Christopher J. Potter Robert P. Dickerson Donald S. Sweetkind Ronald M. Drake II Emily M. Taylor Christopher J. Fridrich Carma A. San Juan Warren C. Day 2002 1.0 map U.S. Geological Survey Geologic Investigations Series I-2755 Denver, Colorado U.S. Geological Survey http://pubs.usgs.gov/imap/2002/i-2755/ Yucca Mountain, Nye County, Nevada, has been identified as a potential site for underground storage of high-level radioactive waste. This geologic map compilation, including all of Yucca Mountain and Crater Flat, most of the Calico Hills, western Jackass Flats, Little Skull Mountain, the Striped Hills, the Skeleton Hills, and the northeastern Amargosa Desert, portrays the geologic framework for a saturated-zone hydrologic flow model of the Yucca Mountain site. Key geologic features shown on the geologic map and accompanying cross sections include: (1) exposures of Proterozoic through Devonian strata inferred to have been deformed by regional thrust faulting and folding, in the Skeleton Hills, Striped Hills, and Amargosa Desert near Big Dune; (2) folded and thrust-faulted Devonian and Mississippian strata, unconformably overlain by Miocene tuffs and lavas and cut by complex Neogene fault patterns, in the Calico Hills; (3) the Claim Canyon caldera, a segment of which is exposed north of Yucca Mountain and Crater Flat; (4) thick densely welded to nonwelded ash-flow sheets of the Miocene southwest Nevada volcanic field exposed in normal-fault-bounded blocks at Yucca Mountain; (5) upper Tertiary and Quaternary basaltic cinder cones and lava flows in Crater Flat and at southernmost Yucca Mountain; and (6) broad basins covered by Quaternary and upper Tertiary surficial deposits in Jackass Flats, Crater Flat, and the northeastern Amargosa Desert, beneath which Neogene normal and strike-slip faults are inferred to be present on the basis of geophysical data and geologic map patterns. A regional thrust belt of late Paleozoic or Mesozoic age affected all pre-Tertiary rocks in the region; main thrust faults, not exposed in the map area, are interpreted to underlie the map area in an arcuate pattern, striking north, northeast, and east. The predominant vergence of thrust faults exposed elsewhere in the region, including the Belted Range and Specter Range thrusts, was to the east, southeast, and south. The vertical to overturned strata of the Striped Hills are hypothesized to result from successive stacking of three south- vergent thrust ramps, the lowest of which is the Specter Range thrust. The CP thrust is interpreted as a north-vergent backthrust that may have been roughly contemporaneous with the Belted Range and Specter Range thrusts. The southwest Nevada volcanic field consists predominantly of a series of silicic tuffs and lava flows ranging in age from 15 to 8 Ma. The map area is in the southwestern quadrant of the southwest Nevada volcanic field, just south of the Timber Mountain caldera complex. The Claim Canyon caldera, exposed in the northern part of the map area, contains thick deposits of the 12.7-Ma Tiva Canyon Tuff, along with widespread megabreccia deposits of similar age, and subordinate thick exposures of other 12.8- to 12.7-Ma Paintbrush Group rocks. An irregular, blocky fault array, which affects parts of the caldera and much of the nearby area, includes several large-displacement, steeply dipping faults that strike radially to the caldera and bound south-dipping blocks of volcanic rock. South and southeast of the Claim Canyon caldera, in the area that includes Yucca Mountain, the Neogene fault pattern is dominated by closely spaced, north-northwest- to north- northeast-striking normal faults that lie within a north- trending graben. This 20- to 25-km-wide graben includes Crater Flat, Yucca Mountain, and Fortymile Wash, and is bounded on the east by the "gravity fault" and on the west by the Bare Mountain fault. Both of these faults separate Proterozoic and Paleozoic sedimentary rocks in their footwalls from Miocene volcanic rocks in their hanging walls. Stratigraphic and structural relations at Yucca Mountain demonstrate that block-bounding faults were active before and during eruption of the 12.8- to 12.7-Ma Paintbrush Group, and significant motion on these faults continued until after the 11.6-Ma Rainier Mesa Tuff was deposited. North of Crater Flat, in and near the Claim Canyon