Geologic map and map database of the Palo Alto 30' X 60' quadrangle, California

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Description This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits in the mapped area. Together with the accompanying text file (pamf.p
Originators Brabb, Earl E.; Graymer, Russell W.; and Jones, D. L.
Publication U.S. Geological Survey Miscellaneous Field Studies Map MF-2332

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Overview of attributes

All coverages contain the standardized attributes for arcs and polygons assigned by ARC/INFO.  For arcs these attributes are:
>For polygons these attributes are:
>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
>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

szgeol polygon

Geologic units

Label Definition
MAP_UNIT Lithostratigraphic symbol
UNIT_DESCRIPTION Brief description of the map unit symbol
SSYM Shadeset symbol; a numeric code through which the proper polygon fill can be selected from the shadeset file for plotting the map.

szlines arc

Linear map feature of geologic or cartographic signficance, including some symbols

Label Definition
LAYER Geological or cartographic significance of the line