Digital geologic map of the Thirsty Canyon NW quadrangle, Nye County, Nevada

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Description This digital geologic map compilation presents new polygon (i.e., geologic map unit contacts), line (i.e., fault, fold axis, dike, and caldera wall), and point (i.e., structural attitude) vector data for the Thirsty Canyon NW 7 1/2' quadrangle in southern
Originators Minor, Scott A.
Publication U.S. Geological Survey Open-File Report 98-623

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Overview of attributes

The geologic map database comprises six component ArcINFO map coverages (tcnwpoly, tcnwflt, tcnwfold, tcnwdike, tcnwcald, and tcnwatt).  The tcnwpoly coverage contains all contact lines and labelpoints for each of the map polygons.  The database includes four line coverages that depict faults (tcnwflt), fold axes (tcnwfold), dikes (tcnwdike), and caldera-wall segments (tcnwcald).  Faults that are contacts also appear in the tcnwpo

Listed below are definitions of alpha and numeric attribute codes that are embedded in the various INFO files (i.e., TCNW*.PAT and TCNW*.AAT files) associated with the geologic Arc coverages. The name of the INFO file containing the listed attribute codes is present above each list, and those column headings in each list with capitalized letters correspond to custom ITEMS in the INFO files that contain the listed codes. >TCNWPOLY.PAT: >(Numeric codes associated with the item COLOR in the TCNWPOLY.PAT file refer to map-unit polygon colors defined in the Arc shadeset file color524.shd.) > >UNIT# LABEL Definition >1 Qay Young alluvium (Holocene and late Pleistocene) >2 QTc Colluvium (Quaternary and Pliocene) >3 Qam Middle alluvium (middle Pleistocene) > Basalt of Little Black Peak (middle Pleistocene) >4 Qbbc Cinder cone >5 Qbbl Lava flow > Basalt of Hidden Cone (middle Pleistocene) >6 Qbhc Cinder cone >7 Qbhl3 Upper lava flow >8 Qbhl2 Middle lava flow >9 Qbhl1 Lower lava flow >10 QTa Old alluvium (early Pleistocene and Pliocene?) >11 Typ Basalt of Thirsty Mountain (Pliocene) >12 Typv Vent-facies scoria deposits >13 Tgo Gravel of Oasis Valley (Pliocene and Miocene) >14 Ttb Thirsty Canyon and younger basalts (Miocene) > Thirsty Canyon Group (Miocene) >15 Ttg Gold Flat Tuff >16 Tts Trachytic lavas of Pillar Spring >17 Ttf Black Mountain caldera moat-filling sediments >18 Ttt Trail Ridge Tuff >19 Ttp Pahute Mesa Tuff >20 Ttr Rocket Wash Tuff >21 Ttc Comendite of Ribbon Cliff >22 Tte Pre-Thirsty Canyon basaltic rocks (Miocene) >23 Tbd Basalt dikes (Miocene) >24 Tfu Tuff and tuffaceous sedimentary rocks, undivided (Miocene) >25 Txmr Gravity-slide breccia of Rainier Mesa Tuff (Miocene) > Timber Mountain Group (Miocene) >26 Tma Ammonia Tanks Tuff >27 Tmt Basalts in Timber Mountain Group >28 Tmr Rainier Mesa Tuff > Paintbrush Group (Miocene) >29 Tpc Tiva Canyon Tuff >30 Txbg Gravity-slide breccia of Grouse Canyon Tuff (Miocene) > Belted Range Group (Miocene) >31 Tbg Grouse Canyon Tuff >32 Tbgb Bedded Grouse Canyon Tuff >33 Tob Older basalt (Miocene) > Volcanic rocks of Quartz Mountain (Miocene) >34 Tqg Crystal-poor rhyolite lava >36 Txqs Gravity-slide breccia of tuff of Sleeping Butte >37 Txqh Gravity-slide breccia of hornblende rhyolite lava > Tuff of Sleeping Butte >38 Tqsu Upper nonwelded tuff > Lower welded tuff >39 Tqsp Upper partly welded facies >40 Tqsm Middle welded facies >41 Tqsl Lower crystal-poor welded facies >42 Tqp Pyroxene rhyolite lava >43 Tqpb Pyroxene rhyolite pyroclastic rocks >44 Tqh Hornblende rhyolite lava >45 Tqhb Hornblende rhyolite pyroclastic rocks >46 Tqht Partly welded tuff >47 Tqt? Tuff of Tolicha Peak? >48 Tqhs Sedimentary rocks >49 Typd Feeder dikes (Basalt of Thirsty Mountain) (Pliocene) > > >TCNWFLT.AAT: > >FAULT_SLIP Definition >und fault slip not determined >Lbb normal fault; down-to-left (with respect to origin of digital fault line) apparent offset >Rbb normal fault; down-to-right apparent offset >Rss strike-slip fault; right-lateral sense of movement >Lss strike-slip fault; left-lateral sense of movement >Lro oblique-slip fault; down-to-left / right-lateral sense of movement >Llo oblique-slip fault; down-to-left / left-lateral sense of movement >Rro oblique-slip fault; down-to-right / right-lateral sense of movement >Rlo oblique-slip fault; down-to-right / left-lateral sense of movement >vent concealed linear vent of basalt of Thristy Mountain inferred from geophysical data > >FAULT_TRACE Definition >well well located fault >inf approximately located/inferred fault >con concealed fault >geophys concealed structure; location constrained by geophysical expression > > >TCNWATTS.PAT: >(Each record in TCNW.PAT includes a strike AZIMUTH and a DIP value, where the strike azimuth is measured clockwise with respect to north and the dip direction is 90o clockwise relative to the azimuth (i.e., "right hand rule"). In the case of fault plane measurements, TREND and PLUNGE indicate the orientation of slickenside striations or lineations.) > >TYPE Definition >BED inclined bedding >FOL compaction or flow foliation >FLT fault plane >MES mesoscale fault plane