caldera, most of the tilting of the volcanic section predated the 11.6-Ma Rainier Mesa Tuff. In contrast, geologic relations in central and southern Yucca Mountain indicate that much of the stratal tilting there occurred after 11.6 Ma, probably synchronous with the main pulse of vertical-axis rotation that occurred between 11.6 and 11.45 Ma. Beneath the broad basins, such as Crater Flat, Jackass Flats, and the Amargosa Desert, faults are inferred from geophysical data. Geologic and geophysical data imply the presence of the large-offset, east-west-striking Highway 95 fault beneath surficial deposits along the northeast margin of the Amargosa Desert, directly south of Yucca Mountain and Crater Flat. The Highway 95 fault is interpreted to be downthrown to the north, with a component of dextral displacement. It juxtaposes a block of Paleozoic carbonate rock overlain by a minimal thickness of Tertiary rocks (to the south) against the Miocene volcanic section of Yucca Mountain (to the north). Alluvial geomorphic surfaces compose the bulk of Quaternary surficial units in the Yucca Mountain region. Deposits associated with these surfaces include alluvium, colluvium, and minor eolian and debris-flow sediments. Photogeologic and field studies locally have identified subtle fault scarps that offset these surfaces, and other evidence of Quaternary fault activity. This geologic map was constructed to provide the structural and stratigraphic framework for a saturated-zone groundwater model for the Yucca Mountain Project site area. Topographic base from these U.S. Geological Survey 1:24,000- scale digital line graph (DLG) quadrangles: East of Beatty Mountain, Topopah Spring NW, Topopah Spring, Jackass Flats, Striped Hills, Crater Flat, Busted Butte, Big Dune, Amargosa Valley, South of Amargosa Valley, Ashton, Beatty Mountain, Carrara Canyon, Lees Camp, Leeland, Skeleton Hills. 50,000-ft grid based on Nevada State Plane coordinates. Contour interval is 40 ft. DLG's were clipped to fit into the area of interest. Township and Range boundaries from U.S. Geological Survey 1: 100,000-scale Digital Line Graph data for the Beatty quadrangle. Roads are from the DOE/OCRWM/YMSCO database, coverage ROADNYES, reference G97558, based on U.S. Census Bureau, 1:100,000-scale TIGER data for Nye County, Nevada. 2002 Publication date Complete None planned -116.629 -116.287 36.973 36.566 USGS Thesaurus geology geologic maps geologic structure tectonic processes bedrock geologic units faulting (geologic) geospatial datasets none Neogene extensional faults Neogene strike-slip faults pre-Tertiary thrust faults Miocene calderas southwest Nevada volcanic field nonmarine sedimentary basins Tertiary and Quaternary basins Miocene densely welded tuffs Yucca Mountain Project U.S. Department of Energy U.S. Geological Survey caldera boundaries cross sections boreholes saturated-zone hydrologic flow model Claim Canyon caldera Timber Mountain caldera complex Belted Range thrust Specter Range thrust CP thrust gravity fault Highway 95 fault bedded tuffs ISO 19115 Topic Categories geoscientificInformation U.S. Board on Geographic Names (BGN) Geographic Names Information System (GNIS) Yucca Mountain Nye County, Nevada Crater Flat Calico Hills Jackass Flats Little Skull Mountain Striped Hills Skeleton Hills Amargosa Desert Nevada Test Site Black Marble Fortymile Canyon Shoshone Mountain Chocolate Mountain Comb Peak Claim Canyon Windy Wash Prow Pass Pinnacles Ridge Beatty Wash Dome Mountain Rock Valley Steve's Pass Lathrop Wells Cone Augmented FIPS 10-4 and FIPS 6-4 32023 = Nye none Tiva Canyon Tuff Topopah Spring Tuff Paintbrush Group Yucca Mountain Tuff Pah Canyon Tuff rhyolite of Delirium Canyon tuff of Pinyon Pass rhyolite of Comb Peak rhyolite of Vent Pass rhyolite of Waterpipe Butte rhyolite of Pinnacles Ridge Beatty Wash Formation lavas of Dome Mountain rhyolite of Shoshone Mountain basalt of Kiwi Mesa Rocket Wash tuff Lathrop Wells cinder cone Timber Mountain Group Ammonia Tanks Tuff Rainier Mesa Tuff rhyolite of Flourspar Canyon rhyolite of Windy Wash Tram Tuff tuff of Yucca Flat Lithic Ridge Tuff older tuffs of USW-G1 Crater Flat Group Bullfrog Tuff Prow Pass Tuff rhyolite of Prospector Pass Wahmonie Formation Calico Hills Formation Johnnie Formation Carrara Formation Bonanza King Formation Nopah Formation Pogonip Group Eureka Quartzite Ely Springs Dolomite Lone Mountain Dolomite Roberts Mountains Formation rocks of Calico Mines Eleana Formation Chainman Shale rocks of Pavits Spring rocks of Winapi Wash Quaternary basalts Basin and Range province Walker Lane belt Windy Wash fault Solitario Canyon fault Iron Ridge fault Paintbrush Canyon fault Bare Mountain fault Stagecoach Road fault none Tertiary None Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. Christopher J. Potter U.S. Geological Survey mailing address

