Index [Italic page numbers indicate major references]

A amphibolite (continued) apparent polar wander, 1, 12, 13, 28, Academy pluton, 204, 219, 220 Cariboo Mountains, 165 31, 33, 203, 221 accretionary complexes, 8 Clipper Mountains, 378 arc magmatism, Stikinia, 92 actinolite Coast Plutonic complex, 103 arc terranes, collision of, 1 Humboldt igneous complex, 242 Cogburn Creek unit, 100 arc volcanism, 3 Klamath Mountains, 182 Elk Creek, 178, 179 Pine Nut Range, 234 adularia, 24, 25 Franciscan Complex, 30 arc-graben, Central America, 347 Aishihik Batholith, Yukon, 65, 67 Hornet Creek Gneiss, 100 Arctic Alaska terrane, 21 emplacement, 65 Klamath Mountains, 173, 174, 175, Arctic Ocean, 34 shape of, 78 177, 182, 183, 186, 188 arenite, Colorado Plateau, 409 structure of, 73 May Creek terrane, 178 argillic alteration, Barneys Canyon, Aishihik Lake area, 75, 78 Owens Mountain area, 205 320 Aishihik Plutonic Suite, 65, 66 Pemberton Dioritic complex, 111 argillite, 8 Aja fracture zone, 17 Pilot Range, 279 Cogburn Creek unit, 100 Aksala Formation, Lewes River Group, Red Mountain, 177 Humboldt igneous complex, 234 50 Wood Hills, 281 Kaslo Group, 162 Alaska Highway conglomerate, 53 anatexis, crustal, southeast British Milford Group, 162 Alaska Range, 29 Columbia, 142 Argillite thrust, 143 Albion Mountains, 281, 287, 289 Anchor fault, 301, 303, 305 argon, Spuzzum intrusion, 107 albite andalusite Arguello plate, 31 arsenic Aishihik Batholith, 73, 75 Emigrant Gap composite pluton, Humboldt igneous complex, 242 194 Barneys Canyon, 319 Klamath Mountains, 177, 183, 184 Klamath Mountains, 173, 182, 183, Oquirrh Mountains, 314 Aleutian Arc, 4 184, 185 Ashlu Creek body, 105, 106 Aleutian Trench, Alaska, 17 Pilot Range, 278 Ashlu Creek fault, 104, 107, 110 Ashlu Creek shear zone, 100, 106 magnetic bight, 17 Andes Mountains, Peru, 9, 290 assimilation, southeast British Alexander terrane, 125, 168 andesine Columbia, 141, 142, 153 alkali feldspar Aishihik Batholith, 67 asthenosphere, 27, 31, 93, 249 Clipper Mountains pluton, 356 Klamath Mountains, 177 Atlanta lobe, Idaho batholith, 32 Laberge Conglomerate, 51 Owens Mountain area, 207, 209, Atlantic hotspot, 2 Mojave Desert, 356 213 Atlantic Ocean, 33 Ship Mountains pluton, 355 andesine-bytownite, Owens Mountain Spatsizi River Stock, 89 area, 207 central, formation of, 33 alkalic diorite andesite Atlas fault, 304, 305 Bonnington Pluton, 150 Cortez Mountains, 284 augite Nelson Batholith, 150 Cow Creek volcanic arc, 188 Humboldt igneous complex, 242 alkalic rocks, 23 Cowhole volcanics, 338 Lewes River arc, 49 alkalic syenite, Kuskanax Batholith, Humboldt igneous complex, 229, Povoas Formation, 52 150 234, 235, 241 augite quartz monzonite, Melrose allanite Laberge Conglomerate, 51 intrusion, 299 Aishihik Batholith, 67 Pinon Range, 284 Avawatz Mountains, 340 Clipper Mountains pluton, 356 andesitic arcs, 5. See also volcanism, Aztec quartzite, 343 Mojave Desert, 356 andesitic arc Aztec Sandstone, 296, 299, 310, 327, Allison seamount, 2 anthophyllite, Klamath Mountains, 329, 332, 334, 339, 347 almandine, Owens Mountain area, 213 177 glide blocks, 345 Alps, 27 antimony landslides, 345 aluminum, northeastern Great Basin, Barneys Canyon, 319 stratigraphy, 344 270 Oquirrh Mountains, 314 tectonics, 344 Alwin Creek porphyry dike, 161, 163, Antler orogenic belt, 290 165 Antler orogeny, 253, 254 B ammonites apatite Mount Brock volcanics, 87 Aishihik Batholith, 67 Badshot Formation, 161, 162 Whitehorse Conglomerate, 54 Clipper Mountains pluton, 356, 370 Baker, California, 327 ammonium-illite, Oquirrh Mountains, Mojave Desert, 356 barite 316 aphanite, Cowhole Mountains, 335 Barneys Canyon, 331, 332 amphibole aphibolite, Clipper Mountains, 378 Oquirrh Mountains, 314 Humboldt igneous complex, 237 aplite barium Klamath Mountains, 177, 182, 183 Aishihik Batholith, 67, 71, 73, 75, Barneys Canyon, 319 Owens Mountain area, 220 78 Mojave Desert, 354 amphibolite Hobson Lake pluton, 166 Barkerville subterrane, Kootenay Aishihik Batholith, 71, 75 Melrose intrusion, 300 terrane, 165, 168

413

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Barneys Canyon, gold deposit, 313 biotite (continued) Bolivia Spring, 236, 240 barometric studies Horseshoe Bay, 104 Bonanza Formation, Vancouver Island, northeastern Nevada, 267 Humboldt igneous complex, 236, 101 northwestern Utah, 267 237, 242 Bonanza Group, Vancouver Island, 100 basalt Klamath Mountains, 173, 182, 183, Bonanza King Formation, 378, 387 alkalic, 8 184, 185 Bonanza-Island Intrusion, 125 Cow Creek volcanic arc, 188 Mojave Desert, 356, 382 Bonanza-Island Intrusion arc, flood, 1. See also flood basalts Mount Jasper, 104 Wrangellia, 95, 101, 125 Humboldt igneous complex, 229, northeastern Great Basin, 270 Bonnington Pluton, 143, 149, 150, 235, 239, 241 Owens Mountain area, 205, 207, 151, 152 Karmutsen Formation, 101 210, 213, 220 Boston Bar Formation, 99 Kaslo Group, 162 Pilot Range, 278 boudinage, Aishihik Batholith, 71, Orocopia Schist, 30 Princess Royal Reach granodiorite, 75, 78 tholeiitic, 8 117 Boulder batholith, 32 Western Klamath terrane, 178 Ryan River, 105 Bowen Island Group, 100, 101, 103, xenoliths, 52 Sechelt Peninsula, 104 104, 105, 120, 123, 125 basaltic andesite Ship Mountains pluton, 355 Bowman Lake-Cisco Grove area, 232 Griffith Creek volcanics, 90 Silver Island Mountains, 271 Bowser Basin, 84, 87, 92, 168 Humboldt igneous complex, 229, southeast British Columbia, 143 Bowser Lake Group, 92 235 Taono Range, 280 Boyer Ranch Formation, 231, 235, Laberge Conglomerate, 51 White Rock pluton, 178 236, 241, 242, 246 Lewes River arc, 49 biotite gneiss, Clipper Mountains, Boyer Thrust, 235 Povoas Formation, 52 377 Bralorne-Kwoiek Creek fault systems, Basin and Range province, 12, 24, 27, biotite granites 99 30 Ladybird stock, 151 Bridge River Group, 96, 99, 123 formation of, 2 Melrose intrusion, 299 Bridge River terrane, 96, 99, 125, 127, Bass Lake pluton, 204, 210, 219 biotite granodiorite 169 batholiths, 9, 15 Bayonne Batholith, 143 Bristol Mountains, 340, 345, 353, creation of, 1 Big Julie pluton, 120 388 defined, 9 Elbow Lake, 104 Brittain River, 120 formation of, 31, 32 Malispona pluton, 110 Brooks Range, Alaska, 19 major, 32 Quarry Bay intrusion, 111 Brooks Range fold and thrust belt, Sierra Nevada, 9 biotite-hornblende granodiorite, shortening, 21 See also specific batholiths southeast British Columbia, 143 Bunker Hill Stock, 143 Bayonne Batholith, 143, 149, 150, biotite-hornblende quartz diorite, Bute Inlet, 110 151, 153 Friday Creek, 57 Butte Mountains, 308 Bear Mountains fault zone, 25, 203, biotite monzogranite, Melrose Butte synclinorium, 308 204, 205, 212, 218, 219, 220, intrusion, 299 bytownite-anorthite, Owens Mountain 222, 223, 224, 225 biotite-muscovite granite area, 209, 213 Bear Mountains igneous complex, Bayonne Batholith, 143 243 Windermere Supergroup, 166 C Bear Mountains ophiolitic mélange, biotite-muscovite leucogranite, Consumnes River area, 232 southeast British Columbia, 143 Cache Creek subduction complex, 160 Bear Peak pluton, 178 biotite-muscovite schist, Owens Cache Creek Terrane, 67, 80, 81, 84 Bendor pluton, 99, 120 Mountain area, 205 obduction, 92 Bennett Batholith, 52, 80 biotite-quartz monzonite, Ladybird Cache Creek terrane, 159, 168 bentonite Suite, 143 Cadwallader arc, 125 Carmel Formation, 394, 397, 399, biotite schist, Owens Mountain area, Cadwallader Group, 99, 115, 117, 120, 405 205, 220 126 Navajo Sandstone, 405, 406 biotite tonalite Cadwallader terrane, 96, 99, 127, 168 Page Sandstone. 399. 405, 406 Bendor pluton, 120 Calaveras Complex, 199 Bering Sea, 29 Princess Louisa pluton, 107 calc-alkalic andesite, Challis magmatic floor, 17 Stave Glacier intrusion, 117 belt, 24 Big Bend area, 232 Bird Spring block, 345 calc-alkalic granodiorite, southeast Big Julie pluton, 107, 111, 120 Bird Spring Formation, 329, 345, 388 British Columbia, 150 Bingham mining district, Utah, 313, Bisbee Basin rift, 23, 33 calcarenite, Humboldt igneous 314, 317 Bishop Tuff, 407 complex, 234 Bingham porphyry copper deposit, Bitterroot lobe, 17, 28, 32 calcite 314 Black Bluff thrust, 143 Laberge Group, 56 Bingham Sequence, 317 Blackhawk fold, 301, 303, 308, 310 Mojave Desert, 356 biotite Blackhawk monocline, 307 Pilot Range, 278 Aishihik Batholith, 67, 73, 78, 79 Blind Hills, 378, 380, 382 calderas, 9 Aishihik Plutonic Suite, 66 blueschist, 8, 29, 31 Andes Mountains, 9 Clipper Mountains pluton, 356 Bridge River Group, 99 formation of, 1, 31, 92 Cow Creek, 179 Feather River peridotite belt, 192, Hazelton Trough, 92 Cowhole Mountains, 336 199 Camp Cove Formation, 125 Cowhole Pluton, 336 Franciscan Complex, 30 Canadian Basin, formation of, 21 Griffith Creek volcanics, 90 Shuksan Metamorphic Suite, 24 Canadian Cycle, 17, 32

