IDAHO GEOLOGICAL SURVEY DIGITAL WEB MAP 101 MOSCOW-BOISE-POCATELLO WWW.IDAHOGEOLOGY.ORG GARWOOD AND OTHERS GEOLOGIC MAP OF THE WHITE BIRD QUADRANGLE, IDAHO COUNTY, IDAHO Disclaimer: This Digital Web Map is an informal report and may be CORRELATION OF MAP UNITS Dean L. Garwood, Keegan L. Schmidt, John D. Kauffman, David E. Stewart, revised and formally published at a later time. Its content and format Table 1. Major oxide and trace element chemistry of samples collected in the White Bird quadrangle. may not conform to agency standards. Artificial Alluvial Mass Movement Volcanic Rocks Intrusive Island-Arc Metavolcanic Reed S. Lewis, Kurt L. Othberg, and Peter J. Wampler Major elements in weight percent Trace elements in parts per million Deposits Deposits Deposits Rocks and Metasedimentary Rocks Sample Map m Qam Qas Qaf Qlsa number Latitude Longitude Unit name unit SiO TiO Al O FeO* MnO MgO CaO Na O K O P O Ni Cr Sc V Ba Rb Sr Zr Y Nb Ga Cu Zn Pb La Ce Th Nd Qamo Holocene 2 2 2 3 2 2 2 5 2008 Qafo 082RL 00 45.78555 -116.27168 Bsl a a t of Grangeville Tvg 52.20 1.276 15.36 8.90 0.159 7.53 11.30 2.38 0.74 0.161 57 223 25 219 267 14 245 112 23 11.7 20 67 74 3 20 31 4 Qahg Qaso Qls QUATERNARY Pleistocene 06DG003 45.83366 -116.36833 Gn ra de Ronde R2 Tr g 2 56.51 2.284 14.12 11.31 0.185 3.15 6.79 3.37 1.84 0.444 5 10 30 326 759 47 360 189 36 11.5 21 12 139 10 29 60 6 32 15 Qls 06DG004 45.83374 -116.36745 Gn ra de Ronde R Tr g 56.52 2.297 14.64 12.12 0.140 2.44 6.33 3.50 1.57 0.441 8 11 33 341 775 39 336 196 55 11.5 22 23 150 8 28 48 6 30 Tgr Qam Tgr Tgn Qc 2 2 1 Tgn1 20 1 1 FAULT Qas Tgr Pliocene 2 10 Qaf JPsd Tgn1 T 06DG005 45.83207 -116.36594 Gn ra de Ronde N1 Tng 1 55.68 2.217 14.10 11.93 0.187 3.28 7.00 3.57 1.59 0.438 11 10 34 359 764 38 323 190 42 11.2 21 16 135 7 26 52 4 34 10 45 RUS 25 32 TH Columbia River Basalt Group 06DG006 45.84318 -116.36347 Gn ra de Ronde R2 Tr g 2 54.15 2.296 13.80 13.02 0.211 3.93 7.71 3.08 1.38 0.426 11 18 35 367 620 38 334 167 38 10.0 22 22 128 6 21 44 4 28 10 Saddle Mountains Basalt 06DG008 45.84217 -116.36459 Gn ra de Ronde R Tr g 54.12 2.295 13.76 13.01 0.245 3.68 7.77 3.12 1.56 0.448 11 18 36 371 593 40 330 168 38 10.1 21 22 128 7 21 43 4 28 Tgn Latah Formation 2 2 1 10 20 Tgv Qaf TJd Sediments 06DG009 45.84703 -116.36073 Gn ra de Ronde N1 Tng 1 54.02 2.315 13.70 12.79 0.227 3.99 7.79 3.20 1.53 0.452 14 20 35 374 602 35 332 165 37 10.9 20 22 130 6 22 45 4 26 30 50 40 42 07DG106 45.75481 -116.27532 Bsl a a t of Grangeville Tvg 52.46 1.299 15.52 9.07 0.161 7.32 10.99 2.34 0.68 0.171 62 225 33 231 280 14 240 117 24 10.3 16 67 80 1 19 38 2 20 27 JPsd EK Grande Ronde Basalt CENOZOIC RE A 26 C 07DG120 45.84329 -116.35197 Gn ra de Ronde N1 Tng 1 55.60 2.159 13.73 12.48 0.211 3.41 6.92 3.49 1.57 0.421 12 11 33 357 688 39 310 187 42 11.4 20 19 132 5 21 48 5 29 Tgr1 Miocene Tgr Tgr2 2 TERTIARY 07DG121 45.84381 -116.35135 Gn ra de Ronde R2 Tr g 2 55.54 2.162 13.72 12.52 0.198 3.38 6.93 3.52 1.60 0.427 12 10 33 359 697 40 309 189 41 11.1 21 17 130 6 24 58 5 30 Tgn 1 TJd Tgr Tli Tgn1 07DG127 45.85137 -116.35651 Gn ra de Ronde R Tr g 54.98 2.284 13.78 11.80 0.215 3.96 7.77 3.15 1.66 0.409 11 10 36 380 671 38 330 173 40 11.1 20 19 132 5 21 46 5 26 Tgr2 1 2 2 35 Tgr 07DG128 45.85009 -116.35731 Gn ra de Ronde R Tr g 54.09 2.336 13.75 12.72 0.225 3.93 7.87 3.01 1.61 0.462 14 18 36 377 584 36 335 167 39 9.7 19 23 130 