 | | Report (issue) | | Quadrangle, Chaffee County, Colorado GEOLOGICAL SURVEY Work done in cooperation with the Colorado State Mining...the Poncha Springs SE Quadrangle, Chaffee County, Colorado By RALPH E. VAN ALSTINE GEOLOGICAL SURVEY...PROFESSIONAL PAPER 829 Work done in cooperation with the Colorado State Mining Industrial Development Board Description...Springs SE quadrangle, Colorado Page .In pocket Index map of south-central Colorado ______ __ ____ Photographs...quadrangle, Chaffee County Gravel pits in the Poncha Springs SE quadrangle, Chaffee County in GEOLOGY AND |  | | 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) | | the Poncha Springs NE Quadrangle, Chaffee County,Colorado By RALPH E. VAN ALSTINE With a section on ... PAPER 626 Prepared in cooperation with the Colorado State Mining Industrial Development Board UNITED...Ralph E. Van Alstine and Doak C. Cox _________ _ Colorado-American mine ______________ -_Delay adit and...Poncha Springs NE quadrangle. Geologic map of the Colorado-American fluorspar mine, Browns Canyon district...district. Geologic map of underground workings, Colorado-American fluorspar mine. Longitudinal section showing |  | | Journal (article/letter/editorial) | | by BRUCE R. DOE U.S. Geological Survey, Denver, Colorado INTRODUCTION T H E isotopic composition of lead...shallow. A large triangular region comprising the Colorado Plateau and the Basin and Range province has not...0-37 Pb I0> /Pb !0< 17-940 17-770 18090 18-742 Colorado 19156 19-508 19124 18-980 18-908 18-895 18-920...of the Rocky Mountain provinces in New Mexico, Colorado, Wyoming, Idaho, west Texas, Montana, and the...Lake, Calif. Little Glass Mtn., Calif. Creede, Colorado Los Posos, Jemez Mtns., New Mexico John Day, Oregon |  | | Book | | MINES AND MINERALS OF THE GREAT AMERICAN RIFT (COLORADO-NEW MEXICO) Sine —_—< ¢ te om At _SHT 40...MINES AND MINERALS OF THE GREAT AMERICAN RIFT (COLORADO-NEW MEXICO) Richard Walker Holmes and Marrianna...Mines and minerals of the Great American Rift (Colorado-New Mexico). Bibliography: p. Includes index...index. 1. Mines and mineral resources—Colorado. 2. Mines and mineral resources—New Mexico. I. Kennedy, Marrianna...minerals of the Great American Rift in New Mexico and Colorado. Great American Rift is the name we use for a |  | | Report (issue) | | ~iguel County, Colo., by F. W. Cater_ 129. A Pleistocene section at Leonards Cut, Burke County, N.C.,...volcanic sequence related to the Creede caldera, Colorado, by J. C. Ratte and T. A. Steven ___ ~-------...geochemical prospecting data from the Rocky Range, Beaver County, Utah, by J. J. Connor and A. T. ~iesch_______...part of the Smyrna ~ills quadrangle, Aroostook County, ~aine, by Louis Pavlides and F. C. CanneY----.... Thorium and uranium in monazite from Spokane County, Wash., by J. W. Hosterman, W. C. Overstreet, and |
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