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Cannonville, Utah, 407 chlorite (continued) Colorado Plateau, 296, 333, 334, 389, carbonate Toano Range, 280, 281 393 Aztec Sandstone, 332 Chocolate Mountains thrust, 30 clay mineralogy, 401 Barneys Canyon, 313, 319 chrome spinel, Klamath Mountains, rotation of, 5 Cowhole Mountains, 329 182 sedimentology, 395 Oquirrh Mountains, 314 chromium, Mojave Desert, 354 stratigraphy, 395 Caribbean cycle, 22 Chuckwalla Spring, 378 Colton Hills, 388 Caribbean region, 19 Chuckwalla Spring pluton, 356, 380, Columbia River Basalt Group, Oregon, Cariboo Mountains, British Columbia, 382, 383, 385, 386, 387 12, 24 159, 160, 161, 165, 168 Chukotsk Peninsula, Alaska, 19 Conglomerate Formation, Laberge Cariboo Region, British Columbia, Cima volcanic field, 345 Group, 50 12, 24 Cinnabar Creek area, 99 Consumnes River area, 232 Carmel Formation, Colorado Plateau, Clan Alpine Mountains, 234 Contact pluton, 284 393 Clark Mountains, 388 Coon Mountain pluton, 178 sedimentology, 395 Clemens Well-Fenner-San Cooper Creek stock, 160, 163, 165 stratigraphy, 395 Francisquito fault, 17 Copper Hill Formation, 205, 218 Carmel Seaway, 409, 410 Clendenning pluton, 111 Copperton anticline, 313, 317, 319, Carmel-Twin Creek seaway, 395 clinopyroxene 324 Carson Sink basin, 235 Clipper Mountains pluton, 356 cordierite, Emigrant Gap composite Cascade metamorphic core, Humboldt igneous complex, 239 pluton, 194 Washington, 100 Klamath Mountains, 177, 182 Cortez Mountains, 255, 269, 284 Cascade Mountains, 17, 24, 96, 127 Laberge Group, 56 Coryell Suite, 143 Castle Towers pluton, 111 Owens Mountain area, 205, 207 Cottonwood Canyon, 236, 237 Catalina schist, 30 southeast British Columbia, 141, dike swarm, 240 Cayoosh Assemblage, 99, 120, 123 145, 148, 150, 152, 153 Cottonwood Springs syncline, 280 Cedar Mountain ophiolite, 30 clinopyroxene-biotite hornblendite, Courthouse Rock tonalite, 219 Cedar Springs Mountain thrust fault, Clipper Mountains, 378 Cow Creek, 173, 174, 175, 177, 178, 173, 174, 177, 178, 180, 183, Clipper Mountains, California, 352, 179, 183, 185, 186 186, 188 375 Cow Creek amphibolite, 178, 188 Central belt, Franciscan Complex, 30 geobarometry, 385 Cow Creek volcanic arc, 188 Central Metamorphic belt, Sierra structure, 382 Cowhole allochthon, 340 Nevada, 29 tectonics, 388 Cowhole dike swarm, 339 cerium, Mojave Desert, 354 Clipper Mountains pluton, 351, 353, Cowhole fault, 329, 332, 336, 340 Challis magmatic belt, 24 356, 357, 359, 363, 364, 369, Cowhole Mountain block, 340 Charleston allochthon, 316 370 Cowhole Mountains, 234, 327, 407 Charleston-Nebo-Strawberry thrust, Cloudburst pluton, 103, 105, 106 Cowhole Pluton, 336, 339, 344 316 Clover Hill, 281, 389 Cowhole volcanics, 327, 334, 336, Charleston thrust, 316 Coast Belt 338, 339, 345, 347 Cheakamus Canyon, 105 central, 99, 111, 115, 117, 127 faults, 339 chert, 8 eastern, 96, 123 Crater Island, 271, 277, 280, 288, Bridge River Group, 99 southern, British Columbia, 95, 169 307, 308 Cogburn Creek unit, 100 geochronology, 95 faults, 308 Franciscan Complex, 30 zircons, 95 Crater Island pluton, 271 Orocopia Schist, 30 western, 95, 100, 101, 106, 107, Cronese Hills, 328, 339, 388 Plympton Formation, 296 111, 125 crossite, 30 Thaynes Formation, 303 Coast Belt Detachment, 100 crustal foundering, Hazelton Trough, Chiapas Shear Zone, 327, 347 Coast Belt thrust system, 95, 96, 99, 92 Chihuahua Trough, Mexico, 12, 33 111, 115, 117, 120, 126 crustal shortening, 23. See also Chilikadrotna Greenstone, Alaska, 12 Coast Plutonic Complex, 19, 33, 50, shortening Chilkat metabasalt, 12 95, 96, 101, 115 Crystal Creek Member Chinle Formation, 252, 296, 297, Coast Plutonic Complex intrusive Carmel Formation, 395, 400, 407, 405, 409 suite, 125 409, 410 Chiwaukum Schist, 100 Coast Range, 96, 174, 221 Page Sandstone, 400 chlorine, Humboldt igneous complex, Coast Range megalineament, 27 crystallization, 203, 225 242 Coast Range Ocean Floor, 28, 29 Aishihik Batholith, 71, 78, 79 chlorite Coast Range ophiolite, 25, 28, 29, 30, Cold Fish Volcanics, 89 Aishihik Batholith, 67 33, 221, 222 Humboldt igneous complex, 242 Clipper Mountains pluton, 356 Coconino Sandstone, 409 Nelson Batholith, 149 Cowhole Mountains, 336 Cocos plate, 31 Owens Mountain area, 220 Cowhole Pluton, 336 coesite, 29 Pitt Lake pluton, 104 Humboldt igneous complex, 242 Cogburn Creek unit, 99, 100 southeast British Columbia, 141, Klamath Mountains, 173, 175, 182, Cold Fish rhyolites, 83, 93 142, 152 183, 184 Cold Fish Volcanics, 84, 85, 86, 87, southern Coast Belt, 96, 101 Laberge Conglomerate, 52 90, 91, 93 Squamish pluton, 104 Mojave Desert, 356 age determinations, 87 Currie Canyon, 305, 307 Oquirrh Mountains, 316 crystallization, 87 Currie Hills, Nevada, 295, 305 Pilot Range, 278 geochronology, 91 folds, 301, 305 Spatsizi River Stock, 85 Colorado Mineral Belt, 18 structure, 301

