Identification_Information: Citation: Citation_Information: Originator: William R. Page Originator: Scott C. Lundstrom Originator: Anita G. Harris Originator: Victoria E. Langenheim Originator: Jeremiah B. Workman Originator: Shannon A. Mahan Originator: James B. Paces Originator: Gary L. Dixon Originator: Peter D. Rowley Originator: B. C. Burchfiel Originator: John W. Bell Originator: Eugene I. Smith Publication_Date: 2005 Title: Geologic and Geophysical maps of the Las Vegas 30' X 60' Quadrangle, Clark and Nye Counties, Nevada, and Inyo County, California Edition: Version 1.0 Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: I-2814 Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/sim/2005/2814 Description: Abstract: Las Vegas and Pahrump are two of the fastest growing cities in the US, and the shortage of water looms as among the greatest future problems for these cities. These new maps of the Las Vegas 30 x 60-minute quadrangle provide a geologic and geophysical framework and fundamental earth science database needed to address societal issues such as ground water supply and contamination, surface flood, landslide, and seismic hazards, and soil properties and their changing impact by and on urbanization. The mountain ranges surrounding Las Vegas and Pahrump consist of Mesozoic, Paleozoic and Proterozoic rocks. A majority of these rocks are Paleozoic carbonate rocks that are part of Nevada's carbonate rock aquifer province. The Spring Mountains represent a major recharge site in the province, where maximum altitude is 3,632 m (Charleston Peak) above sea level. Rocks in the Sheep and Las Vegas Ranges and Spring Mountains contain correlative, northeast-striking, southeast-verging thrust faults that are part of the Cretaceous, Sevier orogenic belt. These thrusts were offset during the Miocene by the Las Vegas Valley shear system (LVVSZ). We conducted new mapping in the Blue Diamond area, highlighting refined work on the Bird Spring thrust, newly studied ancient landslides, and gravity-slide blocks. We conducted new mapping in the Las Vegas Range and mapped previously unrecognized structures such as the Valley thrust and fold belt; recognition of these structures has led to a refined correlation of Mesozoic thrust faults across the LVVSZ. New contributions in the quadrangle also include a greatly refined stratigraphy of Paleozoic bedrock units based on conodont biostragraphy. We collected over 200 conodont samples in the quadrangle and established stratigraphic reference sections used to correlate units across the major Mesozoic thrust faults. Quaternary deposits cover about half of the map area and underlie most of the present urbanized area. Deposits consist of large coalescing alluvial fans that grade downslope to extensive areas of fine-grained sediment indicative of groundwater-discharge during the Pleistocene. In the central areas of Las Vegas and Pahrump valleys, Quaternary fault scarps associated with past ground-water discharge deposits suggest a genetic relationship. In collaboration with NBMG and University of Nevada, a variety of ages of gravelly alluvium are newly mapped using surficial characteristics and soil development, along with reassessment of previously published mapping during compilation. Reconnaissance geochronology (thermoluminescence and U-series) of eolian and authigenic components of surficial and buried soils and spring deposits is applied to test hypotheses of geomorphic and hydrologic response to climate change over the past 100 k.y.). The major structure in the Las Vegas quadrangle is the LVVSZ. Because the LVVSZ is concealed by thick basin-fill deposits of Quaternary and Tertiary age, it was characterized primarily based on geophysics. Likewise, the newly described State line fault system in Pahrump Valley has also been characterized by geophysics, where geophysically inferred structures correlate remarkably with surface structures defined by our new geologic mapping in the Mound Spring and Hidden Hills Ranch 7.5-minute quadrangles. Purpose: To update and reinterpret earlier geologic mapping, to provide the results of new mapping, and to achieve a uniform regional geologic database. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2005 Currentness_Reference: publication date Status: Progress: complete Maintenance_and_Update_Frequency: none planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -116.000 East_Bounding_Coordinate: -115.000 North_Bounding_Coordinate: 36.500 South_Bounding_Coordinate: 36.000 Keywords: Theme: Theme_Keyword_Thesaurus: AGI Glossary of Geology Theme_Keyword: Geologic map Theme_Keyword: Paleozoic carbonate rocks Theme_Keyword: Sevier orogenic belt Theme_Keyword: Las Vegas Valley shear zone Theme_Keyword: Quaternary deposits Theme_Keyword: Quaternary fault scarps Place: Place_Keyword_Thesaurus: Board of Geographic Names Place_Keyword: USA Place_Keyword: Nevada Place_Keyword: California Place_Keyword: Clark County Place_Keyword: Nye County Place_Keyword: Inyo County Place_Keyword: Las Vegas Place_Keyword: Pahrump Place_Keyword: Mt. Charelston Place_Keyword: Sheep Range Place_Keyword: Las Vegas Range Place_Keyword: Spring Mountains Place_Keyword: Frenchman Mountain Access_Constraints: none 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 1:100,000. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: William R. Page Contact_Organization: U. S. Geological Survey Contact_Address: Address_Type: mailing address Address: Box 25046 Address: Denver Federal Center, MS 980 City: Denver State_or_Province: CO Postal_Code: 80225 Country: U.S.A. Contact_Voice_Telephone: 303-236-1141 Contact_Facsimile_Telephone: 303-236-5349 Contact_Electronic_Mail_Address: rpage@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/sim/2005/2814 Browse_Graphic_File_Description: graphical representation of map Browse_Graphic_File_Type: pdf Native_Data_Set_Environment: SunOS, 5.7, sun4m UNIX ARC/INFO version 8.1 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Data was attributed both by the geologists making the observations and by GIS specialists using 1:24,000-scale, 1:62,500-scale, and 1:100,000-scale maps annotated by the geologists. The database was thoroughly reviewed by the authors and other geologists familiar with the geology of the area on 1:24,000, 1:62,500 and 1:100,000-scale printouts of the map. This database is an accurate representation of the authors' interpretation of the geology. The database was also reviewed by selected authors (GIS specialists) and USGS GIS specialists. Label-error tests were run on all attributes of all coverages to assure against unattributed and improperly attributed entities. Errors found as a result of these tests were then corrected and tests run again until no errors were found. All attributed linework follows the right-hand-rule such that all line decoration symbols (barbs, teeth, etc.) are to the right of the arc facing in the direction of the arc. Logical_Consistency_Report: New linework was digitized at 1:24,000 scale from paper base maps. All new mapping was visually checked and reviewed by the authors at 1:24,000-scale and all of the database was checked and reviewed at 1:100,000 for improperly intersecting lines, overshoots, undershoots, and inconsistency in mapping coverage and detail. Coverages were built and cleaned in Arc/INFO version 8.1 after completion of all edits. The logical consistency is topologically clean for all coverages. Completeness_Report: This dataset includes only the coverages pertaining to the geologic map and geophysical data. Any margin material on the printed map (correlation chart, explanation of map symbols, cross sections) is not included. This map was produced to be used at 1:100,000-scale and has been generalized from more detailed mapping. 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 45 to 50 meters on a side. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The estimated accuracy is 15 to 20 meters. This database was produced to be used at 1:100,000-scale and any problems arising from use at other scales are not the responsibilities of the authors. No vertical data is included in the database. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Axen, G.J. Publication_Date: 1985 Title: Geologic map and description of structure and stratigraphy, La Madre Mountain, Spring Mountains, Nevada Series_Information: Series_Name: Geological Society of America Map and Chart Series Issue_Identification: MC-51 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1985 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Axen (1985) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Bell, J.W. Originator: Ramelli, A.R. Originator: Caskey, S.J. Publication_Date: 1998 Title: Geologic Map of the Tule Springs Park Quadrangle, Clark County, Nevada Series_Information: Series_Name: Nevada Bureau of Mines and Geology Map Issue_Identification: 113 Source_Scale_Denominator: 24000 Type_of_Source_Media: map Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1998 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Bell and others (1998) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Bell, J.W. Originator: Ramelli, A.R. Originator: dePolo, C.M. Originator: Maldonado, F. Originator: Schmidt, D.L. Publication_Date: 1999 Title: Geologic Map of the Corn Creek Springs Quadrangle, Clark County, Nevada Series_Information: Series_Name: Nevada Bureau of Mines and Geology Map Issue_Identification: 121 Source_Scale_Denominator: 24000 Type_of_Source_Media: map Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Bell and others (1999) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Bingler, E.C. Publication_Date: 1977 Title: Geologic map of the Las Vegas SE quadrangle, Clark County, Nevada Series_Information: Series_Name: Nevada Bureau of Mines and Geology Map Issue_Identification: 3Ag Source_Scale_Denominator: 24000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1977 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Bingler (1977) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Bohannon, R.G. Originator: Morris, R.W. Publication_Date: 1983 Title: Geology and mineral resources of the Red Rocks escarpment instant study area, Clark County, Nevada Source_Scale_Denominator: 62500 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1983 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Bohannon and Morris (1983) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Burchfiel, B.C. Originator: Fleck, R. Originator: Secor, D.T. Originator: Vincelette, R.R. Originator: Davis, G.A. Publication_Date: 1974 Title: Geology of the Spring Mountains, Nevada Series_Information: Series_Name: Geological Society of America Bulletin Issue_Identification: v. 85, p. 1013-1022 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1974 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burchfiel and others (1974) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Carr, M.D. Publication_Date: 1992 Title: Bedrock geologic map of the Blue Diamond NE 7.5' quadrangle, Clark County, Nevada Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: OF-92-263 Source_Scale_Denominator: 24000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1992 