 | | Journal (article/letter/editorial) | | 1, 1944 STRUCTURE AND PETROLOGY OF SPECIMEN MOUNTAIN, COLORADO BY ERNEST E . WAHLSTROM CONTENTS Page...ILLUSTRATIONS Figure Page 1. Outline map of north-central Colorado................................................................... 78 2. Geologic map of Specimen Mountain area............................................... 81 3. Geologic cross sections of Specimen Mountain.............................................Iceberg Lake to Specimen Mountain................ 84 6. Larsen plots of Specimen Mountain rocks........ |  | | 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 |  | | Journal (article/letter/editorial) | | COLORADO TOPAZ Topaz, Al Si0 (F,OH) is one of Colorado's better known gem minerals. Though Col orado...(PJM), 975 (TCM) Box 25046, Federal Center Denver, Colorado 80225-0046 A ccording to Cross and Hillebrand...discovery of Colorado topaz was made about 1880 by a Mr. Thiebald,* "a prospector of Colorado Springs."...area. The largest fine-quality topaz specimens in Colorado occur in several separate and distinct localities...are also referred to the general discussions of Colorado topaz in Eckel (1961) and Pearl (1963) and to |  | Burt, Donald M., Sheridan, Michael F., Bikun, James V., Christiansen, Eric H. (1982) Topaz rhyolites; distribution, origin, and significance for exploration. Economic Geology, 77 (8) 1818-1836 doi:10.2113/gsecongeo.77.8.1818 | Journal (article/letter/editorial) | | soccuron both sidesof the ColoradoPlateau (in Colorado,New Mexico, Arizona, Utah, and Nevada) and in...Introduction occurrencein a lava flow near Nathrop, Colorado, IN 1884 Whitman Crossdescribedtopaz, A12SiO4F2...porphyriticrhyolitedomeat Chalk Mountain, and garnet in samplesof lithophysalrhyolite lava Colorado,lessthan4 km westof...Crossreviewedthisand a similar 1959, the Spor Mountain beryllium depositswere discoveredin this same...Fluorine-rich extrusions(domesor flows)typically crustsof sanidine,tabular to prismatic,pink to red hexagonsof beryl |  | | Journal (article/letter/editorial) | | DEPOSITS IN THE SPECIMEN MOUNTAIN VOLCANICS, ROCKY MOUNTAIN NATIONAL PARK, COLORADO EnNBsrE. Wanrsrnou...Colorad.o. Assrnecr Specimen Mountain, in Rocky Mountain National Park, Colorado, is a denuded Tertiary...551 552 .)JJ 55s 55s 556 559 561 LocerroN Specimen Mountain (elevation 72,482feet) is a prominent landmark...continental divide at the crest of the Front Range of Colorado (Fig. 1). It lies just north of Poudre Lake at...Milner Passin the northwestern corner of Rocky Mountain National Park. Streams on the south side drain |  | | Report (issue) | | INTRUSIVE ROCKS OF COLORADO By Edward J. Young Prepared in cooperation with The Colorado Mining Industrial...Industrial Development Board and the Colorado Geological Survey This report is preliminary and has not been...intrusive rocks of Colorado » » » *«» In pocket Laramide-Tertiary intrusive rocks of Colorado By Edward...Laramide-Tertiary intrusive rocks in the State of Colorado, geologic age localities, mining districts, localities...This information is shown on the State map of Colorado (scale 1:500,000) accompanying this report. In |  | 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) | | the Hot Sulphur Springs Quadrangle, Grand County, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 586...the Hot Sulphur Springs Quadrangle, Grand County, Colorado By GLEN A. IZEIT GEOLOGICAL SURVEY PROFESSIONAL...19 Grouse Mountain Basalt and related dikes _____ _ Boulder conglomerate of Gravel Mountain ___ _ Conglomerate...map of the Hot Sulphur Springs quadrangle, Grand County, Colo __________________________ In pocket FIGURE...rocks in Middle Park, Colo., and selected areas in Colorado, Nebraska, and Wyoming__________________________________________ |  | | Journal (article/letter/editorial) | | Arizona 85287, USA 1 Department of Geology, University of Iowa, Iowa City, Iowa 52242, USA z Applied Geologic...Geologic Studies, Englewood, Colorado 80110, USA ,Abstract. High-silica topaz-bearing rhyolites of Cenozoic...Cenozoic age are widely distributed across the western USA and Mexico. They are characteristically enriched...devitrifled groundmasses. Magmatic phases include sanidine, quartz, oligoclase and Fe-rich biotite. Allanite...Grande rift (New Mexico and Colorado) and thus appear to surround the Colorado Plateau. Similar middle to |  | | Book (edition) | | MILEAGE L OGS. REVISED EDITION Revised Edition, COLORADO GEM TRAILS AND MINERAL GUIDE HICllAHD :--1. PEARL...an extensive ¥em and mineral collecting tour 01 Colorado, revealing the interesting places where Nature...Swallow, Publisher) 2679 South York Street Denver, Colorado 80210 - , =· - ·, BOOKS BY RICHARD M. PEARL...Exploring Rocks, Minerals, Fossils in Colorado America's Mountain: Pikes Peak and the Pikes Peak Region...Atlas of Colorado American Gem Trails Nature As Sculptor: A Geologic Interpretation of Colorado . Scenery |  | | Book (edition) | | — _ ; COLORADO GEM TRAILS AND MINERAL GUIDE ! ■ : ' BOOKS BY RICHARD M. PEARL Colorado Gem Trails...Trails and Mineral Guide Colorado Rocks, Minerals, Fossils America’s Mountain: Pikes Peak and the Pikes...Nature As Sculptor: A Geologic Interpretation of Colorado Scenery Guide to Geologic Literature Popular Gemology...Gemology Mineral Collectors Handbook Colorado Gem Trails The Art of Gem Cutting (With Dr. H. C. Dake)...Dake) * RICHARD M. PEARL ★ COLORADO GEM TRAILS AND MINERAL GUIDE ★ SKETCH MAPS BY MIGNON WARDELL PEARL |  | | Report (issue) | | younger h1gh-s1Uca rhyoMtes and granites from Colorado and north-central New Mexico by 1X Celia H....younger high-silica rhyolites and granites from Colorado and north-central New Wexico Celia H. Steigerwald*...younger high-silica rhyolites and granites from Colorado and north-central Ney Mexico* The data were compiled...the many granite molybdenite system prospects in Colorado* We then decided to broaden the data bank to include...younger high-silica rhyolites and granites in Colorado for which chemical data were available* Our aim |  | | Report (issue) | | the Rocky Mountain Section meeting of The Geological Society of America Boulder, Colorado, 1973 Edited...SOCIETY OF AMERICA, INC. 3300 Penrose Place Boulder, Colorado 80301 24 AUG 1990 The Memoir series was originally...northwestern Colorado and its implications concerning tectonism and the origin of the Colorado River system...Cenozoic sedimentation and deformation in northern Colorado and AGIOS ATCAGws jaceeet ty pes wien ano os Kar...helt 249 Neogene tectonism in south-central Colorado... a 2) 7 min 4 am ie a - =a, geek @a |  | | Report (issue) | | TROUBLESOME FORMATION IN MIDDLE 9ikRK, NORTHWESTERN COLORADO PART I: STRATIGRAPHY PART II: PETROGRAPHY AND...C. 20242, Building 25, Federal Center, Denver, Colorado 80225, and 345 Middlefield Road, Menlo Park, California...Troublesome Formation in Middle Park, northwestern Colorado, by G. A. Izett, 42 pages, 7 figures, and 4 tables...Miocene Troublesome Formation near Kremmling, Grand County, Colo- 2 2. Sketch map showing distribution of...sedimentary rocks and major rivers of northwestern Colorado and south-central Wyoming 3 3. Schematic section |  | | Book | | comfort and time to hold in their hands a single specimen of a gemstone never before seen by human eyes...is enhanced. They could probably buy a similar specimen in a rock shop or jewelry store for a fraction...desires. Sometimes the talus slopes at the base of a mountain contain rich indications of a dike or sill above...famous was the single beryl stone found in Oxford County in Maine that weighed 18 tons and was 18 feet in...well as to visualize the original state of the specimen. This chapter has given only the most simple introduction |  | | Book (volume) | | Kobuk jade locality. Descriptions of San Diego County, California, gemstones and the mines in which they...the generous assistance of many residents of that county. My special thanks are extended to Elbert H. McMacken...Turner Emerald Mine . Mt. Antero aquamarine matrix specimen . Mesa Grande morganite crystal . Four topaz crystals...Mt. Mica Eh Towne Quarry 180 Tourmaline Queen Mountain IgI Tourmaline crystal (color) following 112 Tourmaline...crystals Almandine from Wrangell Spessartite matrix specimen Spessartite mass Ramona mines Rock crystal and |  | | Report (issue) | | the major product (as at Climax and Henderson, Colorado, and Questa, New Mexico), or is a co- or byproduct...XVT XVA XWA XWI XWY ALASKA ARIZONA CALIFORNIA COLORADO GEORGIA IDAHO MAINE MISSOURI MONTANA NEVADA NEW...cross sections of the Pine Grove-B la*n Mountain area. Beaver County, Utah: U. S. Geological Survey Open-File...molybdenum system, southern wah wah Mountains, Beaver County, Utah (abstract): American Institute of Mining...deposits of the Mount Antero