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Currie, Nevada, 252, 268, 295, 296, diorite (continued) F Ship Mountains pluton, 355 297, 308 Farallon plate, 8, 9, 24, 29, 31, 33, Dixie Valley basin, 235 Curry Peak Formation, 317 353 Cypress Bowl intrusion, 111 Dolly Varden Mountains, Nevada, 274, rapid subduction, 15 285, 295 rate of motion of, 2 faults, 301, 307, 308 subduction of, 2 D structure, 301 Farewell fault, 19 Dolly Varden Spring, 296, 301 dacite faulting, 182 dolomite, Plympton Formation, 296 Challis magmatic belt, 24 Basin and Range province, 303 Dryden anticline, 163 Cowhole Mountains, 335 Pacific Northwest, 24 Humboldt igneous complex, 229, western Canada, 29 234, 235 E See also faults Daisetsu volcanics, Japan, 243 faults Darrington Phyllite, 100 Eagle Hill rhyolite, 314 Aztec Sandstone, 340 Davis assemblage, Milford Group, Eagleridge granodiorite, 104 Cowhole volcanics, 339, 340 162, 163 East Humboldt Range, 254, 281, 287, Crater Island, 308 Deep Creek Mountains, 277 289 Dolly Varden Mountains, 295, 301, deformation, 19, 25, 34, 182, 203, East Pacific Rise, 1, 2, 15, 25, 31 307, 308 225 East Sechelt pluton, 103, 105, 107 northeastern Great Basin, 285 Aishihik Batholith, 72 East Sechelt quartz diorite, 111 White Horse Mountains, 277 Dolly Varden Mountains, 295 Eastern Mojave Shear Zone, 340, 347 See also faulting Mojave Desert, 376 eclogite, 29 Feather River peridotite belt, 191, Nevada Jurassic Magmatic Province, Franciscan Complex, 30 192, 197, 198, 199 260, 262 Venezuela, 22 feldspar northern Great Basin, 249, 250, Elbow Lake, 104 Aishihik Batholith, 65, 73, 75, 78, 253, 259 Elbow Lake Formation, 100 79 Oquirrh Mountains, 314 Eldred River Valley, 120 Humboldt igneous complex, 237 southeastern Canadian Cordillera, Elk Creek, 173, 177, 178, 179, 183, Klamath Mountains, 183 159 185, 186, 188 Mojave Desert, 382 Del Puerto ophiolite, 30 Elk Creek amphibolite, 188 Povoas Formation, 52 delamination, lithospheric, 27 Elk Creek drainage, 174 felsite, Pinon Range, 284 Delano Mountains, 307 Elk Creek peridotite, 177 Fencemaker thrust, 235 Delfonte sequence, 334 Elk Creek protolith, 186 Fencemaker thrust fault, 253, 254 Devils Flat, 182 Elkhorn volcanics, 32 Ferguson Mountain Formation, 296, Devils Playground, 328, 388 Elko County, Nevada, 295 305 Dewdney Creek Formation, 99, 125 Elko orogenic belt, 253, 255 fibrolite diabase dike, Western Klamath terrane, Elko orogenic uplift, 324 Klamath Mountains, 183 178 Elko Orogeny, 310, 315, 410 Pilot Range, 278 diamond, 29 Emigrant Gap composite pluton, 191, Fine Gold Intrusive Suite, 27 Dickson Peak pluton, 111 192, 193, 194, 197, 199 Fire Lake, 100 dike swarms, 23, 351 Endako, Canada, 18 flood basalts, 24, 25, 27, 31 Aishihik Batholith, 71 Entrada Sandstone, 395 formation of, 1 Humboldt igneous complex, 246 epidote fluids, 31 Mojave Desert, 355 Aishihik Batholith, 67, 71 circulation of, 1 Owens Mountain. 203 Clipper Mountains pluton, 356 role of, 27 Sierra Nevada Foothills terrane, 203 Humboldt igneous complex, 242 fluorine, Hazelton Trough, 83, 93 Silver Island Mountains, 271 Klamath Mountains, 182 fluorite See also dikes Owens Mountain area, 207, 213, Mojave Desert, 356 dikes 215 Spatsizi River Stock, 85, 86 Crater Island, 271 Pilot Range, 278 folding, 182 Gold Hill, 277 epidote/clinozoisite, Klamath Cow Creek, 182 Melrose intrusion, 300 Mountains, 177 Cowhole volcanics, 343 Silver Island, 271 erosion, northeastern Great Basin, décollement, 5 See also dike swarms 289 Elk Creek, 182 Dinwoody Formation, 296 Escalante region, 395 times of, 5 diopside Eureka-Quesnel Lake thrust, 165, 166, Wildcat Ridge, 182 Cowhole Mountains, 336 168 See also folds Pilot Range, 278 Explorer plate, 31 folds diorite extension, 11, 25, 31 Aishihik Batholith, 75 Aishihik Plutonic Suite, 66 Basin and Range province, 27 Currie Hills, 295, 301, 308, 310 Clipper Mountains, 378 Cowhole volcanics, 343 Dolly Varden Mountains, 295 Clipper Mountains pluton, 356 evidence for, 12 Gold Hill, 277 Coast Plutonic complex, 101 northeastern Great Basin, 287, 288, northeastern Great Basin, 285 Coryell Suite, 143 291 Pilot Range, 286 Humboldt igneous complex, 229, Pacific Northwest, 24 See also folding 235, 241. 242 trench-normal, 1, 12, 15, 31 foliation, White Rock, 182 Mojave Desert, 356 White Horse Mountains, 277 Folsom dike swarm, 204, 221, 222, Owens Mountain area, 207 extrusion, 25 225

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Foothills fault system, 191, 192, 197, Goodsprings Dolomite, 329, 333, Great Basin, northeastern (continued) 200 337, 339, 345, 346 thickening, 267 Foothills metamorphic belt, 5 Gopher Ridge Formation, 205, 218, northern, 249 Foothills terrane, 204, 205, 210, 212, 219 deformation, 249, 250, 253, 259 218, 219, 220, 224 Gopher Ridge volcanics, 218 metamorphism, 253 fossils, 31 Goshute Mountains, 274 plutonism, 249, 250, 259 Bridge River terrane, 125 Goshute-Toano Range, 308 stratigraphy, 252 Humboldt igneous complex, 232 Grand Forks horst, 148 western, 246 Oquirrh Mountains, 316 granite, 26 Great Blue Limestone, 313, 316 Sailor Canyon Formation, 197, 199 Coast Plutonic complex, 101 Great Salt Lake Desert, 295 Salt Spring Formation, 205 Coryell Suite, 143 Great Valley, California, 28, 33, 221 Franciscan Complex, 25, 28, 30 Humboldt igneous complex, 234 Great Valley sequence, 30 Fraser fault, British Columbia, 12, 96, Laberge Conglomerate, 51 Green Butte, 182 100, 125, 126 Mojave Desert, 380 Greenland-Norwegian Sea, 34 Fraser River, 100 Newfoundland Mountains, 270 greenschist Fraser River fault system, 100 northern Utah, 269 Aishihik Batholith, 71 Fraser River Lowlands, 96 origin of, 26 Bridge River Group, 99 Fraser River Valley, 100, 104 rapakivi, 26 Klamath Mountains, 182, 183, 184 Frenchie Creek Rhyolite, 284 Ruby Mountains, 281 Owens Mountain area, 213, 220 Friday Creek, 57 Ship Mountains pluton, 355 Pilot Range, 279 Furry Creek pluton, 111 southeast British Columbia, 143, Sailor Canyon Formation, 193 153 Shuksan Metamorphic Suite, 24 White Rock pluton, 177 Wood Hills, 281 G granite augen gneiss, Clipper greenstone gabbro Mountains, 377 Cow Creek, 175, 178, 188 Humboldt igneous complex, 234, granite gneiss, Clipper Mountains, Klamath Mountains, 173, 174 241 377, 378 Greenwood area, 165 Mojave Desert, 356 Granite Mountains, 353, 388 Griffith Creek volcanics, 83, 84, 85, Western Klamath terrane, 178 granitoids 87, 91 See also hornblende gabbro, olivine British Columbia, 141 age determinations, 90 gabbro eastern Coast Belt, 100 geochronology, 91 Galice Formation, 174, 178 granodiorite, 8 Grouse Creek Mountains, 281, 287 Gambier Assemblage, 100, 104, 105, Aishihik Batholith, 67, 70, 71, 73, Guadalajara, Mexico, 15 106, 111, 115, 117, 120, 126, 75 Guadalupe igneous complex, 219, 222 127 Clipper Mountains pluton, 356 Guadalupe plate, 24, 31 Gambier Island, 103, 104 Cloudburst pluton, 105 Guerrero terrane, Mexico, 28 Garibaldi area, Coast Belt, 96 Cow Creek, 179 Gulf of California, 24, 28 Garibaldi belt, 100 Cypress Bowl intrusion, 111 formation of, 17 garnet Hobson Lake pluton, 166 Gulf of Mexico, formation of, 33 Cowhole Mountains, 336 Humboldt igneous complex, 236, gulfs, 28 Klamath Mountains, 182, 183, 184, 242 185 Laberge Conglomerate, 51 Gunlock, Utah, 399, 409 Owens Mountain area, 205, 213 Mojave Desert, 380 Pilot Range, 278 Mount Jasper pluton, 104 Taono Range, 280 Newfoundland Mountains, 271 H garnet-muscovite-quartz diorite, White Pemberton Dioritic complex, 111 hafnium, Clipper Mountains pluton, Rock pluton, 177 Sackinaw Lake body, 111 370 Gerster Formation, 296, 304, 305 Sechelt pluton, 105 Halfway Hill, 379 Giant Mascot deposit, Spuzzum Silver Island Mountains, 271 Hall Formation, 163, 165, 168 intrusion, 107, 115 southeast British Columbia, 143 Halloran Hills, 328 Glen Canyon, 345 Spetch Creek pluton, 117 Halloran summit, 345 Glen Canyon Group, Colorado Plateau, Thornbrough intrusion, 104 Hamill Group, 161, 162 334, 409 Valhalla Complex, 143 Happy Creek igneous complex, 234 gneiss, Settler Schist, 100 White Horse Mountains, 277 Harris Wash Member, Page Sandstone, Goat Lake diorite, 107 White Rock pluton, 177 395 Harrison Lake, 96, 100, 101, 127 Golconda allochthon, 8 Windermere Supergroup, 166 Harrison Lake Formation, 100, 101, gold Grants Pass pluton, 178 104, 123, 125 Alaska, 27 graphite Harrison Lake shear zone, 111 Barneys Canyon, 313 Klamath Mountains, 183, 184 harzburgite, Western Klamath terrane, Oquirrh Mountains, 314 Pilot Range, 278 178 Gold Hill, 277, 285, 288, 308 graywacke, 25 harzburgite tectonite, Shulaps Humboldt igneous complex, 232 Gold Hill pluton, 178 complex, 99 Kaslo Group, 162 Goldhammer lobe, Clipper Mountains, Havallah sequence, 8 Orocopia Schist, 30 356 Haypress Creek pluton, 191 Goldhammer Mine, 377, 378, 380, Great Basin, 8, 231 Hazelton Group, 83 381, 385, 387, 388 northeastern, 307, 308, 310 Hazelton Trough, British Columbia, 83 Goldhammer pluton, 356, 375, 378, magmatism, 267 caldera formation, 92 380, 381, 382, 383, 385 shortening, 267, 268 crustal foundering, 92