Denver Federal Center, MS-939

Box 25046

Denver Colorado 80225 USA (303) 236-1735 cpotter@usgs.gov http://geo-nsdi.er.usgs.gov/metadata/map-i/2755/browse.png Reduced-size image of the entire map sheet, 582x836 pixels, 220k bytes PNG http://pubs.usgs.gov/imap/2002/i-2755/i-2755_map.pdf Printable representation of map layout, 30 megabytes PDF Bedrock geology mapped by Christopher J. Potter, Robert P. Dickerson, Donald S. Sweetkind, Ronald M. Drake II, Christopher J. Fridrich, and Warren C. Day, 1997-1998, and compiled from data sources cited below. Surficial geology mapped by Emily M. Taylor in 1998, and compiled from data sources cited below. Geologic contacts and faults digitized by Ronald M. Drake II, Carma A. San Juan, and Emily M. Taylor. ARC/INFO version 8.0.2 Part of the database consists of newly generated data (mapped or interpreted contacts and faults) that were compiled on mylar base maps and then in AutoCAD before being imported to ARC/ INFO. Part of the database was compiled from preexisting digital data and combined in AutoCAD before being imported to ARC/INFO. Frequency tests were run on the arc and polygon labels to ensure that no features are unlabeled. The attributes have been checked by both the authors and the reviewers for agreement with published maps, unpublished field mapping, and preliminary drafted versions of the map. The attribute data in the data set should be taken as an accurate representation of the authors' geologic interpretations. All lines were visually inspected by the authors for proper intersections, repetition, overshoots, undershoots, and overall logical consistency. The geologic features in the map area are all described, in the view of the authors, at a consistent scale of 1:50,000. All coverages were cleaned and built in ARC/INFO ( version 8.0.2) to ensure a logical consistency that is topologically clean. This dataset includes only the coverages pertaining to the geologic map. Any marginalia on the printed map (explanation of map symbols, and so forth) are not included. This map was produced to be used at 1:50,000 scale. Any geologic features too small to be shown at this scale have been omitted or generalized if they are of significant importance. The smallest objects are approximately 20 meters on a side. The estimated horizontal positional accuracy of the data is 65 meters. All data used from published and unpublished digital sources are limited by the accuracy of that data. Attempts were made to verify the accuracy of these data by comparison to published topographic data and overlap with other digital data. Ackermann, H.D. Mooney, W.D. Snyder, D.B. Sutton, V.D. 1988 U.S. Geological Survey Bulletin 1790 Carr, M.D. (editor) Yount, J.C. (editor) 1988 U.S. Geological Survey Bulletin 1790 Washington, D.C. U.S. Geological Survey paper 1988 Publication date Ackermann and others, 1988 Geophysical data guiding fault interpretation beneath Quaternary basins Bath, G.D. Jahren, C.E. 1984 U.S. Geological Survey Open-File Report 84-120 Denver, Colorado U.S. Geological Survey paper 1984 Publication date Bath and Jahren, 1984 Geophysical data guiding fault interpretation beneath Quaternary basins Blakely, R.J. Langenheim, V.E. Ponce, D.A. Dixon, G.L. 2000 U.S. Geological Survey Open-File Report 00-188 Menlo Park, California U.S. Geological Survey paper 2000 Publication date Blakely and others, 2000 Geophysical data and interpretations guiding fault interpretation beneath Quaternary basins Brocher, T.M. Carr, M.D. Fox, K.F., Jr. Hart, P.E. 1993 Geological Society of America Bulletin v. 105 Boulder, Colorado Geological Society of America paper 1993 Publication date Brocher and others, 1993 Geophysical data guiding fault interpretation beneath Quaternary basins Burchfiel, B.C. 1966 U.S. Geological Survey Miscellaneous Investigations Series Map I-474 Reston, Virginia U.S. Geological Survey 62500 