region, Chaffee County, Colorado: U.S. Geological Survey Bulletin 982-D, p |  | | Book (edition) | | from the Tourmaline Q ueen .1ine, Pala, San Diego County, California. From a pen-and-ink drawing by W. E...opal, Spencer, Idaho 25. Drawing of hyalite opal specimen, Mexico 26. Hyalite opal photomicrograph 2 7....Miners at Crystal Peak, Colorado 30. Pegmatite pocket, Crystal Peak, Colorado 31. Spodumene, Pala Chief...of tourmaline crystal forms 38. Map of San Diego County, California gem sources 3 9. Stewart Lithia· and...basalt, San Carlos, Arizona 48. King turquois mine, Colorado 49. Amatrice mine, Utah 5 0. \'!"ariscite rough |  | | Report (issue) | | - Tectonic movement in the Grapevine area, Kern County, Calif., by B. E. Lofgren - _ _ _ - - - _ _ _ -...extrusive volcanic rocks in Middle Park, Grand County, Colo., by G. A. Izett - - - - - _ _ - - - - _...Graford Formation of Late Pennsylvanian age, Brown County, Texas, by D. A. Myers . . . . . . . . . . . ....rocks of the Houlton-Smyrna Mills area, Aroostook County, Maine, by Louis Pavlides and W. B. N. B e r r...uranium-vanadium roll and tabular ore bodies on the Colorado Plateau, by D. R. Analytical techniques and instrumentation |  | | Book (volume) | | 56 ct), Sweet Home Mine, Colorado; colorless scheelite (19.66 ct), Kern County, California; octagonal...Vivid blue matched benitoite gems from San Benito County, California, consisting of 52 benitoites and 75...Dosen ONN/ QBI96-40247 Trade Distribution by Mountain Press Publishing Company P.O. Box 2399, Missoula...Cantlin, Ellis, [D; Jeannette B. Carillo, Gem Center USA, EI Paso, TX; Gary Christopher, The Prospectors Cache... Hughes, Boulder, CO; Duane L. Johnson, Rocky Mountain Soapstone, Butte, MT; Chris I. Johnston, Royal |  | | 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..._____________________ _ Copper deposits in Jefferson County __ _ F. M.D. property _____________ _ Malachite...________________________ _ Cherry Creek and Douglas County placers _________________________ _ Mining districts..._______ _ Dives-Dunkirk lode ________________ _ Colorado Central vein ______________ _ Griffith lode _ |  | | Book | | indebted. Appreciation is also expressed to Dr J. Arem, USA; Sr Carlos Barbosa, Brazil; Professor J. Cassedanne...Canada; Mr T. Michalski, USA; Mr J. Murphy, USA; Dr F. Pough, USA; Mrs K. Robertson, USA; Dr W. Sersen, Thailand;...Thailand; Mr M. Sonsthagen, USA; A. Theisen, USA; John White, USA; and many others in the trade who assisted...throughout the world. Brown - topaz rhyolites in western USA, and Mexico. Many pegmatites throughout the world...weight of 300 kg, is from the Brown Derby mine, Colorado, USA (Rosenberg,1972; Staatz and Trites, 1955). This |  | | Report (volume) | | 74, Ph miles east of Dutchtown, Cape Girardeau County, Mo. Type section cut by northtrending fault with...stream in NEIA sec. 33, T. 16 N., R. 14 E, Wayne County. Named after village of Abington, about 3 miles...lower divisions of the Pocono at Jim Thorpe, Bear Mountain Member and Silkmill Run Member, respectively....Named for Adam Peak in Osgood Mountains, Humboldt County. Occupies belt about 21f2 miles long on western...Portlandian) age. Mapped around Adobe Flat in Stanislaus County. Well exposed west of Wilcox Ridge in sec. 23, | | | Book (volume) | | rhoColorado; eolorless scheelite (19.66 cc), Kern Cowny, California;...Vivid blue matched benitoite gems from Sai, Benito County, California, consisting of 52 benitoites and 75...Cantlin, Ellis, ID; Jeannette B. Carillo, Gen1 Center USA, El Paso, TX; Gary Christopher, The Prospectors Cache...W Hughes, Boulder, CO; Duane L. Johnson, Rocky Mountain Soapstone, Butte, MT; Chris I. Johnston, Royal...James D. Lindberg, Las Cruces, NM; Jack Lowell, Colorado Ge1n & Mineral Co., Tempe, AZ; Steven & Lorna |  | | Report (volume) | | Cleveland, Ohio. Colorado School of Mines Magazine. See Mines Magazine. Colorado Scientific Society... 5 Colorado School of Mines Quarterly vols. 35, 36 and Supplements A, B. Golden, Colo. Colorado University...Mineralogist vols. 8, 9. Portland, Oreg. Mines Magazine, Colorado School of Mines, vols. 30, 31 Denver, Colo. Mining..., and Lee, Wallace). Oil and gas in Montgomery County, Kans.: Kansas Univ. Bull. 31, pp. 5-29, 2 pis...Chattanooga shale in Chetopa oil pool, Labette County Kans.: Am. Assoc. Petroleum Geologists Bull., vol |
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