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Hazelton Trough, British Columbia hornblende gabbro Insular morphotectonic belt, 96 (continued) Clipper Mountains pluton, 356 Insular Superterrane, 95, 100, 125, geochronology, 87 Humboldt igneous complex, 229, 126, 127 stratigraphy, 85 235 Interior Basin, 33 thermal subsidence, 92 Owens Mountain area, 205, 207, Intermontane Belt, 65, 67, 96 heavy rare earth elements 211, 218 Intermontane Superterrane, 80, 95, 99, Clipper Mountains pluton, 370 Ship Mountains pluton, 355 100, 125, 126, 127 Humboldt igneous complex, 242 hornblende granodiorite iron, northeastern Great Basin, 270 hematite Aishihik Plutonic Suite, 66 iron oxides, Oquirrh Mountains, 316 Aishihik Batholith, 67 Stikinia, 66 iron-titanium oxide Cowhole Mountains, 336 Sumas Mountain, 104 Cowhole Mountains, 335 Henry Mountains, 394, 400, 407, 410 Whitehorse Trough, 52 Cowhole Pluton, 336 Hess rise, 2 hornblende metatonalite, Owens Cowhole volcanics, 338 Hobson Lake pluton, 161, 166, 168 Mountain area, 207 Owens Mountain area, 220 Holbrook, Arizona, 409 hornblende monzodiorite, Silver Island Ivanpah Mountains, 334 Holbrook Member, Moenkopi Mountains, 271 Formation, 409 hornblende quartz diorite hornblende Laberge Conglomerate, 51 J Aishihik Batholith, 65, 67, 73, 78, Misty Lake intrusion, 120 Jackson Meadow Reservoir, 194 79 hornblende quartz monzonite, Melrose Jackson Mountains area, Nevada, 234, Aishihik Plutonic Suite, 66 intrusion, 299 250 Clipper Mountains, 378, 386 hornblende tonalite, Cypress Bowl Jacksonville pluton, 178 Clipper Mountains pluton, 356 intrusion, 111 jasperoids, Barneys Canyon, 321 Cloudburst pluton, 105 hornblendite Jenkins Peak fault, 271 Cowhole Mountains, 335, 336 Hobson Lake pluton, 166 Jervis Inlet, 103, 104, 105, 107, 110, Cowhole Pluton, 336 Owens Mountain area, 207 111, 115, 117, 120 Cowhole volcanics, 338 Hornet Creek Gneiss, 99, 100 Jervis Island, 111 Griffith Creek volcanics, 90 Horse Creek section, 54 Joana Limestone, 296 Horseshoe Bay, 104 Horseshoe Bay, 104 John Muir Intrusive Suite, 32 Humboldt igneous complex, 242 hotspots, 2, 3, 224 Johnstone Strait, 96 Klamath Mountains, 182 House Range, 288, 407 Josephine ophiolite, 28, 29, 221, 232 Mojave Desert, 356, 382 Howe Sound, 95, 96, 104, 106, 107, Juan de Fuca plate, subduction of, 2 Mount Jasper, 104 111, 115 Judd Hollow Member, Carmel northeastern Great Basin, 270 Humboldt igneous complex, Nevada, Formation, 395, 397, 399, 409 Owens Mountain area, 205, 207, 229 Judd Hollow Tongue, Page Sandstone, 209, 210, 213, 218 geology, 234 410 Princess Royal Reach granodiorite, origin, 241 Judith Mountain, Montana, 17 117 paleogeography, 243 Juniper Basin, 305 Sechelt Peninsula, 104 petrology, 241 Ship Mountains pluton, 355 stratigraphy, 235 K southeast British Columbia, 141, Humboldt lopolith, 231, 234, 235 150, 152, 153 Hurley Formation, 99 Kaibab Formation, 296, 301, 303 White Horse Mountains, 277 Hurley River pluton, 120 Kaltag fault, 19 White Rock pluton, 178 hydrothermal metamorphism, Barneys Kamloops-Challis-Absaroka magmatic hornblende-biotite granodiorite Canyon, 314 belt, 17, 26 Clipper Mountains, 378 Kamloops-Challis-Absaroka volcanic Newfoundland Mountains, 270 I episode, 32 northeastern Great Basin, 285 Kanab, Utah, 394 northern Utah, 269 Idaho batholith, 17, 18, 22, 32 kaolinite Silver Island Mountains, 271 Idaho reentrant, 18 Barneys Canyon, 313, 319, 322, hornblende-biotite monzonite, Iditarod fault, 19 323 Ladybird Suite, 143 ignimbrite Laberge Group, 56 hornblende-biotite quartz diorite Cold Fish Volcanics, 85, 87 Oquirrh Mountains, 314, 316 Hurley River pluton, 120 Spatsizi River area, 85 Karmutsen Formation, 25, 101, 103 Mt. Rohr pluton. 120 illite Kaslo Group, 142, 162 hornblende-biotite quartz monzonite, Barneys Canyon, 313, 319, 323 Kayenta Formation, 334 Silver Island Mountains, 271 Carmel Formation, 402, 403, 405 Glen Canyon Group, 409 hornblende-biotite tonalite Oquirrh Mountains, 314 Keen Creek assemblage, Milford Sackinaw Lake body, 111 illite-smectite Group, 162, 163 White Rock pluton, 177 Barneys Canyon, 313 Keystone anticline, 296, 301, 305, hornblende diorite Oquirrh Mountains, 316 307 Goat Lake diorite, 107 Independence dike swarm, 12, 23, 204, Keystone fold, 308, 310 Owens Mountain area, 205 221, 222, 225, 327, 339, 371, Kilbeck Hills, 352, 353, 386 Pemberton Dioritic complex, 111 388 dike swarm, 351, 355 Silver Island Mountains, 271 Indian Ocean, formation of, 34 King Lear Formation, 234 Thornbrough intrusion, 104 Inklin Formation, 50 King Range terrane, California, 24, 28 Toba Inlet, 110 Insular Belt, 100, 126, 169 King Salmon fault, 80 West Redonda diorite, 111 eastern, 95, 101, 103, 106, 107 Kings River fault, 23

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Kings River ophiolite, 205 Lewes River Group, 49, 50, 52, 54, 56, magnetic anomalies, 34 Kingston Range, 345 71, 80 ocean-floor, 28 Kirkman-Diamond Creek Formation, Lewes River-Laberge Group, 50 magnetic bight, Aleutian Trench, 17 314, 316, 317 Lewes River limestone, 50 magnetite Klamath Mountains, 5, 23, 32, 33, Lewes River volcanic arc, 47, 48, 49, Aishihik Batholith, 67 173, 186, 221, 230, 232, 243, 50 Clipper Mountains pluton, 356 246, 250 Lexington porphyry, 165 Mojave Desert, 356 accretion, 253 light rare earth elements, Humboldt northeastern Great Basin, 270 amalgamation, 253 igneous complex, 229, 242 Pilot Range, 278 metamorphic terranes, 173 Ligurian Tethye, formation of, 33 Spatsizi River Stock, 85 plutonism, 224 Lillooet River tonalite/granodiorite, Malibu diorite, 103, 104 Klotassin Batholith, 66 115 Malispina Peninsula, 110 Klotassin Plutonic Suite, 66 Lillooet River Valley, 115 Malispina pluton, 110 batholiths, 47, 50, 57 limestone, 8 marble plutons, 50 Bridge River Group, 99 Aishihik Batholith, 71 Klukwan-Duke mafic/ultramafic belt, Carmel Formation, 399 Cariboo Mountains, 165 Alaska, 33 Cogburn Creek unit, 100 Coast Plutonic complex, 103 Knoll Mountain, Nevada, 284, 285 Humboldt igneous complex, 232, Laberge Conglomerate, 52 Kobuk fault, 19 234, 244 Milford Group, 162 Koipato Group, 235 Laberge Conglomerate, 51 Nisling Terrane, 71 Kootenay Arc, 143, 159, 160, 161, Lewes River Group, 52 Settler Schist, 100 166 Milford Group, 162 Silver Island Mountains, 271 Kootenay Lake, 143 Orocopia Schist, 30 Marble Mountains, 377, 387, 388 Kootenay Terrane, 142, 143, 159, Plympton Formation, 296 northern, 353 163, 165 Spatsizi River area, 85 Mariposa Formation, 24, 205 Kula/Farallon ridge, 17 Thaynes Formation, 296, 297, 303 Marlborough Heights, Jervis Inlet, Kula plate, 17, 26, 29, 34, 353 Tyaughton Group, 99 115 rate of motion of, 2 Whitehorse Trough, 50 Marlborough porphyry, 115 Kula ridge, 29 lineations, Aishihik Batholith, 75 Marshall Creek fault, 99 Kuskanax Batholith, 143, 149, 150, Little Cowhole Mountains, 328, 347 Marten Conglomerate, 142, 162 151, 152, 153, 163, 165 Little River batholith, 52 Maverick Springs Range, 308 Kuskanax intrusive suite, 143 Little Rocky Mountain, Montana, 17 May Creek amphibolite, 186 Kuskowim Mountains, 29 Logtown Ridge Formation, 205, 218 May Creek terrane, 174, 178, 186, 188 kyanite Long Lake Plutonic Suite, 71 McCoy Mountains, 389 Klamath Mountains, 185 Long Valley Caldera, 407 McCoy Mountains Formation, 389 Nisling Terrane, 71 lopolith, Aishihik Batholith, 79, 81 McHardy assemblage, Milford Group, Loray Formation, 296 142, 162 Los Angeles basin, 24 Meekoceras, 296, 297, 304, 305 L Lost Canyon fault, 271 melatroctolite, Humboldt igneous Laberge Group, Yukon Territory, 47, Lost Creek Stock, 143 complex, 229, 235, 236 50, 51, 55, 56 Luning-Fencemaker fold and thrust Melones fault zone, 198, 204, 205, Labrador Sea, 34 belt, 23 218, 222 Ladnet Group, 99 Melrose intrusion, 277, 295, 299, 305 Ladybird Granite, 151, 153 Luning-Fencemaker thrust fault, 246 Melrose stock, 296, 305, 307, 310 Ladybird leucocratic granitic suite, Mendocino fracture zone, Mexico, 15, 142, 143 M 24 lahar, Spatsizi River Stock, 85 Mercur mining district, Utah, 313 Laib Formation, 142, 149 Mackie Pluton, 143 mercury Lake Combie complex, 232 Magdelena plate, 31 Barneys Canyon, 319 Lake Laberge, 54 magmatic arc Oquirrh Mountains, 314 lanthanum, Mojave Desert, 354 Cowhole Mountains, 327 metadiorite, 8 Mojave Desert, 351 Laramide orogenic belt, 18 Humboldt igneous complex, 234 magmatic flow, Aishihik Batholith, Laramide orogeny, 5 metagreenstone, Klamath Mountains, " 65 Lardeau Formation, 142 175 magmatism, 1, 19, 26, 31, 32 Lardeau Group, 162 metaleucotonalite, Owens Mountain Cordilleran orogen, 229 Last Creek Formation, 99 area, 207 cycle of, 2 latite metapelites, Klamath Mountains, 182, Nevada Jurassic Magmatic Province, Humboldt igneous complex, 229. 183, 185 262 235, 241 metatonalite, Owens Mountain area, northeastern Great Basin, 267, 285, Keystone anticline, 301 207, 210 288 Leach Mountains, 284 Methow Basin, 24, 99, 125, 126, 127 northern Great Basin, 249, 250 lead, inheritance, 163, 168 Mexican cycle, 15, 18 silicic, 2, 9, 31 Leppy Range, 271 mica southern Coast Belt, 95, 115 leucocratic monzogranite, White Horse Aishihik Batholith, 67, 73 Stikinia, 93 Mountains, 277 Barneys Canyon, 324 magnesiohornblende, Owens Mountain leucogranodiorite, Sechelt pluton, Nisling Terrane, 71 area, 209 105 Owens Mountain area, 205 magnesium, northeastern Great Basin, Lewes River arc, 59 White Rock, 182 270

