 | | Report (issue) | | Badger Flats) Beryllium Area, Park and Jefferson t:-1 Counties, Colorado g ~ s:p ~ I> li:tl ~ GEOLOGICAL...Badger Flats) Beryllium Area, Park and Jefferson Counties, Colorado By C. C. HAWLEY GEOLOGY AND ORE DEPOSITS...THE SOUTHERN TARRYALL REGION PARK AND JEFFERSON COUNTIES, COLORADO GEOLOGICAL SURVEY PROFESSIONAL PAPER...rocks~ ____ ~ _______________________ _ Idaho Springs Formation ___________________ _ Amphibolite and hornblendite...THE SOUTHERN TARRYALL REGION PARK AND jEFFERSON COUNTIES, COLORADO GEOLOGY AND BERYLLIUM DEPOSITS OF THE |  | | Report (issue) | | Sequence Along Coal Creek to Idaho Springs Formation Front Range, Colorado By JOHN D. WELLS, DOUGLAS M...rocks_______ Microcline - quartz - plagioclase - biotite gneiss (microcline gneiss)________________________..._________ Microcline - quartz - plagioclase - biotite gneiss and hornblende gneiss (microcline gneiss...schist-----_-_____-___________________ Biotite-quartz-plagioclase gneiss and mica schist (biotite gneiss and mica schist)_____________...1. Index maps of the Coal Creek area, Eldorado Springs, Ralston Buttes, and Blackhawk quadrangles..-_________ |  | | Journal (article/letter/editorial) | | REGIONAL METAMORPHISM IN THE NORTHERN FRONT RANGE, COLORADO Abstract: Rubidium-strontium dating of wholerock...A large part of the Precambrian terrane of the Colorado Front Range consists of schists and gneisses which...(Fig. 1). West of Golden, Colorado, these were named the Idaho Springs Formation by Ball (1906). The Idaho...Springs Formation consists chiefly of sillimanitic biotite gneisses and is generally considered to be of metasedimentary...resulted in a zonal pattern of mineral assemblages. Biotite, garnet, staurolite, andalusite, sillimanite-muscovite |  | | Report (volume) | | Western Part of the Morrison Quadrangle Jefferson County, Colorado GEOLOGICAL SURVEY BULLETIN 1251-E...Western Part of the Morrison Quadrangle Jefferson County, Colorado By D. J. GABLE CONTRIBUTIONS TO GENERAL...rocks along the mountain front due west of Denver, Colorado UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON...___.____ Biotite gneiss.____________________________________________ Garnetiferous biotite gneiss _ _____...amphibolite._________________________ Cordierite-bearing biotite gneiss_____________________________ Quartz-plagioclase |  | | Report (issue) | | area, Colorado Distribution of Beryllium Tin, and Tungsten in the Lake George area, Colorado By C....mineral deposits of the Lake George and Tarryall Springs areas -----------------------------------------------2...BERYLLIUM, TIN, AND TUNGSTEN IN THE LAKE GEORGE AREA, COLORADO By C. C. HAWLEY and W. R. GRIFFITTS Abstract...bodies of Precambrian age in the Lake George area, Colorado. They include greisens that contain high concentrations...INTRODUCTION The Lake George area and adjacent Tarryall Springs area, near Lake George in south-central Colorad |  | | Report (issue) | | GOLDEN GATE CANYON AND RALSTON CREEK AREAS JEFFERSON COUNTY, COLORADO This report concerns work done on behalf...GATE CANYON AND RALSTON CREEK AREAS, JEFFERSON COUNTY, COLORADO By J. W. Adams, A. J. Gude 3d, and E...GATE CANYON AND RALSTON CREEK AREAS, JEFFERSON COUNTY, COLORADO By J. W..Adams, A. J. Gude 3d, and E...2. 3. 4. 5. 6. 7. 8. 9. Index map of central Colorado ................................................at nine localities in the northern part of Jefferson County, Colo., in shear zones that cut preCambrian |  | | Report (volume) | | Geology of the Platte Canyon Quadrangle Colorado By WARREN L. PETERSON CONTRIBUTIONS GEOLOGICAL TO...rocks________--__-_-__-----___-__---_-_-_-_Biotite gneiss (biotite-quartz-plagioclase gneiss),..._.__________ Amphibolite...____-______---_-__-___--__-__-_-______ Sillimanitic biotite gneiss--____-_---___-_-_-_______-________ Migmatite...gneiss________________.