pamphlet, map 1966 Publication date Burchfiel, 1966 Bedrock geologic contacts Byers, F.M., Jr. Carr, W.J. Christiansen, R.L. Lipman, P.W. Orkild, P.P. Quinlivan, W.D. 1976 U.S. Geological Survey Miscellaneous Investigations Series Map I-891 Reston, Virginia U.S. Geological Survey 48000 pamphlet, map 1976 Publication date Byers and others, 1976 Bedrock geologic contacts Christiansen, R.L. Lipman, P.W. 1965 U.S. Geological Survey Geologic Quadrangle Map GQ-444 Reston, Virginia U.S. Geological Survey 24000 map 1965 Publication date Christiansen and Lipman, 1965 Bedrock geologic contacts Cole, J.C. 1997 U.S. Geological Survey Open-File Report 97-533 Denver, Colorado U.S. Geological Survey 100000 paper, map 1997 Publication date Cole, 1997 Thrust fault locations Cole, J.C. Cashman, P.H. 1998 U.S. Geological Survey Open-File Report 98-101 Denver, Colorado U.S. Geological Survey 6000 paper, map 1998 Publication date Cole and Cashman, 1998 Bedrock geologic contacts Day, W.C. Dickerson, R.P. Potter, C.J. Sweetkind, D.S. San Juan, C.A. Drake, R.M. II Fridrich, C.J. 1998 U.S. Geological Survey Geologic Investigations Series Map I-2627 Denver, Colorado U.S. Geological Survey 24000 pamphlet, map 1998 Publication date Day and others, 1998 Bedrock geologic contacts Day, W.C. Potter, C.J. Sweetkind, D.S. Dickerson, R.P. San Juan, C.A. 1998 U.S. Geological Survey Miscellaneous Investigations Series Map I-2601 Denver, Colorado U.S. Geological Survey 6000 pamphlet, map 1998 Publication date Day and others, 1998 Bedrock geologic contacts Dickerson, R.P. Drake, R.M. II 1998 U.S. Geological Survey Open-File Report 97-783 Denver, Colorado U.S. Geological Survey 6000 paper, map 1998 Publication date Dickerson and Drake, 1998 Bedrock geologic contacts Faulds, J.E. Bell, J.W. Feuerbach, D.L. Ramelli, A.R. 1994 Nevada Bureau of Mines and Geology Map 101 Reno, Nevada Nevada Bureau of Mines and Geology 24000 map 1994 Publication date Faulds and others, 1994 Bedrock geologic contacts Frizzell, V.A., Jr. Shulters, J. 1990 U.S. Geological Survey Miscellaneous Investigations Series Map I-2046 Reston, Virginia U.S. Geological Survey 100000 map 1990 Publication date Frizzell and Shulters, 1990 Bedrock geologic contacts Greenhaus, M.R. Zablocki, C.J. 1982 U.S. Geological Survey Open-File Report 82-897 Denver, Colorado U.S. Geological Survey paper 1982 Publication date Greenhaus and Zablocki, 1982 Geophysical data guiding fault interpretation beneath Quaternary basins Healey, D.L. Harris, R.N. Ponce, D.A. Oliver, H.W. 1987 U.S. Geological Survey Open-File Report 87-506 Menlo Park, California U.S. Geological Survey 100000 paper, map 1987 Publication date Healey and others, 1987 Geophysical data guiding fault interpretation beneath Quaternary basins Kane, M.F. Bracken, R.E. 1983 U.S. Geological Survey Open-File Report 83-616 Denver, Colorado U.S. Geological Survey map, paper 1983 Publication date Kane and Bracken, 1983 Geophysical data guiding fault interpretation beneath Quaternary cover Langenheim, V.E. Ponce, D.A. Oliver, H.W. Sikora, R.F. 1993 U.S. Geological Survey Open-File Report 93-586-A Menlo Park, California U.S. Geological Survey paper 1993 Publication date Langenheim and others, 1993 Geophysical data guiding fault interpretation beneath Quaternary cover Lipman, P.W. McKay, E.J. 1965 U.S. Geological Survey Geologic Quadrangle Map GQ-439 Reston, Virginia U.S. Geological Survey 24000 map 1965 Publication date Lipman and McKay, 1965 Bedrock geologic contacts Maldonado, Florian 1985 U.S. Geological Survey Miscellaneous Investigations Series Map I-1519 Reston, Virginia U.S. Geological Survey 48000 map 1985 Publication date Maldonado, 1985 Bedrock geologic contacts McCafferty, A.E. Grauch, V.J.S. 1997 U.S. Geological Survey Geophysical Investigations Map GP-1015 Denver, Colorado U.S. Geological Survey 250000 map 1997 Publication date McCafferty and Grauch, 1997 Geophysical data guiding fault interpretation beneath Quaternary basins McKay, E.J. Sargent, K.A. 1970 U.S. Geological Survey Geologic Quadrangle Map GQ-883 Reston, Virginia U.S. Geological Survey 24000 map 1970 Publication date McKay and Sargent, 1970 Geophysical data guiding fault interpretation beneath Quaternary basins McKay, E.J. Williams, W.P. 1964 U.S. Geological Survey Geologic Quadrangle Map GQ-368 Reston, Virginia U.S. Geological Survey 24000 map 1964 Publication