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micaschist, Aishihik Batholith. 67, Mt. Tallac roof pendant, 232 nickel, Mojave Desert, 354 70, 73, 78, 79 mudstone, 25 Nikolai Greenstone, 25 microcline. Pilot Range, 278 Carmel Formation, 399 niobium microdiorite Colorado Plateau, 407 Clipper Mountains pluton, 370 Aishihik Batholith, 67, 73, 78 Cow Creek, 175, 178, 188 Mojave Desert, 361 Cowhole Mountains, 329, 336 Humboldt igneous complex, 244 Nisling Assemblage, Nisling Terrane, microgahbro, Humboldt igneous Klamath Mountains, 173, 174, 71 complex, 229, 235, 241 175 Nisling Terrane, 47, 48, 50, 51, 52, microgranite, Melrose intrusion, 300 Laberge Conglomerate, 51 56, 59, 60, 65, 66, 67, 71, 78, Mid-Pacific Mountains, 2 Western Klamath terrane, 178 79, 80, 81, 91 mid-Proto-Caribbean ridge, 22 Whitehorse Conglomerate, 54 Nopah Formation, 378 migmatite, Aishihik Batholith, 65, 67 Whitehorse Trough, 50 norite, Owens Mountain area, 207 migmatization, Aishihik Batholith, 79 Muir-Chichagof belt, 33 North American plate, 13, 33, 34 Milford Group. 142, 149, 162, 166 Murray fracture zone, 15 North Cascades, Washington, 100 Milo, Oregon, 175 muscovite North Chilean Andes, 243 Mine Stock, 143 Aishihik Batholith, 67 North China block, 34 Mineral King pendant, 232 Cow Creek, 179 North Fork American River area, 232 Miners Spring Granite, 278, 280 Klamath Mountains, 183, 184 North Oquirrh thrust, 317 Mission fault, British Columbia, 24 Owens Mountain area, 205, 207, northeastern Great Basin, 296 Mission Ridge normal fault, 99 210 central province, 277 Misty Lake intrusion, 120 Pilot Range, 278 eastern province, 270 Moccasin Mountain, Montana, 17 Taono Range, 280, 281 extension, 287, 288, 291 Moenave Formation, 334 muscovite-biotite granite, Pilot magmatism, 285, 288 Glen Canyon Group, 409 Range, 278 metamorphism, 287 Mogollon highlands, 407 mylonite, Aishihik Batholith, 65, 71 shortening, 285, 288, 289, 291 Mojave Desert, California, 231, 234, mylonitization, 12, 15, 16, 24, 25, western province, 281 244, 327, 351, 375 31, 203 Northeastern Nevada structural eastern, geologic setting, 352 British Columbia, 23 province, 277 geochemistry, 357 Notch Peak quartz monzonite, 407 geochronology, 356 Nugget Sandstone, 297 N Mojave-Snow Lake Fault, 244, 347 Nutzotin-Chicagof belt, 33 Mojave-Sonora megashear, California, Nahlin fault, 80 23, 223 Nansen ridge, 34 O molasse Nasina Assemblage, Nisling Terrane, Canadian Cordillera, 18 71 obduction Hazelton Trough, 84 Navajo Sandstone, 333, 334, 401, Cache Creek Terrane, 92 molybdenum porphyry deposit, 18 405, 409 Coast Range ophiolite, 25 Monashee complex, 148 Nazca plate, 31 ophiolites, 14, 28 Monterey plate, 31 Nebo thrust, 316 Quesnellia, 153, 165 monzodiorite, Ship Mountains pluton, Nelson Batholith, 143, 149, 150, 151, ocean floor, formation of new, 34 355 152, 163 Ochre Mountain thrust fault, 277 monzogranite Nelson Creek body, Vancouver, 111 Okanagan Lake, 148 Humboldt igneous complex, 237 Nelson intrusive suite, 142, 143, 152, Okanagan Valley fault, 142 Melrose intrusion, 299 153 Old Dad Fault, 344, 345 Silver Island Mountains, 271 Nelson Island, 111 Old Dad Mountain, 328, 334, 344, monzonite Nelway Active Formation, 142 345, 347 Blind Hills, 378, 380, 382 Nemo Lakes belt, 142 Old Woman Mountains, 352, 353, Coryell Suite, 143 Netalzul volcanics, 93 354, 356, 357, 377, 378, 386, Humboldt igneous complex, 229, Nevada Jurassic Magmatic Province, 388 237, 242 249 dike swarm, 351, 355, 370 Melrose intrusion, 299 deformation, 260, 262 oligoclase southeast British Columbia, 150 paleogeography, 253 Aishihik Batholith, 67 monzonite-monzogranite, Humboldt plutons, 260 Owens Mountain area, 207, 209, igneous complex, 235 shortening, 249, 255, 260, 262 213 Morrison Formation. 33, 324. 405, tectonic development, 262 olivine 410 tectonic model, 259 Humboldt igneous complex, 235 Motaqua-Polochic fault zone, thermal models, 255, 262 Klamath Mountains, 182 Guatemala, 34 Nevada orogenesis, 219 southeast British Columbia, 148 Mount Brock volcanics, 83, 84, 87, Nevadan orogeny, 5, 191, 192, 193, olivine gabbro 91, 92 198, 199, 200, 203, 218, 219, Humboldt igneous complex, 229, Mount Clarke pluton, 111, 115 225, 315 235 Mt. Creedon volcanic complex, 72 Newark Canyon Formation, 252, 255, Owens Mountain area, 207 Mount Jasper, 104 285 Omineca Belt, 142 Mount Jasper pluton, 103, 104, 115 Newbury Volcanics, 347 Omineca Crystalline Belt, 148, 159, Mt. Jura area, 232 Newfoundland Mountains, 8, 255, 270, 161, 166 Mt. Katmai, Alaska, 3 280, 285, 287, 288, 307, 308 omphacite, Alps, 27 Mount Mason pluton, 115 Newfoundland Stock, 308 ophiolite, 28 Mt. Rohr pluton, 120 Newman Creek body, Vancouver, 111 defined, 14