___-_---_-__-_-_-_-__--_-___--_ Biotite quartz diorite--------------------------------...diorite-_____________________________________ Biotite-muscovite granite..____-__-----------------_----_-___ |  | | Report (volume) | | Uranium Deposits of the Caribou Area, Boulder County Colorado GEOLOGICAL SURVEY BULLETIN This report concerns...Uranium Deposits of the Caribou Area, Boulder County Colorado By F. B. MOORE, W. S. CAVENDER, and' E. P....Rock units_____ - - _________________ . Idaho Springs formation --______________ Boulder Creek granite____...Point mine______-________-___ ________________ _ Idaho mine___________ ___________________ Gold mine_____...Plate 35. Geologic map of the Caribou area, Boulder County, Colo. 36. Composite map of the Caribou mine, showing |  | | 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 |  | | 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...consists chiefly of muscovite schist with minor biotite schist and quartzite. This series was intruded after |  | | Journal (article/letter/editorial) | | Geological Survey, Vermillion, S. D. Paleozoic Colorado land mass extended from northern Black Hills nearly...transgression lasting to mid-Turonian (embracing Graneros formation). Basin downwarping recurred during Laramide and...across South Dakota. Wisconsin glaciation and formation of Missouri River are later than the old age valleys...State Geological Survey, Vermittion, S. D. A formation of chert and volcanic ash crops out east of Sioux...the Northern States Power Plant, indicates a formation at least 60 feet thick, composed of chert, containing |  | | Report (issue) | | REYNOLDS AREA LAWSON-DUMONT DISTRICT CLEAR CREEK COUNTY COLORADO By J. E. Harrison and B. F. Leonard UNITED...REYNOLDS AREA LAWSON-DUMONT DISTRICT, CLEAR CREEK COUNTY, COLORADO By J. E. Harrison and B. F. Leonard This...REYNOLDS AREA LAWSON-DUMONT DISTRICT, CLEAR CREEK COUNTY, COLORADO CONTENTS Page Abstract ............................................. Idaho Springs formation................... Biotite-quartz-plagioclase gneiss...Sisters groups of claims. The area is in Clear Creek County, Colo., about three-fourths of a mile south of |  | | 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...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 |  | | Report (volume) | | Geology of the Eldorado Springs Quadrangle Boulder and Jefferson , Counties, Colorado C_-J / By JOHN D. WELLS...Hornblende gneiss__-___________________ ____________ 'Biotite gneiss____-_______---------_-_____-____________...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 (volume) | | the Freeland-Lamartine District, Clear Creek County, Colorado GEOLOGICAL SURVEY BULLETIN This report...the Freeland-Lamartine District, Clear Creek County, Colorado By J. E. HARRISON and J. D. WELLS GEOLOGY...OF CLEAR CREEK, GILPIN, AND LARIMER COUNTIES, COLORADO GEOLOGICAL SURVEY BULLETIN 1032-B This report...____________________________ _ Idaho Springs formation___________________________ Biotite-quartz gneiss_______...gneiss____________________________ _ Sillimanitic biotite-quartz gneiss______________________ Amphibolite. ______ |  | | Report (volume) | | urn-bearing Area, Ralston Buttes District, Jefferson County, Colorado U.S. GEOLOGICAL SURVEY BULLETIN 1555...urn-bearing Area, Ralston Buttes District, Jefferson County, Colorado By E.]. YOUNG U.S . GEOLOGICAL SURVEY...and prospects in the Front Range near Golden, Colorado UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON...uraniumbearing area, Ralston Buttes district, Jefferson County, Colorado. (Geological Survey bulletin ; 1555)...I. Geology-Colorado-Jefferson County. 2. Uranium mines and mining-Colorado-Jefferson County. 3. Geoch |  | | 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...joints in the B series. . . . 