date McKay and Williams, 1964 Bedrock geologic contacts Monsen, S.A. Carr, M.D. Reheis, M.C. Orkild, P.P. 1992 U.S. Geological Survey Miscellaneous Investigations Series Map I-2201 Reston, Virginia U.S. Geological Survey 24000 map 1992 Publication date Monsen and others, 1992 Bedrock geologic contacts Orkild, P.P. O'Connor, J.T. 1970 U.S. Geological Survey Geologic Quadrangle Map GQ-849 Reston, Virginia U.S. Geological Survey 24000 map 1970 Publication date Orkild and O'Connor, 1970 Bedrock geologic contacts Ponce, D.A. 1996 U.S. Geological Survey Open-File Report 96-285 Menlo Park, California U.S. Geological Survey paper 1996 Publication date Ponce, 1996 Geophysical data guiding fault interpretation beneath Quaternary cover Ponce, D.A. Harris, R.N. Oliver, H.W. 1988 U.S. Geological Survey Open-File Report 88-664 Menlo Park, California U.S. Geological Survey 100000 map 1988 Publication date Ponce and others, 1988 Geophysical data guiding fault interpretation beneath Quaternary basins Ponce, D.A. Langenheim, V.E. 1994 U.S. Geological Survey Open-File Report 94-572 Menlo Park, California U.S. Geological Survey paper 1994 Publication date Ponce and Langenheim, 1994 Geophysical data guiding fault interpretation beneath Quaternary cover Ponce, D.A. Langenheim, V.E. Sikora, R.F. 1993 U.S. Geological Survey Open-File Report 93-540-A Menlo Park, California U.S. Geological Survey paper 1993 Publication date Ponce and others, 1993 Geophysical data guiding fault interpretation beneath Quaternary basins Sargent, K.A. McKay, E.J. Burchfiel, B.C. 1970 U.S. Geological Survey Geologic Quadrangle Map GQ-882 Reston, Virginia U.S. Geological Survey 24000 map 1970 Publication date Sargent and others, 1970 Bedrock geologic contacts Sargent, K.A. Stewart, J.H. 1971 U.S. Geological Survey Geologic Quadrangle Map GQ-884 Reston, Virginia U.S. Geological Survey 24000 map 1971 Publication date Sargent and Stewart, 1971 Bedrock geologic contacts Scott, R.B. 1996 U.S. Geological Survey Open-File Report 92-266 Denver, Colorado U.S. Geological Survey 12000 paper, map 1996 Publication date Scott, 1996 Bedrock geologic contacts Simonds, F.W. Whitney, J.W. Fox, K.F. Ramelli, A.R. Yount, J.C. Carr, M.D. Menges, C.M. Dickerson, R.P. Scott, R.B. 1995 U.S. Geological Survey Miscellaneous Investigations Series Map I-2520 Reston, Virginia U.S. Geological Survey 24000 map 1995 Publication date Simonds and others, 1995 Faults with Quaternary displacement Swadley, WC 1983 U.S. Geological Survey Miscellaneous Investigations Series Map I-1361 Reston, Virginia U.S. Geological Survey 48000 map 1983 Publication date Swadley, 1983 Surficial geologic contacts Swadley, WC Carr, W.J. 1987 U.S. Geological Survey Miscellaneous Investigations Series Map I-1767 Reston, Virginia U.S. Geological Survey 48000 map 1987 Publication date Swadley and Carr, 1987 Surficial geologic contacts Swadley, WC Hoover, D.L. 1989 U.S. Geological Survey Miscellaneous Investigations Series Map I-1994 Reston, Virginia U.S. Geological Survey 24000 map 1989 Publication date Swadley and Hoover, 1989a Surficial geologic contacts Swadley, WC Hoover, D.L. 1989b U.S. Geological Survey Miscellaneous Investigations Series Map I-2018 Reston, Virginia U.S. Geological Survey 24000 map 1989 Publication date Swadley and Hoover, 1989b Surficial geologic contacts Swadley, WC Parrish, L.D. 1988 U.S. Geological Survey Miscellaneous Investigations Series Map I-1826 Reston, Virginia U.S. Geological Survey 48000 map 1988 Publication date Swadley and Parrish, 1988 Surficial geologic contacts Wright, L. Troxel, B.W. 1993 U.S. Geological Survey Miscellaneous Investigations Series Map I-2305 Reston, Virginia U.S. Geological Survey 48000 map 1993 Publication date Wright and Troxel, 1993 Bedrock geologic contacts Bedrock geologic mapping and compilation of new mapping in AutoCAD. 1997 to 1998 Digitize and compile bedrock mapping from previously published sources, and modify these based on new mapping, using AutoCAD. 1997 to 1998 Interpret, digitize, and compile geophysically inferred faults, using AutoCAD. 1997 to 1998 Compile surficial geology on 1:24,000-scale orthophotoquad maps, combining new mapping with previously published sources. 1998 Digitize surficial geology using AutoCAD. 1998 Review of data by M. Chornack. 1998 Review of data by D. O'Leary. 1998 Review of data by M. Hudson. 1998 Review of data by W.R. Page. 1998 Review of data by C. Menges. 1998 Review of data by D. Buesch. 1998 Review of data by M. Fahy. 1999 Edit map in AutoCAD to address review comments. 1998 to 1999 Import digital map elements into ARC/INFO. 1999 Edits made in ARCEDIT to existing data include: unclosed polygons closed, incorrectly attributed polygons relabeled, incorrect structural symbols fixed, fault attributes and displacement symbols edited, and global changes made to colors. 1999 to 2002 Creation of original metadata record 20021122 Christopher J. Potter U.S Geological Survey mailing address