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ophiolite (continued) pegmatite plagioclase (continued) Klamath Mountains, 174 Aishihik Batholith, 67, 75 Mojave Desert, 356 obduction of, 14, 28 Clipper Mountains, 387 northeastern Great Basin, 270 Shulaps complex, 99 Melrose intrusion, 300 Owens Mountain area, 205, 207, Slide Mountain Terrane, 80 pelite, Settler Schist, 100 209, 211, 212, 215, 218, 219, Venezuela, 22 Pelona Schist, 8, 30 220 Ophir anticline, 316 Pemberton, British Columbia, 96 Pilot Range, 278 Oquirrh basin, 189 Pemberton belt, 100 Ship Mountains pluton, 355 Oquirrh Formation, 324 Pemberton Dioritic complex, 107, southeast British Columbia, 152, Oquirrh Mountains, 274, 285, 288, 111, 117, 120 153 313 Peninsula Formation, 104 White Rock, 182 tectonism, 313 Peninsular Ranges batholith, 32 plate margin, delamination of, 1 Oquirrh plate, 316 Peninsular terrane, 125 plate motion Oquirrh thrust, 316 Penon Blanco Formation, 205, 218 evidence for, 12 Ord Mountain, 347 Pequop Formation, 296, 305 relative, 2 Orleans fault, California, 174 Pequop Mountains, 290, 295, 296, plates, anchoring of, 27 Orocopia Schist, 8, 30 307, 308, 310 Playground Thrust, 328 orthoclase, Cowhole Pluton, 336 peraluminous granite, Shore Line plutonism orthogneiss Stock, 151 cause of, 259 Cariboo Mountains, 165 peridotite Mojave Desert, 351 Clipper Mountains, 377 Klamath Mountains, 186 northern Great Basin, 249, 250, 259 Hornet Creek Gneiss, 100 Orocopia Schist, 30 silicic, 9 orthopyroxene serpentinized, 8 White Horse Mountains, 277 Klamath Mountains, 182 southeast British Columbia, 145, See also plutons Owens Mountain area, 207 148 plutons southeast British Columbia, 148 perthite Nevada Jurassic Magmatic Province, orthoquartzite, Humboldt igneous Griffith Creek volcanics, 90 260 complex, 231 Mojave Desert, 356 Owens Mountain area, 224 Ouachita orogeny, 254 phosphorus See also plutonism Owens Mountain area, 203, 204, 205 Clipper Mountains pluton, 370 Plympton Formation, 296, 301, 304, dike swarm, 203, 204, 219, 220, Mojave Desert, 361 305 225 phyllite polar wander. See apparent polar geochronology, 215 Bridge River Group, 99 wander; true polar wander metamorphism, 213 Klamath Mountains, 175, 182 Polaris Alaskan ultramafic complex, mineral composition, 207 Milford Group, 162 168 structures, 209 Owens Mountain area, 205 Pony peak pluton, 178 Owens Mountain-Santa Cruz Mountain Pilot Range, 278 Pony Trail Group, 252 dike swarm, 221, 222, 225 phyllite/schist, Kootenay arc, 162 Porphyry Knob quartz monzonite, 314 Owens Mountain shear zone, 212, 225 Pilot Range, 267, 268, 269, 278, 285, porphyry copper deposit, 3, 8, 12, 15, oxides, Owens Mountain area, 207 286, 307, 308 18, 23, 25, 31 oxyhornblende, Cowhole Mountains, Pine Nut fault system, 23, 223 British Columbia, 5 333 Pine Nut Range, 234 northern Mexico, 5 arc volcanism, 234 southern Arizona, 5 Pinnacle dome, 142 Portal Ridge Schist, 30 P Pinon Range, 255, 284, 285, 289 potassium Pacific hotspot, 2 Pioneer batholith, Montana, 32 Mojave Desert, 354 Pacific Ocean, northeastern, 14 Pioneer Formation, 99 Owens Mountain area, 220 Pacific plate, 15, 24, 29, 33 Pioneer fracture zone, 15 potassium feldspar northward motion of, 13, 14 Pitt Lake, 105, 115 Aishihik Batholith, 67, 73, 78 rate of motion of, 2 Pitt Lake pluton, 104, 105 Emigrant Gap composite pluton, Page, Arizona, 394, 399, 407 Piute Mountains, 352, 353, 377, 386, 194 Page Sandstone, Colorado Plateau, 393 388 Humboldt igneous complex, 237 sedimentology, 395 dike swarm, 351, 355 northeastern Great Basin, 270 stratigraphy, 395 plagioclase Owens Mountain area, 220 paleocurrents Aishihik Batholith, 65, 67, 73, 78 southeast British Columbia, 143 Horse Creek section, 54 Clipper Mountains pluton, 356 Povoas Formation, 49, 52 Whitehorse Trough, 59 Coast Plutonic complex, 101 Powell Creek volcanics, 99 paleoflow. Horse Creek section, 54 Cow Creek, 175 Powerline Canyon Zone, 347 Palisade Crest Intrusive Suite, 6 Cowhole Mountains. 333, 335, 336 Preston Peak area, 221 paragneiss, Clipper Mountains, 377 Cowhole Pluton, 336 Preston Peak dike swarm, 204, 222, paragonite, Oquirrh Mountains, 316 Cowhole volcanics, 338 225 Paria, Utah, 407, 409 Griffith Creek volcanics, 90 Preston Peak fault, California, 174 Paria Amphitheater, 395, 399, 400, Humboldt igneous complex, 235, Prince of Wales fault, 120 407, 409 236, 239 Princess Louisa granodiorite, 107 Paria River Member, Carmel Klamath Mountains, 177, 182, 183, Princess Louisa Inlet, 110 Formation, 400 184 Princess Louisa pluton, 107 Park City Formation, 314, 317 Laberge Group, 56 Princess Royal Reach granodiorite, Pasayten fault, 96, 125 Lewes River arc, 49 117, 120

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Princess Royal Reach pluton, 111 quartz monzonite (continued) Richthofen Formation, Laberge Group, Prospect Mountain Quartzite, 271 Coast Plutonic complex, 101 50 Prospect Zone, 347 Cowhole Pluton, 336 rifting, 1, 31 Proto-Caribbean ridge, 33 Goldhammer pluton, 385 Basin and Range province, 27 Proto-Caribbean Ocean, 22 Hobson Lake pluton, 166 ring of fire, 4 Providence Mountains, 353, 377, 387, Humboldt igneous complex, 234, Rio Grande rift, 15 388 237 Riondel nappe, 166 Purcell Anticlinorium, 142, 143 Ship Mountains pluton, 355 Ritter Range pendant, 232 pyrite, Oquirrh Mountains, 314 Windermere Supergroup, 166 Rivera plate, 31 pyrophyllite, Aishihik Batholith, 67 Yukon, 52 Roberts Mountains thrust fault, 253 pyroxene quartz porphyry, Humboldt igneous Rockall Trough, 5 Cow Creek, 175 complex, 234 Rocky Mountain-East Humboldt Cowhole Mountains, 333, 336 quartz siltite, Laberge Conglomerate, Range, 6 southeast British Columbia, 152 52 Rocky Mountain foreland fold and quartz syenite, Melrose intrusion, 300 thrust belt, 160 quartzite Rocky Mountain Trench, 165 Q Aishihik Batholith, 71 northern, 12 Qinling fold belt, 34 Cowhole Mountains, 336 Rodman Mountain, 347 Quarry Bay intrusion, 107, 111 Laberge Conglomerate, 52 Rogers Canyon Sequence, 317 quartz Nisling Terrane, 70, 71 Rogue Formation, 174 Aishihik Batholith, 67, 73, 78 Pilot Range, 278 Romana Sandstone, 410 Alaska, 27 Settler Schist, 100 Ross Lake fault, Washington, 12, 26 Barneys Canyon, 313, 319, 322 quartzose, Nisling Terrane, 71 Rossland Group, 142, 148, 162, 163, Clipper Mountains pluton, 356 quartzose sandstone, Humboldt igneous 165 Cowhole Mountains, 335, 336 complex, 234 southeast British Columbia, 142 Cowhole Pluton, 336 Quatam pluton, 107, 110 Rouge Valley subterrane, Western Cowhole volcanics, 338 Quatsino Formation, 103 Klamath terrane, 174, 178 Griffith Creek volcanics, 90 Quechan Volcanics, 30 Ruby batholith, 28 Humboldt igneous complex, 236 Queen Charlotte Islands, 103, 169 formation of, 22 Klamath Mountains, 183, 184 Quesnel Lake gneiss, 168 Ruby Mountains, 255, 267, 281, 285, Mojave Desert, 356, 382 Quesnel Terrane, 67, 80, 81 287, 289, 389 northeastern Great Basin, 270 Quesnellia, 99, 125, 142, 143, 152, Ruby Range Batholith, 72 Oquirrh Mountains, 316 159, 168 Rutland Road body, Vancouver, 111 Owens Mountain area, 205, 207, obduction, 153, 165, 168 Ryan River, 105 209, 210, 211, 212, 213, 218, See also Intermontane Superterrane 220 Quesnellia volcanic arc, 159 S Pilot Range, 278 Quicksilver conglomerate, 99 White Rock, 182 Sackinaw Lake pluton, 103, 107, 111 quartz arenite Sailor Canyon Formation, 6, 191, R Boyer Ranch Formation, 246 192, 193 Humboldt igneous complex, 235, Raft River, 281 fossils, 197, 199 244 Rand Schist, 8, 30 Sierra Nevada, 23 quartz diorite Rand thrust, 30 Salmo Stock, 143 Aishihik Batholith, 67 rare earth elements Salmon Arm, 111 Clipper Mountains, 387 Humboldt igneous complex, 229, Salt Spring Formation, 205, 219 Cloudburst pluton, 105 242 fossils, 205 East Sechelt quartz diorite, 111 Mojave Desert, 359 Salt Spring slate, 218 Hobson Lake pluton, 166 Rattlesnake Creek terrane, 32, 174, San Andreas fault system, 2, 17, 29 Horseshoe Bay, 104 178, 221, 232 San Bernardino Mountains, 244 Humboldt igneous complex, 229 recrystallization, 182, 188 San Gabriel Mountains, 353 Marlborough porphyry, 115 Owens Mountain area, 211 San Gregorio fault, 17 Pemberton Dioritic complex, 11 1 Red Ant schist, 199 San Joaquin River fault, 23 Sechelt Peninsula, 104 red beds, Tyaughton Group, 99 San Juan Islands, Washington, 127 Spetch Creek pluton, 117 Red Mountain, 177, 188 San Juan Mountains, Colorado, 15 Valhalla Complex, 143 Relay Mountain Group, 99 San Pedro volcanics, 243 quartz latite Resolution seamount, 2 Sand Hills, 328, 334 Humboldt igneous complex, 235 rhyodacite, Keystone anticline, 301 sandstone Melrose intrusion, 300 rhyolite Aztec Sandstone, 332 quartz mica schists, Klamath Cold Fish Volcanics, 85, 87, 93 Chinle Formation, 297 Mountains, 174 Colorado Plateau, 409 Cowhole Mountains, 327, 336 quartz monzodiorite Cortez Mountains, 284 Franciscan Complex, 30 Aishihik Batholith, 67. 80 Cow Creek volcanic arc. 188 Humboldt igneous complex, 235 Clipper Mountains, 356, 378 Cowhole Mountains, 336 Laberge Conglomerate, 51 Clipper Mountains pluton, 356 Humboldt igneous complex, 234 Laberge Group, 56 Melrose intrusion, 299 Melrose intrusion, 300 Lewes River Group, 52, 55 Milford Group, 162 Sumas Mountain, 104 Pinon Range, 284 Mt. Katmai, 3 quartz monzonite rhyolitic ignimbrite, Cowhole Orocopia Schist, 30 Aishihik Batholith, 67, 71, 73 Mountains, 335, 336

