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
Funding for map project was provided by the U.S. Department of Energy. Permission for field access was granted by, and a field escort was provided by, the Nellis Air Force Range. T.R. Brandt and J.B. Workman assisted in compiling the digital database and in preparing the digital cartographic output.
To provide a digital geologic map database of the quadrangle that improves understanding of the regional geologic framework and its influence on the regional groundwater flow system.
Are there legal restrictions on access or use of the data?
Use_Constraints:none--Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. These data are not to be used at scales larger than 1:24,000.
Although this digital spatial data has been subjected to rigorous review and is substantially complete, it is released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
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