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ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION Colorado School of Mines General History Beebe, Lucius Narrow gauge in the Rockies [Stacks, HE3695 .C6 B4] LeMassena, R. A Union Pacific in Colorado, 1867-1967 [Archives, TF25 .U5 L45] LeMassena, R. A Colorado’s mountain railroads [Archives, TF688 .C6 L4] Ferrell, Mallory C & S ng : Colorado & Southern narrow gauge [Archives, HE3695 .C6 F47] Lathrop, Gilbert Rio Grande glory days [Archives, HE2754.L33 A37 1976] Ormes, Robert Tracking ghost railroads in Colorado [Stacks, HE2771.C6 O77 1975] Ormes, Robert Railroads and the Rockies [Archives, HE2771 .C6 O7] Sanders, Dale Rio Grande : scenic line of the world [Archives, TF25.D43 S35 1994] Thayer, William Rocky Mountain railroads of Colorado [Archives, HE2771.C6 T3 1977] Wilkins, Tivis Colorado railroads : chronological development [Stacks, TF24 .C6 W54] Clear Creek County Colorado and Southern Railway. Office of Valuation Engineer Right of way & track map, the Colorado & Southern Railway Co., operated by Colorado & Southern Railway Co., Clear Creek District [Map; G4314.G6P3 1918 .C68]. Hauck, Cornelius Narrow gauge to Central and Silver Plume [Stacks, HE1001 .C63] Eric Twitty 1 Mountain States Historical 303)499-4334 ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION Hollenback, Frank The Argentine Central [Archives; TF25.A68 H6 1959]. Morgan, Gary Rails around the Loop : the story of the Georgetown Loop [Archives; TF24.C6 M67 1976]. Nature’s romance : "Over the Loop", Clear Creek Canon and adjacent scenery [Archives; F776 .H8 1896]. The far-famed Georgetown Loop : the grandest of all one day trips STX 2 07/14/97 C917.8861 F22 1913 (Denver Public Library) Summit County Chappell, Gordon The South Park line : a concise history [Archives, HE1001 .C63] Osterwald, Doris High line to Leadville : a mile by mile guide [Archives, TF25.L37 O88 1991] Poor, Meredith Denver, South Park & Pacific; a history of the Denver, South Park & Pacific Railroad and allied narrow gauge lines of the Colorado & Southern Railway Company [Archives, HE3695 .C6 P6] Poor, M. C. Denver, South Park & Pacific; pictorial supplement [Archives, HE3695.C6 P6 1959 ] Maps Map of the Denver & Rio Grande railroad sys [Archives, G4311.P3 1895 .H6] Right of way & track map, the Colorado & Southern Railway Co., operated by Colorado & Southern Railway Co., Clear Creek District [maps, G4314.G6P3 1918 .C68] Eric Twitty 2 Mountain States Historical 303)499-4334 ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION CU Norlin General Cafky, Morris Colorado Midland ARCHIVES UA HE2791 .C7985 c.3 Chappell, Gordon Scenic line of the world [Stacks, HE2771.C6 C43] Jessen, Kenneth Railroads of northern Colorado BUSINESS STACKS HE2771.C6 J47 1982 Ferrell, Mallory C & S ng : Colorado & Southern narrow gauge [Stacks, HE3695.C6 F47] Lathrop, Gilbert Rio Grande glory days PASCAL OFFSITE HE2754.L33 A37 c.2 LeMassena, R. A Colorado's mountain railroads [Archives? Stacks? TF688.C6 L4] Logan, Roger The economic reasons for the abandonment of railroads and portions of railroads in Colorado ARCHIVES UA 378.788B L8285e Ormes, Robert Railroads and the Rockies [Archives? Stacks? HE2771.C6 O7] Ormes, Robert Tracking ghost railroads in Colorado [Stacks, HE2771.C6 O8 1980] Wilkins, Tivis Colorado railroads : chronological development [Archives?, TF24.C6 W5] Clear Creek County Griswold, P. R. Georgetown and the Loop Archives TF25.G45 G75 1988 Eric Twitty 3 Mountain States Historical 303)499-4334 ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION Summit County Kindig, R. H Pictorial supplement to Denver South Park & Pacific BUSINESS STACKS HE3695.C6 K5 c.2 Osterwald, Doris High line to Leadville : a mile by mile guide ENGINE STACKS TF25.L37 O88 1991 Eric Twitty 4 Mountain States Historical 303)499-4334 ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION Denver Public Library General A history of the Colorado and Southern Railway Company STX 2 05/04/98 C385.065788 H629 Colorado rail annual no. 24 : a ticket to ride the narrow