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sandstone (continued) shortening (continued) Slide Mountain Terrane, 80, 142, 143, Plympton Formation, 296 crustal, 23 159, 162, 163, 165, 168 Sailor Creek Formation, 23 foreland fold and thrust belt, 8 Slocan Group, 142, 162 Thaynes Formation, 303 Nevada Jurassic Magmatic Province, Slocan Lake, 143 Whitehorse Conglomerate, 54 249, 255, 260, 262 Slollicum schist, 100 Whitehorse Trough, 50 northeastern Great Basin, 267, 268, Smartville belt, 191, 192, 197, 198, Sandwash Member, Morrison 277, 285, 288, 289, 291 200 Formation, 324 northern Great Basin, 259 Smartville complex, 220 sanidine Pilot Range, 280 Smartville dike swarm, 204, 222, 225 Cowhole Mountains, 335, 336 White Horse Mountains, 277 Smartville Slate Creek complex, 232 Cowhole volcanics, 338 shoshonitic rocks, 23 smectite Santa Barbara, California, 407 Shuksan Metamorphic Suite, 24 Carmel Formation, 402, 403, 405 Santa Cruz Mountain-Guadalupe Shulaps ultramafic/mafic complex, 96 Laberge Group, 56 igneous complex area, 219 Shuyak Formation, 12 Snake Range area, 255, 287, 288, 289, Santa Cruz Mountain-Hornitos Sierra Madre Occidental, 2, 9, 11, 15 290, 308 plutons, 219 Sierra Madre Occidental batholith, Snake River Plain, 18 Santa Cruz Mountain pluton, 219 Mexico, 17, 24, 27, 28 Snow Lake block, 244 Santa Cruz Ocean Floor, 15, 17, 28 Sierra Nevada, California, 1, 5, 9, 11, Snow Lake pendant, 244 saussurite, Cowhole Mountains, 336 12, 15, 19, 23, 24, 26, 27, 33, Soda Lake playa, Mojave Desert, 327, scapolite, Humboldt igneous complex, 174, 191, 230, 244, 250, 347 328, 340 242 accretion, 253 Soda Mountain Formation, 347 schist, 8, 18 amalgamation, 253 Soda Mountains, 328, 347 Bridge River Group, 99 northern, 191 sodium, Humboldt igneous complex, Clipper Mountains, 377 plutonism, 219 242 Elk Creek, 179 Sierra Nevada batholith, 23, 28, 192, Soldier Pass Intrusive Suite, 6 exhumation of, 29 230, 231, 232, 244 Sonoma orogeny, 8, 253, 254 Klamath Mountains, 173, 175 formation of, 26, 28 Sonoma Range, 254 Pacific Northwest, 24 plutons, 220 Sonora dike swarm, 204, 221, 222, Wildcat Ridge, 177 Sierra Nevada Foothills, 232, 246 225 Scuzzy-Mt. Rohr Suite, 100, 120 Sierra Nevada Foothills terrane, Sonoran Desert region, 231, 244 Scuzzy pluton, 115, 120 California, 203 South Anyuy suture, 19 sea-floor spreading, 28 Sierra Nevada metamorphic belt, 6, South Atlantic Ocean, 22 Sechelt Peninsula, 104, 111 232 South China block, 34 Sechelt pluton, 103, 105, 111 Sierra Santa Lucia Arc, Baja California, South Fork Mountain Schist, Seiad Valley area, 221 16, 24 California, 30 sericite Sierran arc, 223 South Umpqua River, 175 Aishihik Batholith, 67 Sierran plutonism, 224 South Umpqua River drainage, 174 Clipper Mountains pluton, 356 silica, Oquirrh Mountains, 314 Spatsizi River area, 80, 83, 84, 87, 90, Pilot Range, 278 sillimanite 92 serpentine, Klamath Mountains, 177 Emigrant Gap composite pluton, stratigraphy, 85 serpentinite 194 Spatsizi River fault, 87 Cogburn Creek unit, 100 Klamath Mountains, 173, 175, 177, Spatsizi River Stock, 85, 90, 91 Klamath Mountains, 186 182, 183, 184, 185, 186 age determinations, 89 serpentinite mélange, Shulaps Nisling Terrane, 71 geochronology, 91 complex, 99 Pilot Range, 278 Spectre Spur, Soda Mountains, 347 serpentinization, 25, 31 siltstone Spetch Creek, 117 Settler-Chism Creek schist, 120 Aztec Sandstone, 332 Spetch Creek pluton, 111, 115, 117, Settler Schist, 99, 100 Boston Bar Formation, 99 120, 127 Sevier fold and thrust belt, Utah, 295 Humboldt igneous complex, 232, sphene Sevier orogenic belt, 5 234, 244 Clipper Mountains pluton, 356, Sevier orogeny, 5, 314, 315 Sailor Creek Formation, 23 370 Sexton Mountain area, 178, 188 Thaynes Formation, 297 Mojave Desert, 356 Shadow Valley, 345 Silver Island, 271 northeastern Great Basin, 270 shale Silver Island Mountains, 268, 271, Owens Mountain area, 207, 220 Boston Bar Formation, 99 285, 287, 288 Pilot Range, 278 Laberge Conglomerate, 51 Silver Lake Formation, 388 sphene-hornblende-biotite Lewes River Group, 52 Silver Zone Pass, 308 granodiorite, northeastern Great Thaynes Formation, 296, 297, 303 Silver Zone Pass pluton, 280, 281 Basin, 270 Whitehorse Conglomerate, 54 Skagit Complex, 26 spinel, southeast British Columbia, Whitehorse Trough, 50 Skagway-Ketchikan-Prince Rupert 148 Shatsky rise, 2 belt, 17, 26, 27, 33 Spring Canyon, 305 Ship Mountains, 352, 354, 357, 387 Skeena Fold Belt, British Columbia, Spuzzum intrusion, 107 Ship Mountains pluton, 351, 353, 18 Spuzzum pluton, 99, 100, 111, 115, 355, 357, 359, 362, 369, 370 Slate Creek thrust, 199 127 Shoo Fly Complex, 192 slate Squamish granodiorite, 105, 106 Shore Line Stock, 143, 151, 153 Klamath Mountains, 182 Squamish pluton, 104, 111 shortening, 5, 8, 159, 162, 168, 169, Pilot Range, 278 Stansbury Mountains, 316 188 Sexton Mountain area, 178 Star Peak Group, 235