Box 25046

Denver Federal Center, MS-939

Denver Colorado 80225 USA 303-236-1735 Vector Universal Transverse Mercator 11 0.9996 -117 0.0 500000 0.0 coordinate pair 65 65 meters North American Datum of 1927 Clarke 1866 6378206.4 294.98 szgeol polygon Geologic units MAP_UNIT Lithostratigraphic symbol CZw Wood Canyon Formation Cb Bonanza King Formation Cc Carrara Formation Cn Nopah Formation Cz Zabriskie Quartzite DSd Dolomite Dc Dolomite limestone and sandy dolomite MDs Clastic sedimentary rocks (includes Eleana) Mc Chainman Shale Ou Sedimentary rocks, undivided (Ely Sprs. Eureka Pogonip) Qa Alluvium (Holocene) Qam Alluvium (late and middle Pleistocene) Qao Older alluvium (middle and early Pleistocene) Qay Younger alluvium (Holocene and late Pleistocene) Qay/Qam mantle of Qay over Qam Qay/Qem mantle of Qay over Qem Qbo Older Quaternary basalt Qby Younger Quaternary basalt Qe Eolian deposits (Holocene to middle Pleistocene) Qem Eolian-colluvial ramp deposits (Holocene-middle Pleis.) Qem/Qao mantle of Qem over Qao Qeo Older eolian sand (middle to early Pleistocene) Qey Eolian sand and fragments (Holocene and late Pleistocene) Qey/Qam mantle of Qey over Qam Qey/Qeo mantle of Qey over Qeo Qsd Spring deposits (Holocene to middle Pleistocene) Tac Calico Hills Formation Tbo Older Tertiary basalts (Miocene) Tby Younger Tertiary basalt of Crater Flat (Pliocene) Tcb Bullfrog Tuff Tcp Prow Pass Tuff Tcr Rhyolite of Prospector Pass Tcs Pre-Bullfrog Tuff bedded tuff Tct Tram Tuff Tfb Beatty Wash Formation Tfd Lavas of Dome Mountain Tfs Rhyolite of Shoshone Mountain Tgc Conglomerates, fanglomerates, and rock-avalanche breccia Ti Intrusions (Miocene) Tma Ammonia Tanks Tuff Tmb Rhyolite of Waterpipe Butte Tmp Rhyolite of Pinnacles Ridge Tmr Rainier Mesa Tuff Tmw Rhyolite of Windy Wash Tpbt Bedded tuff (Paintbrush Gp.) Tpc Tiva Canyon Tuff Tpcy Tuff of Pinyon Pass Tpd Rhyolite of Delirium Canyon Tpk Rhyolite of Comb Peak Tpp Pah Canyon Tuff Tpr Rhyolite lavas, undivided (Paintbrush Gp.) Tpt Topopah Spring Tuff Tpv Rhyolite of Vent Pass Tpx Paintbrush Group tuffs, undivided (flt zn: tectonically mixed) Tpy Yucca Mountain Tuff Trx Rock-avalanche breccia of southern Crater Flat (Miocene) Ts Older sedimentary rocks, undivided (Miocene and Oligocene Ttr Rocket Wash Tuff of Thirsty Canyon Group (Miocene) Tvo Older volcanic rocks, undivided (Miocene) Tvx Intracaldera and caldera margin megabreccia and mesobreccia Tvy Younger volcanic rocks (Pliocene to Miocene) Tw Wahmonie Formation Zs Stirling Quartzite UNIT_DESCRIPTION Brief description of the map unit symbol Text (values given as definitions for field MAP_UNIT) SSYM Shadeset symbol; a numeric code through which the proper polygon fill can be selected from the shadeset file for plotting the map. 0 999 szlines arc Linear map feature of geologic or cartographic signficance, including some symbols LAYER Geological or cartographic significance of the line BORDER_50K_MAP Extent of study area CALDERA Structural Boundary of Claim Canyon Caldera CONTACT Geologic contact - exposed or well constrained CONTACT_APPROX Geologic contact - approximately located CONTACT_CONCEALED Geologic contact - concealed beneath Quaternary cover or poorly exposed CONTACT_Q Geologic contact of Quaternary aged deposits CROSS_SECTION_LINES Location of cross sections A-A', B-B', C-C', and D-D' FAULT Fault - exposed or well constrained FAULT_APPROX Fault - approximately located FAULT_INFER_GEOL Fault - concealed and inferred beneath Quaternary cover FAULT_INFER_GP Fault - concealed beneath Quaternary cover and inferred from geophysical data FAULT_PRE_TERTIARY_THRUST Thrust fault - pre-Tertiary age, exposed or well constrained FAULT_PRE_TERTIARY_THRUST_INFER Thrust fault - pre-Tertiary age, concealed and inferred