gauge, a chronological history of Denver & Rio Grande 5THLEV 11/26/03 C385 C718 no. 24 2000 Colorado rail annual no. 19 : coal, cinders, and parlor cars 5THLEV 10/31/03 C385 C718 no. 19, 1991 Everett, George The cavalcade of railroads in central Colorado 2NDLEV 05/05/07 385.0973 E93ca Ferrell, Mallory C & S ng : Colorado & Southern narrow gauge 5THLEV 04/13/89 C385.520978 F413c Jessen, Kenneth Railroads of northern Colorado 2NDLEV 11/20/07 385.097886J496rai Klinger, Tom C&S High Line memories 2NDLEV 12/10/07 385.09788 Klinger LeMassena, R. A. Union Pacific in Colorado, 1867-1967 2NDLEV 06/24/04 385.0973 L541un LeMassena, R. A. Colorado's mountain railroads 2NDLEV 02/16/08 385.09788 L541co 1984 Myrick, David Colorado rail annual no. 27 : Western Pacific, the last transcontinental railroad 5THLEV 10/23/06 C385 C718 no. 27 2006 Ormes, Robert Tracking ghost railroads in Colorado 2NDLEV 10/26/07 385.09788 073tr Sabin, Edwin "Around the circle" : a thousand miles through the Rockies STX 2 12/08/98 C917.880431 S116ar 1915 Eric Twitty 5 Mountain States Historical 303)499-4334 ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION Thayer, William Rocky Mountain railroads of Colorado : a marvel of the new West STX 2 04/01/99 C385.09788 T339ro 1 Wiatrowski, Claude Railroads of Colorado : your guide to Colorado's historic 2NDLEV 01/18/08 385.09788 Wiatrows Clear Creek County Abbott, Dan Colorado Central Rail Road : Golden, Central City, Georgetown [Stacks 2 floor; 385.09788]. Brunk, Harry W Up Clear Creek on the narrow gauge [Stacks 2 floor; 625.19 B836up 1990]. Hauck, Cornelius Colorado rail annual no. 10 : narrow gauge to Central and Silver Plume 5THLEV 10/31/03 C385 C718 no. 10 1972 Hollenback, Frank The Argentine Central, a Colorado narrow-gauge STX 2 10/31/94 C385.09 A691ho A day in the cañons of the Rockies and more particularly Clear Creek Cañon STX 2 09/08/03 C917.88 U5812day 1897 About the line of the Gilpin & Clear Creek district railway STX 2 11/10/87 C385.09 G427ab Argentine Central Railroad STX 2 09/29/04 C811 A69ar Gray's Peak route STX 2 03/28/97 C917.8861 A691gr 1910 Idaho Springs--Colorado, Clear Creek County 4THLEV 07/14/97 G4314 .I2 1953 C6H5 MAP AREA REFERENCE The Loop and Clear Creek Canon STX 2 11/06/00 C917.8861 L873 The Loop [map] : 51 miles west from Denver MAP 01/03/96 CG4313 .C4.P3 1883 .C6 Eric Twitty 6 Mountain States Historical 303)499-4334 ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION Map of the Gilpin and Clear Creek District Railway MAP 09/01/00 CG4312 .P3 1905? .H3 REFERENCE Nature's romance : "over the loop," Clear Creek Canon STX V 12/05/96 C917.8861 N219 The object of building the Gilpin and Clear Creek District Railway STX 2O 06/28/99 C385.065 H146ob 1907 The serpentine trail of the Colorado & Southern through Clear Creek Canon STX 2 06/12/97 C917.8861 S486 Summit County Colorado rail annual no. 12 : the South Park Line, a concise history 5THLEV 10/31/03 C385 C718 no. 12 1974 Osterwald, Doris High line to Leadville : a mile by mile guide 3RDLEV 12/10/07 917.884 O85hi Poor, M. C Denver, South Park & Pacific; a history of the Denver, South Park & Pacific Railroad and allied narrow gauge lines STX 2 05/26/92 C385.09 D437po Eagle County Cafky, Morris Colorado Midland 2NDLEV 10/23/07 385.0973 C117co Colorado rail annual no. 17 : a journal of railroad history 5THLEV 10/31/03 C385 C718 no. 17 1987 Griswold, P. R Denver and Salt Lake Railroad, 1913 to 1926 2NDLEV 07/31/07 385.09788 G889de LeMassena, R. A. Rio Grande ... to the Pacific 5THLEV 12/29/87 C385.09 D433Lem Eric Twitty 7 Mountain States Historical 303)499-4334 ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION Boulder Carnegie General Cafky, Morris Colorado Midland BCARN Rare Books 385.09788 Chappell, Gordon Scenic line of the world BCARN Reference 385.0978 Crum, Josie The Rio Grande Southern Railroad BCARN Reference 385.52097882 Everett, George The cavalcade of railroads in central Colorado BCARN Reference 385.09788 REFERENCE Ferrell, Mallory C & S n g, Colorado and Southern narrow gauge BCARN Reference 385.5209788 Jessen, Kenneth