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Star Peak strata, 235 tectonic events Toodoggone River area, 92 staurolite evidence for, 23 Tosco-Abreojos fault, Baja California, Klamath Mountains, 173, 175, 177, major chaotic, 31 17, 24 182, 183, 184, 185, 186 tectonic fragmentation, 24 tourmaline, Pilot Range, 278 Nisling Terrane, 71 tectonics Trail Pluton, 143, 150, 151, 152 Pilot Range, 278 northeastern Nevada, 267 Trans-Idaho discontinuity, 23 Taono Range, 280 northwestern Utah, 267 Trans-Pecos area, Texas, 15 staurolite-garnet schist, Taono Range, Oquirrh Mountains, 314 Transverse Ranges, 24, 29, 224 281 tectonism tremolite Stave Glacier intrusion, 117 cycle of, 2 Klamath Mountains, 177, 182 Stave Lake, 104, 115 extensional, Hazelton Trough, 83 Pilot Range, 278 Stikine assemblage, 91 Mojave Desert, 376 Taono Range, 280, 281 Stikine Terrane, 47, 48, 55, 56, 67, tectonite, 50 trondhjemite, White Rock pluton, 177, 71, 81, 83, 160. See also Stikinia Telegraph Creek map area, 80 178 Stikinia, 5, 65, 91, 93, 169. See also Temple Cap Sandstone, 409 true polar wander, 1, 28, 31 Stikine Terrane terraces, rotation of, 1 Tuolumne Intrusive Suite, 32 Stillwater Range, Nevada, 232, 234, terranes Tuolumne River area, 232 235, 246 amalgamation of, 48 Tuolumne River ultramafic complex, Straight Creek fault, 12 creation of, 17, 28 232 Strait of Georgia, 96, 100 rotation of, 31 turbidites, Hurley Formation, 99 Strawberry thrust, 316 tectonic, 48 Tuttle Lake Formation, 191, 192, 193, Stubbs thrust, 161, 162, 163, 165 tectonostratigraphic, 1 197, 199 Stuhini Group, 49, 80, 84, 85, 87, 90, Tetrahedron Peak, 111 Twin Creek Limestone, Utah, 399 91 Texada Island, 101, 103, 107, 125 Twin Island Schist, 100, 101 subduction, 21, 23, 31, 32 Teztlaff Peak fault, 271, 274 Tyaughton basin, 96, 99, 125, 126, Hazelton Trough, 84 thallium 127 initiation of, 29 Barneys Canyon, 319 northern Mexico, 3 Oquirrh Mountains, 314 Tyaughton Group, 99 Oregon, 3 Thaynes fault, 303, 304, 305, 307 rapid, 8, 15, 27, 30, 31 Thaynes Formation, 296, 303, 305, southern California, 3 307 U subduction cycles, 1, 18, 29 thermal subsidence, Hazelton Trough, Uinta arch, 316 evidence for, 15 92 Uinta re-entrant, 316 subduction zones, 29 thickening, northeastern Great Basin, uplift, defined, 2 formation of, 1 267 V Sultan Limestone, 329, 378 tholeiites, island-arc, Pioneer Sumas Mountain, 104 Formation, 99 Valentine Spring Formation, Sumatra, 12 Thomas Lake shear zone, 100, 115, California, 30 Summerville Formation, 410 117 Valhalla Complex, 142, 143 Summit Stock, 143, 151, 153 Thor-Odin complex, 142 Vampire Formation, 388 Sunda-Banda volcanic arc, 243 Thornbrough intrusion, 103, 104 Vancouver, British Columbia, 96 Susalatna fault, 19 Thousand Pockets Member Vancouver Island, eastern, 107 syenite Page Sandstone, 395, 399 Vancouver plate, 31 Coryell Suite, 143 Paria Amphitheater, 401 subduction of, 2 Stikinia, 93 thrusting, times of, 5 Vaseaux Formation, 148, 149 Tiller, Oregon, 175 Victoria anticline, 301, 307, 308 Tintina Trench, 12 Victorville area, Mojave Desert, 353 T titanite, Aishihik Batholith, 67, 79 Vincent thrust, 30 Takla-Nicola-Rossland volcanic arc, titanium volcanic arcs, complex, Humboldt 159, 162, 163 Clipper Mountains pluton, 370 igneous complex, 246 Takwahoni Formation, 50 Mojave Desert, 361 volcanic flows, Garibaldi belt, 100 talc, Klamath Mountains, 182 Toano Range, 308 volcanic rocks, Milford Group, 162 talc serpentine schist, Klamath Toba Inlet, 103, 107, 110, 115 volcanic systems, silicic, 15 Mountains, 174 Toba River, 120 volcanic-arc activity, 1 talc-termolite-olivine, Klamath Toiyabe Range, 254 volcanics, Gambier Assemblage, Mountains, 177 tonalite, 203 104 Telkeetna Mountains, Alaska, 12 East Sechelt quartz diorite, 111 volcanism, 15, 19, 34 Talkeetna Mountains-Aleutian Range Horseshoe Bay, 104 Aleutian, 29 plutonio belt. 33 Humboldt igneous complex, 237 alkalic, 15, 17 Tally Ho shear zone, 50, 59 Mount Jasper, 104 andesitic, 1, 31 tantalum Mount Jasper pluton, 104 andesitic arc, 3, 4, 12, 29 Clipper Mountains pluton, 370 Owens Mountain area, 209, 211, basaltic, 1, 2, 27, 31 Mojave Desert, 361 215, 217, 218, 220, 225 calc-alkalic, 1 Taono Range, 280, 289 Ryan River, 105 episodic, 83, 91 Taylor Creek Group, 99 Sechelt pluton, 105 Hazelton Trough, 83, 84 Taylorsville sequence, 193 tonalite-granodiorite, Humboldt Humboldt igneous complex, 244 tectonic development, Nevada Jurassic igneous complex, 229, 235, 241 Pacific Northwest, 24 Magmatic Province, 262 Toodoggone formation, 92 silicic, 1, 9

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volcanism (continued) Western Metamorphic belt mélange, X Spatsizi River map area, 91 205 xenoliths, Aishihik Batholith, 65 volcano-plutonic arc, Laberge Group, White Horse Mountain, 274 59 White Horse pluton, 277 White Rock, 182 Y White Rock pluton, 173, 177, 178, volcanoes, andesitic, 3, 4 Yakutat terrane, 28 183, 185, 186, 188 Yalakom fault, 12, 96, 99 Whitehorse Mountain, 308 Yerington district, Nevada, 234, 250 W Whitehorse Trough, 50 Ymir Group, 142 Waddington Channel, 111 geochronometry, 52 ytterbium, Mojave Desert, 354 Walker Lane belt, Nevada, 23 Whitehorse Trough Conglomerate, yttrium, Mojave Desert, 354 Wall Stock, 143 47 Yukon-Koyukuk Basin, 28 Waneta thrust, 143 Whitewater thrust, 162 Yukon-Tanana Terrane, 48, 50, 56, 60, Wasatch Front, 315 Whytecliff granodiorite, 104 65, 66, 67, 80, 81 Wasatch Mountains, 316 Wildcat Ridge, 173, 174, 177, 178, Wasatch Range, 316 179, 183, 185, 186, 188 Washington, subduction, 3 Wildcat Ridge protolith, 186 Z Wells Gray Provincial Park, 166 Willison pluton, British Columbia, Zippa Mountain syenite complex, Wendover, Nevada, 296 52 Stikinia, 91 West Humboldt Range, 234, 235 Willow Creek thrust fault, 254, 255 zircon West Kettle River, 141 Windermere Supergroup, 161, 166 Aishihik Batholith, 67 West Kettle River lavas, 145 Winnemucca deformation, 8 Cariboo Mountains, 167 West Redonda diorite, 111 Winnemucca deformation belt, 253, Clipper Mountains pluton, 356, 370 West Redonda Island, 111 254, 255 West Traverse Range, 316 inheritance, 91, 93, 95, 101, 106, Wood Hills, 255, 281, 289, 307 218 Western Hayfork terrane, 232 Wrangellia, 95, 101, 125. See also Mojave Desert, 356 Western Klamath terrane, 174, 186, Insular Superterrane Ship Mountains pluton, 355 188 Wrangellia terrane, 125 southern Coast Belt, 101 Western Metamorphic belt, Sierra Wrangellian strata, 107 Nevada, 204 zirconium, Mojave Desert, 354

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Contents Preface v 1. Subduction Cycles Under Western North America During the Mesozoic and Cenozoic Eras 1 P. L. Ward 2. Provenance Constraints for Whitehorse Trough Conglomerate 47 C. J. R. Hart, J. R. Dickie, D. K. Ghosh, and R. L. Armstrong 3. Magmatic Flow and Emplacement Foliations in the Early Jurassic Aishihik Batholith, Southwest Yukon 65 S. T. Johnston and P. Erdmer 4. Age and Tectonic Setting of Early Jurassic Episodic Volcanism Along the Northeastern Margin of the Hazelton Trough, Northern British Columbia 83 D. J. Thorkelson, J. K. Mortensen, H. Marsden, and R. P. Taylor 5. Jurassic and Cretaceous Geochronology of the Southern Coast Belt, British Columbia, 49° to 51° N 95 R. M. Friedman and R. L. Armstrong 6. Nd-Sr Isotope Geochemistry and Pedogenesis of Jurassic Granitoid Intrusives, Southeast British Columbia, Canada 141 D. K. Ghosh and R. St J. Lambert 7. New Geochronological Constraints on Jurassic Deformation of the Western Edge of North America, Southeastern Canadian Cordillera 159 D. C. Murphy, P. van der Heyden, R. R. Parrish, D. W. Klepacki, W. McMillan, L. C. Struik, and J. Gabites 8. Metamorphism in the Northern Klamath Mountains, Oregon 173 M. A. Kays 9. Timing of Emplacement of the Haypress Creek and Emigrant Gap Plutons 191 G. H. Girty, R. E. Hanson, M. S. Girty, R. A. Schweickert, D. S. Harwood, A. S. Yoshinobu, K. A. Bryan, J. E. Skinner, and C. A. Hill 10. Late Jurassic Dike Swarms in the Southwestern Sierra Nevada Foothills Terrane, California 203 M. B. Wolf and J. B. Saleeby 11. Geology of the Humboldt Igneous Complex, Nevada, and Tectonic Implications for the Jurassic Magmatism in the Cordilleran Orogen 229 Y. Dilek and E. M. Moores 12. Causes and Consequences of Jurassic Magmatism in the Northern Great Basin 249 M. W. Elison 13. Jurassic Tectonics of Northeastern Nevada and Northwestern Utah from the Perspective of Barometric Studies 267 D. M. Miller and T. D. Hoisch 14. Mesozoic Structures of the Dolly Varden Mountains and Currie Hills, Elko County, Nevada 295 J. A. Zamudio and W. W. Atkinson, Jr. 15. Evidence of Jurassic Tectonism from the Barneys Canyon Gold Deposit, Oquirrh Mountains, Utah 313 R. Presnell and W. T. Parry 16. Structural and Stratigraphic Development of the Middle Jurassic Magmatic Arc in the Cowhole Mountains, Central-Eastern Mojave Desert, California 327 W. B. Wadsworth, H. Ferriz, and D. D. Rhodes 17. Plutonism at the Interior Margin of the Jurassic Magmatic Arc, Mojave Desert, California 351 M. E. Gerber, C. F. Miller, and J. L. Wooden 18. Jurassic Thrusting of Precambrian Basement over Paleozoic Cover in the Clipper Mountains, Southeastern California 375 K. A. Howard, K. J. W. McCaffrey, J. L. Wooden, D. A. Foster, and S. E. Shaw 19. Middle Jurassic Magmatism: The Volcanic Record in the Eolian Page Sandstone and Related Carmel Formation, Colorado Plateau 393 R. C. Blakey and R. A. Parnell, Jr. Index 413

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