal Creek area, Eldorado Springs, Ralston Buttes, and Blackhawk quadrangles..-_________...Photomicrographs showing folded alinements in andalusite and cordierite. 12 4. Triangular diagram of Boulder Creek Granite...SEQUENCE ALONG COAL CREEK TO IDAHO SPRINGS FORMATION, FRONT RANGE, COLORADO By JOHN D. WELLS, DOUGLAS M...high-grade metamorphic gneisses of the Idaho Springs Formation elsewhere in the Front Range. Accordingly |  | | Report (volume) | | Eureka Gulch Area Central City District Gilpin County Colorado GEOLOGICAL SURVEY BULLETIN This report...Eureka Gulch Area Central City District Gilpin County Colorado By P. K. SIMS, F. W. OSTERWALD, and E....AND ORE DEPOSITS OF CLEAR CREEK, GILPIN, AND LARIMER COUNTIES, COLORADO GEOLOGICAL SURVEY BULLETIN ...silicate gneiss___________________________ _________ Cordierite-anthophyllite-garnet gneiss. _______________________...23 24 27 29 31 IV GEOLOGY AND ORE DEPOSITS, COLORADO ILLUSTKATJONS PLATE 1. Geologic maps of the Eureka |  | | Journal (article/letter/editorial) | | report that the principal rocks underlying Gilpin County, Colorado, and adjacent parts of Clear Creek and...counties are of pre-Cambrian age. The Idaho Springs formation, a quartz biotite schist of sedimentary...Geology of Gilpin County and Adjacent Parts of Clear Creek and Boulder Counties, Colorado," U.S. Geol...resembling tillite. The St. Joe-Clearwater2 region of Idaho, comprising about 250 square miles, lies about 30...The base on which they rest is not exposed. The formation of this area which is correlated with the St. |  | | Journal (article/letter/editorial) | | SOME MINERAL OCCURRENCES IN THE GUFFEY REGION, COLORADO* Jeuos E. Bnven, []niversity of Michigan, Ann...north-central Fremont County and southeast Park County in the Front Range of central Colorado. Its center is...those which have been correIated with the Idaho Springs formation and closely associatedmigmatite. Cord.ierite:Sterrett...ierite:Sterrett (1923) recognized cordierite in the Climax pegmatite, which is one of the main deposits...pp. 43-45) and Heinrich (1950) discussed the cordierite occurrencein detail, including its extensive |  | | 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...gneiss and amphibolite._________________________ Cordierite-bearing biotite gneiss_____________________________...Amphibolite in hornblende gneiss _________________ 4. Cordierite-bearing biotite gneiss and associated rocks. |  | | Report (issue) | | Metamorphism of Some High-Grade Cordierite Gneisses, Front Range, Colorado Dolores J. Gable U.S. Geological...SOCIETY OF AMERICA, INC. Colorado Building P.O. Box 1719 Boulder, Colorado 80302 Printed in the United.............. . Distribution and occurrence of cordierite .............................................................. . Stratigraphic relations of cordierite-bearing gneiss .................. .............chemical composition of cordierite-bearing gneisses ................... . Cordierite-bearing biotite gneiss |  | | Journal (article/letter/editorial) | | BEARING VEINS, CENTRAL CITY DISTRICT, GILPIN COUNTY, COLORADO • PAUL K. SIMS CONTENTS PAGE Abstract...sulfide-bearingquartz veins in the Central City district, Colorado,within the mineral belt of the Front Range. The...0 104ø tO•ø 50 Miles FIGUREI.-INDEX MAP OF COLORADO SHOWINGLOCATION OF CENTRAL CITY DISTRICT. PARAGœN...CentralCity districtis in the core of the Front Rangeof Colorado• a complexof Precambrianmetamorphicand igneousrocks...(6). Age relative to rocks below is obscure. Cordierite-cummingtonite gneissl Biotite-quar tz-plagioclase |  | | Report (volume) | | Geology of the Eldorado Springs Quadrangle Boulder and Jefferson , Counties, Colorado C_-J / By JOHN D. WELLS...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...map showing location of the Eldorado Springs quadrangle. _ D3 2. Triangular diagrams showing mineralogical |  | | 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 |  | 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). |  | | Report (issue) | | METAMORPHIC ROCKS OF THE CENTRAL FRONT RANGE. COLORADO By Dolores J. Gable ' Edited bv William. D............................................. 12 Cordierite-garnet-gedrite-biotite gneiss...................................... 12 Cordierite-biotite-quartz-plagioclase and cordierite-garnet-biotite gneiss.............................................. 14 Cordierite-sillimanite-biotite gneiss ............................................................. 