Railroads of northern Colorado BCARN Reference 385.09788 REFERENCE Lathrop, Gilbert Rio Grande glory days BMAIN Adult NonFiction 385.09788 BCARN Reference 385.09788 REFERENCE LeMassena, R. A Colorado's mountain railroads BCARN Reference 385.09788 Wilson, O. Meredith The Denver and Rio Grande project, 1870-1901 BCARN Reference 385.09 Ormes, Robert Railroads and the Rockies BCARN Reference 385.09788 REFERENCE Ormes, Robert Tracking ghost railroads in Colorado BCARN Reference 385.09788 REFERENCE BMAIN Reference 385.09788 REFERENCE Thayer, William Rocky Mountain railroads of Colorado BCARN Reference 385.09788 REFERENCE Eric Twitty 8 Mountain States Historical 303)499-4334 ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION Wiatrowski, Claude Railroads of Colorado : your guide BMAIN Adult NonFiction 385.09788 W Wilkins, Tivis Colorado railroads: chronological development BGRB Adult Nonfiction 385.09788 Clear Creek County Abbott, Dan Stairway to the stars: Colorado's Argentine Central BCARN Reference 385.5209788 REFERENCE Griswold, P. R. Georgetown and the loop BMAIN Adult NonFiction 385.520978861 Hollenback, Frank The Argentine Central BCARN Reference 385.5209788 REFERENCE Cornelius W. Hauck Colorado rail annual No. 10, Narrow gauge to Central and Silver Plume BCARN Reference 385.09788 v.10 1972 Morgan, Gary Rails around the Loop BCARN Reference 385.520978861 REFERENCE Wiatrowski, Claude The Georgetown Loop Railroad BCARN Reference 385.520978861 REFERENCE Summit County Digerness, David The mineral belt: an illustrated history featuring the Denver, South Park & Pacific BCARN Reference 385.5209788 REFERENCE Poor, M. C Denver South Park and Pacific: memorial edition BMAIN Adult NonFiction 385.5209788 BCARN Rare Books 385.5209788 REFERENCE Eric Twitty 9 Mountain States Historical 303)499-4334 ARCHIVAL RESEARCH: RAILROAD TRANSPORTATION Eagle County Danielson, Clarence Basalt: Colorado midland town BCARN Reference 978.844 Griswold, P.
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  • Isotopic Age Determinations, Unaltered and Hydrothermally Altered Igneous Rocks, North-Central Colorado Mineral Belt A.A

    Isotopic Age Determinations, Unaltered and Hydrothermally Altered Igneous Rocks, North-Central Colorado Mineral Belt A.A

    Isotopic age determinations, unaltered and hydrothermally altered igneous rocks, north-central Colorado mineral belt A.A. Bookstrom, C.W. Naeser, and J.R. Shannon Isochron/West, Bulletin of Isotopic Geochronology, v. 49, pp. 13-20 Downloaded from: https://geoinfo.nmt.edu/publications/periodicals/isochronwest/home.cfml?Issue=49 Isochron/West was published at irregular intervals from 1971 to 1996. The journal was patterned after the journal Radiocarbon and covered isotopic age-dating (except carbon-14) on rocks and minerals from the Western Hemisphere. Initially, the geographic scope of papers was restricted to the western half of the United States, but was later expanded. The journal was sponsored and staffed by the New Mexico Bureau of Mines (now Geology) & Mineral Resources and the Nevada Bureau of Mines & Geology. All back-issue papers are available for free: https://geoinfo.nmt.edu/publications/periodicals/isochronwest This page is intentionally left blank to maintain order of facing pages. 13 ISOTOPIC AGE DETERMINATIONS, UNALTERED AND HYDROTHERMALLY ALTERED IGNEOUS ROCKS, NORTH-CENTRAL COLORADO MINERAL BELT ARTHUR A. BOOKSTROM 1805 Glen Ayr Dr., Lakewood, CO 80215 CHARLES W. NAESER U.S. Geological Survey, Denver, CO 80225 JAMES R. SHANNON Department of Geology, Colorado School of Mines, Golden, CO 80401 Monzonite and granodiorite intrusions of the Empire Fission-track age determinations were done in the fission- district are early Tertiary (65 Ma) in age, as dated by track laboratory of the U.S. Geological Survey in Denver, Simmons and Hedge (1978). Monzonite and granodiorite and at the University of Utah Research Institute. People intrusions of the Alma district have yielded isotopic ages who cooperated in this study include Mark Coolbaugh, ranging from 71 to 41 Ma (Bookstrom, in press).