beneath Quaternary cover or poorly exposed FAULT_LOW_ANGLE_NORMAL Gently dipping normal fault SCARP_AL Fault scarps in Quaternary deposits SYMBOL_CALC_DIP Symbols displaying strike and dip of bedrock estimated using 3-point method SYMBOL_FLT_FLD Symbols displaying relative horizontal movement (paired arrows) on faults, teeth on reverse faults, and queries (uncertain) fault locations), and fold axes SYMBOL_FOLIATION Symbols displaying strike and dip of compaction foliation SYMBOL_HORIZ_BD Symbols displaying horizontal bedding SYMBOL_OVRTRN_BD Symbols displaying overturned bedding SYMBOL_STRIKE_DIP Symbols displaying strike and dip of bedding SYMBOL_VERT_BED Symbols displaying vertically dipping bedding UNIT_LABELS Line leaders from map unit to text describing bedrock geologic units UNIT_LABELS_Q Line leaders from map unit to text describing geologic units of Quaternary age All coverages contain the standardized attributes for arcs and polygons assigned by ARC/INFO. For arcs these attributes are: >COLUMN--ITEM_NAME----------WIDTH-----OUTPUT-----TYPE---#_DECIMALS >1-------FNODE#---------------4----------5---------B---------\ >5-------TNODE#---------------4----------5---------B---------\ >9-------LPOLY#---------------4----------5---------B---------\ >13------RPOLY#---------------4----------5---------B---------\ >17------LENGTH---------------8---------18---------F---------5 >25------<cover>#-------------4----------5---------B---------\ >29------<cover>-ID-----------4----------5---------B---------\ > >For polygons these attributes are: > >COLUMN--ITEM_NAME----------WIDTH-----OUTPUT-----TYPE---#_DECIMALS >1-------AREA-----------------8---------18---------F---------5 >9-------PERIMETER------------8---------18---------F---------5 >17------<cover>#-------------4----------5---------B---------\ >21------<cover>-ID-----------4----------5---------B---------\ > >COVERAGE-----FEATURE-----DESCRIPTION >Items/Attributes----------Values > >plate1-----lines-----cultural linework (roads, township and range, NTS boundary, map border and tics) > >ITEM: layer DESCRIPTION: >ROADS_FINAL Roads in study area >TOWN_RANGE Township and range boundaries >SECTIONS_100K Township and range section lines >NTS Nevada Test Site boundary >BORDER Map border >TICS_STATE_PLANE Nevada State Plane graticules >TICS_LAT_LONG Latitude and longitude graticules > >ball_bar-----lines--------displacement symbols on faults >ball_bar-----polygons-----displacement symbols on faults >ITEM: ssym DESCRIPTION: >1 Number corresponding to a shadeset symbol > >szgeol-----polygons-------geologic units >ITEMS: DESCRIPTION: >MAP_UNIT Lithostratigraphic symbols >UNIT_DESCRIPTION Description of lithostratigraphic symbols >SSYM Number corresponding to a shadeset symbol >(Values for the coverage items are presented in table format below) > >MAP_UNIT...UNIT_DESCRIPTION... SSYM >CZw Wood Canyon Formation 694 >Cb Bonanza King Formation 461 >Cc Carrara Formation 601 >Cn Nopah Formation 518 >Cz Zabriskie Quartzite 810 >DSd Dolomite 55 >Dc Dolomite limestone and sandy dolomite 52 >MDs Clastic sedimentary rocks (includes Eleana) 332 >Mc Chainman Shale 179 >Ou Sedimentary rocks, undivided (Ely Sprs. Eureka Pogonip) 238 >Qa Alluvium (Holocene) 748 >Qam Alluvium (late and middle Pleistocene) 705 >Qao Older alluvium (middle and early Pleistocene) 501 >Qay Younger alluvium (Holocene and late Pleistocene) 575 >Qay/Qam mantle of Qay over Qam 705 >Qay/Qem mantle of Qay over Qem 767 >Qbo Older Quaternary basalt 98 >Qby Younger Quaternary basalt 130 >Qe Eolian deposits (Holocene to middle Pleistocene) 759 >Qem Eolian-colluvial ramp deposits (Holocene-middle Pleis.) 767 >Qem/Qao mantle of Qem over Qao 501 >Qeo Older eolian sand (middle to early Pleistocene) 576 >Qey Eolian sand and fragments (Holocene and late Pleistocene) 715 >Qey/Qam mantle of Qey over Qam 705 >Qey/Qeo mantle of Qey over Qeo 576 >Qsd Spring deposits (Holocene to middle Pleistocene) 681 >Tac Calico Hills Formation 184 >Tbo Older Tertiary basalts (Miocene) 129 >Tby Younger Tertiary basalt of Crater Flat (Pliocene) 372 >Tcb Bullfrog Tuff 509 >Tcp Prow Pass Tuff 422 >Tcr Rhyolite of Prospector Pass 151 >Tcs Pre-Bullfrog Tuff bedded tuff 322 >Tct Tram Tuff 152 >Tfb Beatty Wash Formation 632 >Tfd Lavas of Dome Mountain 119 >Tfs Rhyolite of Shoshone Mountain 633 >Tgc Conglomerates, fanglomerates, and rock-avalanche breccia 