Date File Created Name of Creator 4/1/2006 Rich Gaschnig GeoRef Data 2005-046755 DN GeoRef MT "Geology and stratigraphy of the Challis volcanic group and relatedrocks, Little Wood River area, south-central Idaho, with a section ongeochronology" AU "Sanford, Richard F; Snee, Lawrence W" AF "U. S. Geological Survey, USA, United States" SP "USGS, Publications of the U. S. Geological Survey" SO "U. S. Geological Survey Bulletin, Report: B 2064-II, 22 pp., May 2005" RL [U RL http://pubs.usgs.gov/bul/2064/ii] IS 8755-531X RP B 2064-II DE breccia; Cenozoic; Challis Volcanics; Eocene; Idaho; igneous rocks;lava flows; lithostratigraphy; Little Wood River valley; Paleogene;pyroclastics; south-central Idaho; Tertiary; tuff; United States;USGS; volcanic rocks; volcaniclastics AB "The Challis volcanic field is the largest of several Eocene volcanicfields in the Pacific Northwest of the United States and Canada. Inthe Little Wood River area of Idaho, rock types in the Eocene ChallisVolcanic Group include andesite lava flows and tuff breccia, dacitelava flows and flow breccia, volcaniclastic sedimentary rocks, lithictuff, nonvolcanic conglomerate, and rhyolite dikes." LA English NT "Accessed on July 6, 2005; includes appendix" FE "References: 63; illus. incl. sect., 1 table, geol. sketch maps" PY 2005 PT Serial; Report; Monographic CP United States USA FC WWW LL "Latitude:N432500,N434500 Longitude:W1135500,W1141500" CL 05A Igneous and metamorphic petrology; 12 Stratigraphy CY "GeoRef, Copyright 2005, American Geological Institute." UD 2005 AN 2005-046755 Sample Data Item SiO2 TiO2 Al2O3 Fe2O3T MnO MgO CaO Na2O K2O P2O5 LOI Total Age Max_age Min_age Age Max_age Min_age Age Max_age Min_age Location_Name Volcanic_Field Material Rock_Class Rock_Type Sample_Description LatDD LongDD Loc_prec Location_Quad Age Max_age Min_age State Units wt % wt % wt % wt % wt % wt % wt % wt % wt % wt % wt % wt % Ma Ma Ma Ma Ma Ma Ma Ma Ma DD DD Ma Ma Ma Method 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 3 3 3 4 4 4 5 5 6 6 6 Sample Name 7H10A 55.3 0.81 13.41 9.4 0.15 5.93 7.57 2.93 2.62 0.31 1.36 99.79 Little Wood River area Challis Volcanic Group whole rock high K basaltic andesite volcanic contains plag and olivine 43.5343 -114.1781 0.01 Baugh Creek SW 51 48 ID 7H13 53.69 0.85 13.49 9.05 0.14 5.71 7.74 2.58 2.92 0.36 3.67 100.2 Little Wood River area Challis Volcanic Group whole rock high K basaltic andesite volcanic contains pyroxene 43.5484 -114.1781 0.01 Baugh Creek SW 51 48 ID 7H18 53.47 0.97 12.92 10.26 0.16 4.6 8.7 2.99 2.4 0.46 2.88 99.81 Little Wood River area Challis Volcanic Group whole rock high K basaltic andesite volcanic "contains plag, pyroxene, and olivine" 43.5203 -114.1381 0.01 Baugh Creek SW 51 48 ID 7H20 53.15 0.8 13.19 8.84 0.15 8.97 8.21 2.1 1.75 0.22 2.29 99.67 Little Wood River area Challis Volcanic Group whole rock high K basaltic andesite volcanic contains olivine 43.5203 -114.1381 0.01 Baugh Creek SW 51 48 ID 7H22A 56.24 0.77 17.72 5.85 0.05 1.83 5.74 1.82 1.98 0.28 8.39 100.67 Little Wood River area Challis Volcanic Group whole rock "high K basaltic andesite, tuff" volcanic "contains plag, quartz; altered" 43.4044 -113.9621 0.01 Lake Hills 51 47 ID 7H59 52.9 0.98 11.74 8.96 0.14 4.72 7.67 2.22 3.87 0.58 6.62 100.4 Little Wood River area Challis Volcanic Group whole rock shoshonite volcanic contains plag and pyroxene 43.5348 -113.9801 0.01 Mackay SW 51 47 ID 7H22B 60.52 0.7 16.46 4.46 0.04 1.33 3.68 1.8 3.53 0.23 7.84 100.59 Little Wood River area Challis Volcanic Group whole rock "high K andesite, tuff" volcanic 43.4044 -113.9621 0.01 Lake Hills 51 47 ID 7H64 57.91 0.65 14.13 7.08 0.1 6.34 6.37 3.16 2.12 0.17 1.62 99.65 Little Wood River area Challis Volcanic Group whole rock high K andesite volcanic aphanitic; rare plagioclase 43.4768 -114.1381 0.01 Seamans Creek 51 47 ID 7H49 58.48 0.93 14.19 7.78 0.1 3.64 5.05 