5 21 49 6 27 JPsd 1 2 2 Tgr 07JK016 45.75423 -116.27872 Bsl a a t of Grangeville Tvg 53.16 1.349 15.24 9.01 0.174 6.57 11.12 2.42 0.79 0.165 44 145 33 233 295 16 244 127 24 12.1 17 54 80 3 19 36 4 18 Qaf 2 Imnaha Basalt 35 30 07JK034 45.82903 -116.27606 Gn ra de Ronde N1 Tng 1 55.23 2.065 13.94 11.96 0.199 3.90 7.70 3.08 1.56 0.349 12 10 34 359 594 38 318 179 38 10.4 20 38 123 6 20 46 5 25 Tim 07JK035 45.82876 -116.27782 Gn ra de Ronde R1 Tr g 1 56.01 2.068 14.25 10.81 0.191 3.97 7.58 3.07 1.74 0.316 11 12 32 347 667 47 358 188 35 10.2 20 35 117 7 18 50 6 28 R E Eocene M 07JK076 45.78057 -116.31659 Ihmna a Tim 51.81 3.053 13.60 13.82 0.234 4.33 8.58 3.23 0.89 0.444 21 22 38 394 415 35 265 246 48 16.8 20 85 138 3 25 54 4 32 Tgn1 29 Qam 31 M A Tjd 07JK087 45.77493 -116.26951 Bsl a a t of Grangeville Tvg 52.66 1.290 15.25 10.19 0.285 6.22 10.84 2.39 0.72 0.161 47 145 34 232 490 15 247 121 23 11.6 16 64 79 2 19 35 4 19 H CRETACEOUS 35 Qls Seven Devils Volcanics 37 07KS 18 45.77685 -116.33117 TRPsd 73.08 0.427 13.87 4.18 0.300 0.66 0.61 6.34 0.44 0.105 0 4 14 66 178 6 109 90 33 1.5 15 7 100 4 2 14 3 10 45 Tgr l ithic tuff Tgr1 2 057RL 18 45.78125 -116.35686 Seven Devils Volcanics TRPsd 52.65 1.460 16.30 11.38 0.191 4.76 8.49 3.34 1.24 0.195 18 32 42 407 257 25 233 100 39 1.6 18 12 101 0 10 18 1 15 35 Tgn JURASSIC bsl na a tic a desite Tgr2 35 TJd 1 MESOZOIC * Major elements are normalized on a volatile-free basis, with total Fe expressed as FeO. 33 KPdg B 29 Qafo JPsd All analyses performed at Washington State University GeoAnalytical Laboratory, Pullman, Washington. 34 TJd Qamo TRIASSIC 51 66 PERMIAN PALEOZOIC 65 Qamo TJd 07DG127 Qam Qamo KPdg Qaf JPsd 07DG128 48 45 06DG009 Qaf Tgn1 Tgn1 20 Qamo INTRODUCTION SYMBOLS 077DDG121 Qls 066DDG006 07DG120 Tgr 2 30 Qam Tgn1 footwall has been deformed into open, shallowly south-southeast- 06DG008 Tim The geologic map of the White Bird quadrangle depicts rock units Qls Landslide deposits (Holocene and Pleistocene)—Poorly sorted and poorly Imnaha Basalt Contact: dashed where approximately located. Tgr 20 1 Qam Qaf exposed at the surface or underlying thin surficial cover of soil and stratified angular basalt cobbles and boulders mixed with silt and clay. plunging folds with amplitudes of hundreds of meters. Splays of the Tim Imnaha Basalt (Miocene)—Medium- to coarse-grained, sparsely to Hammer Creek thrust occur in rocks of the footwall both north and south Fault: bar and ball on downthrown side; dashed where TJd colluvium. Thicker surficial alluvial, colluvial, and landslide deposits are Deposited by slumps, slides, and debris flows. In addition, the unit may Qaf approximately located; dotted where concealed. Qls also shown where they mask or modify the underlying rock units or form include the landslide scarp and the headwall (steep area adjacent to and abundantly plagioclase-phyric basalt; olivine common; plagioclase of Hammer Creek Bar. Near Shorts Bar, this fault thrusts the lower package phenocrysts generally 0.5-2 cm long but some as large as 3 cm. Normal of island arc rocks westward over rocks of the upper package. The Qamo significant mappable units. The plateau soils include loess parent material below the landslide scarp) from which material broke away (see Symbols). Thrust fault: dashed were approximately located; dotted magnetic polarity. Weathers to a sooty brown granular detritus.