652 >Ti Intrusions (Miocene) 217 >Tma Ammonia Tanks Tuff 721 >Tmb Rhyolite of Waterpipe Butte 111 >Tmp Rhyolite of Pinnacles Ridge 707 >Tmr Rainier Mesa Tuff 124 >Tmw Rhyolite of Windy Wash 905 >Tpbt Bedded tuff (Paintbrush Gp.) 116 >Tpc Tiva Canyon Tuff 901 >Tpcy Tuff of Pinyon Pass 732 >Tpd Rhyolite of Delirium Canyon 114 >Tpk Rhyolite of Comb Peak 154 >Tpp Pah Canyon Tuff 542 >Tpr Rhyolite lavas, undivided (Paintbrush Gp.) 155 >Tpt Topopah Spring Tuff 336 >Tpv Rhyolite of Vent Pass 554 >Tpx Paintbrush Group tuffs, undivided (flt zn: tectonically mixed) 577 >Tpy Yucca Mountain Tuff 514 >Trx Rock-avalanche breccia of southern Crater Flat (Miocene) 303 >Ts Older sedimentary rocks, undivided (Miocene and Oligocene 387 >Ttr Rocket Wash Tuff of Thirsty Canyon Group (Miocene) 555 >Tvo Older volcanic rocks, undivided (Miocene) 909 >Tvx Intracaldera and caldera margin megabreccia and mesobreccia 541 >Tvy Younger volcanic rocks (Pliocene to Miocene) 527 >Tw Wahmonie Formation 304 >Zs Stirling Quartzite 494 > >szlines-----lines-----attributed with ITEM layer as follows: >ITEM: layer DESCRIPTION: >BORDER_50K_MAP Extent of study area >CALDERA Structural Boundary of Claim Canyon Caldera >CONTACT Geologic contact - exposed or well constrained >CONTACT_APPROX Geologic contact - approximately located >CONTACT_CONCEALED Geologic contact - concealed beneath Quaternary cover or poorly exposed >CONTACT_Q Geologic contact of Quaternary aged deposits >CROSS_SECTION_LINES Location of cross sections A-A', B-B', C-C', and D-D' >FAULT Fault - exposed or well constrained >FAULT_APPROX Fault - approximately located >FAULT_INFER_GEOL Fault - concealed and inferred beneath Quaternary cover >FAULT_INFER_GP Fault - concealed beneath Quaternary cover and inferred from geophysical data >FAULT_PRE_TERTIARY_THRUST Thrust fault - pre-Tertiary age, exposed or well constrained >FAULT_PRE_TERTIARY_THRUST_INFER Thrust fault - pre-Tertiary age, concealed and inferred beneath Quaternary cover or poorly exposed >FAULT_LOW_ANGLE_NORMAL Gently dipping normal fault >SCARP_AL Fault scarps in Quaternary deposits >SYMBOL_CALC_DIP Symbols displaying strike and dip of bedrock estimated using 3-point method >SYMBOL_FLT_FLD Symbols displaying relative horizontal movement (paired arrows) on faults, teeth on reverse faults, and queries (uncertain) fault locations), and fold axes >SYMBOL_FOLIATION Symbols displaying strike and dip of compaction foliation >SYMBOL_HORIZ_BD Symbols displaying horizontal bedding >SYMBOL_OVRTRN_BD Symbols displaying overturned bedding >SYMBOL_STRIKE_DIP Symbols displaying strike and dip of bedding >SYMBOL_VERT_BED Symbols displaying vertically dipping bedding >UNIT_LABELS Line leaders from map unit to text describing bedrock geologic units >UNIT_LABELS_Q Line leaders from map unit to text describing geologic units of Quaternary age > >szlines-----annotation-----Text for geologic units, borehole and map symbol labels >subclass: anno.dxf Description >Level >1 geology labels >3 fault names >4 cross section trace labels >5 borehole labels >6 foliation labels >7 measured strike and dip labels >8 calculated strike and dip labels >9 overturned bedding labels >10 queries symbols(?)on fault traces > >szlines-----points-----borehole locations >ITEM: layer DESCRIPTION: >BOREHOLES_1996 Location of selected bore holes in study area > >Topo24k_pot-----arcs-----topographic base >ITEMS: DESCRIPTION: >elev_ft elevation of line >index200 1 if line is a 200 ft index contour, otherwise 0 http://pubs.usgs.gov/imap/2002/i-2755/i-2755_pam.pdf U.S. Geological Survey Central Publications Group mailing address

Box 25046 Denver Federal Center, MS-902

Denver Colorado 80225 USA 303-236-5486 Although these digital spatial data have been subjected to rigorous review and are substantially complete, they are released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from their authorized or unauthorized use. ArcInfo export 8.0.2 Geologic units and structural features unzip .zip or gzip -d the tar.gz 7 megabytes http://pubs.usgs.gov/imap/2002/i-2755/i-2755.tar.gz http://pubs.usgs.gov/imap/2002/i-2755/i-2755.zip None 20130501 Peter N Schweitzer USGS Midwest Area Geologist mailing address

Mail Stop 954 12201 Sunrise Valley Dr

Reston VA 20192-0002 USA 703-648-6533 703-648-6252 pschweitzer@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 None None