9. Equal-area plot of biotite in the A series.. . 10. Equal-area plot of quartz...quartz in the A series... 11. Equal-area plot of biotite in the B series... Page 1220 1226 1229 1232 1236 |  | | Report (issue) | | PRELIMINARY REPORT ON THE ECONOMIC GEOLOGY OF GILPIN COUNTY, COLORADO. By EDSON S. BASTIN and JAMES M. HiLL.1 INTRODUCTION...brief account of the economic geology of Gilpin County and adjacent portions of Clear Creek and Boulder...Mountains. It is the oldest lode-mining region in Colorado, and its discovery in 1859 was the occasion of...area includes the productive portions of Gilpin County and small adjacent parts of Boulder and Clear Creek...humidity. The principal mining centers are, in Gilpin County, Central City, Blackhawk, Nevadaville, Eussell |  | | 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...________________________ Biotite gneiss ___________________________ Biotite-quartz-plagioclase gneiss |  | | 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 (volume) | | Preliminary Study of Radioactive Limonite in Colorado, Utah, and Wyoming GEOLOGICAL SURVEY BULLETIN... Preliminary Study of Radioactive Limonite in Colorado, Utah, and Wyoming By T. G. LOVERING and E. P...1921Preliminary study of radioactive limonite in Colorado,. Utah, and Wyoming, by T. G. Levering and E....1919joint author, n. Title: Kadioactive limonite in Colorado, Utah, and Wyoming. (Series: U. S. Geological...Cat area, Grand County, Utah_______________________ Snow-Bonniebell claims, Uintah County, Utah ________________ |  | | Report (issue) | | Remediation in the Area from Denver to Idaho Springs, Colorado U.S. GEOLOGICAL SURVEY CIRCULAR 1097 ...Remediation in the Area from Denver to Idaho Springs, Colorado Edited by K.C. Stewart and R.C. Severson...Thomas Kohnen Geoffrey S. Plumlee Richard B. Tripp Colorado School of Mines Ronald R. Cohen John C. Emerick...Ronald W. Klusman Thomas R. Wildeman Colorado School of Mines Colorado Department of Transportation Denver...Denver Post Denver Public Library Idaho Springs Historical Society U.S. Geological Survey Graphics by Michael |  | | Report (volume) | | important were those in the Central City district, Colorado, from which about 300 tons of high-grade pitchblende...Schwartzwalder (Ralston Creek) and Los Ochos mines, Colorado; the Early Day and Buckhorn claims, Nevada; the...deposits in the Dripping Spring quartzite, Gila County, Ariz. According to Nininger (1954, p. 43), as...except for some in the Central City district, Colorado were discovered since the mid-1940's. The study...deposits of the Mount Antero region, Chaffee County, Colorado: U. S. Geol. Survey Bull. 982-D, p. 95-119 |  | | Report (issue) | | Precambrian Crystalline Rocks, Park and Jefferson Counties, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER...Precambrian Crystalline Rocks, Park and Jefferson Counties, Colorado By C. C. HAWLEY and R. A. WOBUS GEOLOGY...THE SOUTHERN TARRYALL REGION, PARK AND JEFFERSON COUNTIES, COLORADO GEOLOGICAL SURVEY PROFESSIONAL PAPER...of the Precambrian crystalline rocks, Park and Jefferson Counties. (Geology and ore deposits of the southern...southern Tarryall region, Park and Jefferson Counties, Colorado) (Geological Survey Professional Paper |  | | Report (volume) | | in Colorado GEOLOGICAL SURVEY BULLETIN 1422-D Nomenclature of Precambrian Rocks in Colorado By...Ogden, 1912Nomenclature of Precambrian rocks in Colorado. (Contributions to stratigraphy) (Geological Survey...Pre-Cambrian. 2. Geology, Stratigraphic Nonmenclature Colorado. I. Title. II. Series. HI. Series: United States... ILLUSTRATION Page FIGURE 1. Map of parts of Colorado and adjoining States showing distribution of Precambrian...1. Classification of Precambrian rock units in Colorado............................. D4 in CONTRIBUTIONS |
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