14 Cordierite-magnetite-sillimanite-biotite gneiss and mag |  | | Journal (article/letter/editorial) | | of COLORADO ED RAINES Geology Museum Colorado School of Mines 1310 Maple Street Golden, Colorado 80401...Ouray County. Raines-Pettem collection, photographer unknown. B etween 1868 and 1922, Colorado produced...with another 50 million pounds mined in San Juan County (Henderson 1926). During the twentieth century...mined (Beaty, Landis, and Thompson 1990). Total Colorado production prior to 1958 reached 585 million pounds...copper; Colorado mined gold, silver, lead, and zinc. Nearly all of the copper produced in Colorado has been |  | | 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...stratigraphic relations __ Fountain formation ________________ _ Ingleside formation ________________ _ Lyons sandstone...Permian(?) and Triassic(?) ______________ _ Lykins formation __________________ _ Pennsylvanian and Permian |  | | 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 (article/letter/editorial) | | The Johns Hopkins University, Baltimore, MD 21218, USA Abstract. Monophase negative-crystal shaped CO2...1700 m.y.-old migmatites from the east-central Colorado Front Range. They are, however, quite rare in...the scale of a few centimeters suggest that the formation of these inclusions was related to the migmatization...crusts. The importance of fluid in migmatite formation, however, has long been apparent. Because partial...partial melting seems to be responsible for the formation of a majority of migmatites (for example, Johannes |  | | Journal (article/letter/editorial) | | its own structure rather than permitting their formation as separate grains (Rogers,1961). RBsur,rs On...samplesinclude: Idaho Springs Formation (2) and Mt. Morrison Gneiss (2), Front Range, Colorado; Pellisier...Roan Mountain complex, North Carolina; Valley Springs Gneiss (3), Texas; and a metasomatized(?) schist...by investigatingmetacrystsin two sectionsof the Idaho SpringsFormation. Photomicrographswere made of 10...VOL 53, JANUARY FEBRUARY, 1S68 STAINING FOR CORDIERITE AND FELDSPARSIN THIN SECTION1 SyracuseUn'i'aersity |  | | 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) | | THE CHIEF LITHIUM PEGMATITE, DEVILS HOLE, FREMONT COUNTY, COLORADO1 E. Wu. HnrNnrcu eNo Rrcnann W. VraN...) . and chemicals corporation in canon city, colorado. However, Iithium minerals were rumored to have...schistsof the Idaho Springs formation: hornblende gneiss' calc-silicate gneiss, cordierite gneiss, qttartzite...Geologic map of the Chief pegmatite' Devils Hole, Colorado' gradational contacts with wali-zone rock. In... oF THE RBcroN Lithium pegmatitesare rare in Colorado,indeed in the entire Rocky asMountain belt from |  | | Report (issue) | | GEOLOGICAL SURVEY Locatable Mineral Reports for Colorado, South Dakota, and Wyoming provided to the U.S.............................................. 1 COLORADO ................................................San Isabel and White River National Forests Lake County Land Exchange Offer (Iocmin40) .................................. 138 FIGURES OR ATTACHMENTS COLORADO Pike National Forests Shepard and Associates Land...National Forests Lake County Land Exchange Offer 1. Exhibit A: Property that Lake County will consider exchanging |  | | 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) | | Childs Mielenz, Bureau of Reclamation, Denver, Colorado Werner Nowacki, Universitiit, Bern, Switzerland...Nevada. PETROLOGY OF THE GIIFFEY-MICANITE RXGION, COLORADO university ^iiff-'"l; lll'i.l.., "t Michigan...southeast part of Park County and in the north-central part of Fremont County, Colorado, is underlain chiefly...The preCambrian rocks include: (1) The Idaho Springs formation, which consists of mica schists and gneisses...Fe-Mn phosphates, magnetite, bismutite, beyerite, cordierite-pinite, sillimanite, monazite, and uranothorite |  | | Report (issue) | | the Empire Quadrangle Grand, Gilpin, and Clear Creek Counties ColOrado. By WILLIAM A. BRADDOCK .,..,...igneous rocks in the Empire quadrangle, Grand, Gilpin, and Clear Creek Counties, Colo __ In pocket 3...CIPW norms of various Tertiary rocks from the Idaho Springs and Central City areas__ 19. Chemical compositions...THE EMPIRE QUADRANGLE, GRAND, GILPIN,, AND CLEAR CREEK COUNTIES, COLORADO " By WILLIAM ABSTRACT The...Continental Divide and includes portions of Grand, Gilpin, and Clear Creek Counties. The quadrangle is on |  | 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...___ _ ~ Pennsylvanian and Permian: Fountain Formation ___________________________ _ Permian: Lyons Sandstone..._____________ _ Permian(?) and Triassic(?): Lykins Formation ____________________ --· ___ _ Mesozoic rocks...________________ _ Ralston Creek Formation ___________ _ Morrison Formation _______________ _ Cretaceous...Benton Shale ______________________ _ Niobrara Formation ________________ _ Pierre Shale _______________________ |  | | Report (issue) | | the Front Range Mineral Belt Gilpin and Clear Creek Counties. Colorado GEOLOGICAL SURVEY PROFESSIONAL...the Front Range Mineral Belt Gilpin and Clear Creek Counties, Colorado By E. W. TOOKER GEOLOGICAL SURVEY...the Front Kange mineral belt, Gilpin and Clear Creek Counties, Colorado. Washington, U.S. Govt. Print...mineral belt, Gilpin and Clear Creek Counties, Colorado. 1963. (Card 2) 1. Geology Colorado Front Range...Range. 2. Petrology Colorado Front Range. 3. Ore deposits Colorado. 4. Mineralogy Colorado Front Range. 5 |
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