2.96 4.06 0.37 1.86 99.42 Little Wood River area Challis Volcanic Group whole rock banakite volcanic abundant pyroxene 43.5637 -113.9801 0.01 Mackay SW 51 47 ID 7H58 58.54 0.99 14.36 7.84 0.13 1.72 5.69 2.51 4.07 0.44 3.37 99.66 Little Wood River area Challis Volcanic Group whole rock banakite volcanic "crystal-poor, with pyroxene" 43.5348 -113.9801 0.01 Mackay SW 51 47 ID 7H87A 62.61 0.59 14.44 5.25 0.09 2.83 3.75 3.14 4.15 0.26 2.84 99.95 Little Wood River area Challis Volcanic Group whole rock banakite volcanic 43.5781 -113.9801 0.01 Mackay SW 51 47 ID 7H35 63.41 0.69 14.68 4.98 0.05 2.35 3.49 3.2 4.06 0.28 2.55 99.74 Little Wood River area Challis Volcanic Group whole rock high K dacite volcanic abundant biotite and plag 43.4915 -114.1781 0.01 Baugh Creek SW 51 47 ID 7H109 64.83 0.5 14.51 4.79 0.08 2.15 2.86 3.28 3.79 0.18 2.51 99.48 Little Wood River area Challis Volcanic Group whole rock high K dacite volcanic "abundant plag and lesser biotite, hbl, and pyroxene" 43.5928 -114.0391 0.01 Baugh Creek SW 51 47 ID 7H110 65.8 0.53 15.09 4.64 0.07 1.67 3.15 3.44 3.69 0.19 1.81 100.08 Little Wood River area Challis Volcanic Group whole rock high K dacite volcanic "abundant plag and biotite, and lesser hbl" 43.5928 -114.0591 0.01 Baugh Creek SW 51 47 ID 7H21 62.92 0.74 16.49 3.67 0.04 1.47 3.58 3.28 4.83 0.25 2.2 99.47 Little Wood River area Challis Volcanic Group whole rock "trachyte, welded tuff" volcanic "abundant plag, biotite and fiamme" 43.4044 -113.9621 0.01 Lake Hills 48 46 ID 7H22D 63.26 0.69 15.77 4.03 0.06 1.26 3.45 2.62 5.11 0.24 3.33 99.82 Little Wood River area Challis Volcanic Group whole rock "trachyte, vitrophyre" volcanic "contains plag, sanidine, and abundant lithic fragments" 43.4044 -113.9621 0.01 Lake Hills 48 46 ID 7H69 66.17 0.52 14.72 4.23 0.06 1.74 2.46 2.93 4.46 0.21 2.12 99.62 Little Wood River area Challis Volcanic Group whole rock trachyte volcanic abundant plag and biotite 43.5347 -113.981 0.01 Mackay SW ? 48 46 ID 7H34 77 0.27 10.06 1.05 0.03 0.51 0.65 0 7.57 0.1 2.28 99.52 Little Wood River area Challis Volcanic Group ? whole rock "high-silica rhyolite, tuff vitrophyre" volcanic may be part of Idavada Volcanics 43.5629 -114.1781 0.01 Baugh Creek SW 48 46 ID 7H31A 71.64 0.61 12.95 4.23 0.05 0.27 1.48 3.37 4.62 0.11 0.75 100.08 Little Wood River area Idavada Volcanics whole rock "high K rhyolite, welded tuff" volcanic 43.2949 -113.9651 0.01 Carey 15 8 ID 7H31B 69.55 0.58 12.76 4.22 0.06 0.39 1.73 2.87 4.83 0.1 2.51 99.6 Little Wood River area Idavada Volcanics whole rock "high K rhyolite, tuff vitrophyre" volcanic probably altered 43.2949 -113.9651 0.01 Carey 15 8 ID 7H33 45.84 2.51 15.02 14.91 0.2 7.02 10.19 2.41 0.43 0.47 0.55 99.55 Little Wood River area Quaternary basalt whole rock volcanic 43.4334 -113.9811 0.01 Lake Hills 3 0.01 ID 7H126 46.25 1.89 15.84 13.41 0.19 8.56 10.15 2.06 0.22 0.36 0.61 99.54 Little Wood River area Quaternary basalt whole rock volcanic 43.5058 -114.0591 0.01 Baugh Creek 3 0.01 ID 8H121 45.7 45.8 45.6 45.6 45.7 45.5 Little Wood River area Challis Volcanic Group whole rock rhyolite dike volcanic 43.4855 -114.0907 0.1 ID 8H105 47.5 47.6 47.4 Little Wood River area Challis Volcanic Group whole rock dacite volcanic dacite flow dome 43.4855 -114.0907 0.1 ID 8H106 49.4 49.5 49.3 50 51 49 Little Wood River area Challis Volcanic Group whole rock dacite volcanic dacite flow dome 43.4855 -114.0907 0.1 ID 8H141 48 48.1 47.9 Little Wood River area Challis Volcanic Group whole rock lithic-crystal tuff volcanic 43.4855 -114.0907 0.1 ID 8H138 48.22 48.31 48.13 Little Wood River area Challis Volcanic Group whole rock dacite volcanic 43.54 -113.97 0.1 ID 8H140 49.5 49.6 49.4 Little Wood River area Challis Volcanic Group whole rock andesite volcanic 43.4855 -114.0907 0.1 ID Method Data 1 XRF 16 2 AR-AR:SAN 16 3 AR-AR:HB 16 4 AR-AR:BIO 16 5 TABLE 2005-046755 6 REG_COR:UNK 16