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Carr (1992) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Carr, M.D. Originator: McDonnell-Canan, Cheryl Publication_Date: 1992 Title: Bedrock geologic map of the Blue Diamond SE 7.5' quadrangle, Clark County Nevada Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: OF-92-177 Source_Scale_Denominator: 24000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1992 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Carr and McDonnell-Canan (1992) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Carr, M.D. Originator: McDonnell-Canan, Cheryl Originator: Weide, D. L. Publication_Date: 2000 Title: Geologic map of the Blue Diamond SE quadrangle, Nevada Series_Information: Series_Name: Nevada Bureau of Mines and Geology Map Issue_Identification: 123 Source_Scale_Denominator: 24000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2000 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Carr and others (2000) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Depolo, C.M. Originator: Ramelli, A.R. Originator: Bell, J.W. Publication_Date: 1999 Title: Geologic map of the Pahrump quadrangle, Nevada Series_Information: Series_Name: Nevada Bureau of Mines and Geology Open-File Report Issue_Identification: 99-14 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Depolo and others (1999) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Ebanks, W.J., Jr. Publication_Date: 1965 Title: Structural geology of the Gass Peak area, Las Vegas Range, Nevada Series_Information: Series_Name: M.A. Thesis Issue_Identification: none Publication_Information: Publication_Place: Houston, TX Publisher: Rice University Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1965 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Ebanks (1965) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Haynes, C.V. Publication_Date: 1967 Title: Quaternary Geology of the Tule Springs Area, Clark County, Nevada Series_Information: Series_Name: Nevada State Museum Anthropological Paper Issue_Identification: no. 13 Larger_Work_Citation: Citation_Information: Originator: Wormington, H.M. (ed.) Originator: Ellis, D. (ed.) Publication_Date: 1967 Title: Pleistocene Studies of Southern Nevada Series_Information: Series_Name: Nevada State Museum Anthropological Paper Issue_Identification: no. 13 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1967 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Haynes (1967) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Hoffard, J.L. Publication_Date: 1991 Title: Quaternary tectonics and basin history of Pahrump and Stewart valleys, Nevada and California Series_Information: Series_Name: M.S. Thesis Issue_Identification: none Publication_Information: Publication_Place: Reno, NV Publisher: University of Nevada Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1991 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Hoffard (1991) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Lundstrom, S.C. Originator: Page, W.R. Originator: Langenheim, V.E. Originator: Young, O.D. Originator: Mahan, S.A. Publication_Date: 1998 Title: Preliminary geologic map of the Valley quadrangle, Clark County, Nevada, 1:24,000 scale Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: OF-98-508 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1998 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Lundstrom and others (1998) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Lundstrom, S.C. Originator: Mahan, S.A. Originator: Blakely, R.J. Originator: Paces, J.B. Originator: Young, O.D. Originator: Dixon, G.L. Publication_Date: 2003 Title: Geologic map of the Mound Spring quadrangle, Nye County, Nevada and Inyo County, California Series_Information: Series_Name: U.S. Geological Survey Miscellaneous Field Investigations Issue_Identification: Map MF-2339 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Lundstrom and others (2003) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Maldonado, Florian Originator: Schmidt, D.L. Publication_Date: 1991 Title: Geologic map of the southern Sheep Range, Fossil Ridge, and Castle Rock area, Clark County, Nevada Series_Information: Series_Name: U.S. Geological Survey Miscellaneous Investigations Series Map Issue_Identification: I-2086 Source_Scale_Denominator: 24000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1991 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Maldonado and Schmidt (1991) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Matti, J.C. Originator: Bachuber, F.W. Publication_Date: 1985 Title: Las Vegas NW Quadrangle geologic map, Clark County, Nevada Series_Information: Series_Name: Nevada Bureau of Mines and Geology Urban Map Issue_Identification: 3Dg Source_Scale_Denominator: 24000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1985 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Matti and Bachuber (1985) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Matti, J.C. Originator: Castor, S.B. Originator: Bell, J.W. Originator: Rowland, S.M. Publication_Date: 1987 Title: Geologic map of the Las Vegas NE quadrangle, Clark County, Nevada Series_Information: Series_Name: Nevada Bureau of Mines and geology quadrangle Map Issue_Identification: 3Cg Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1987 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Matti and others (1987) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Matti, J.C. Originator: Castor, S.B. Originator: Bell, J.W. Originator: Rowland, S.M. Publication_Date: 1993 Title: Las Vegas NE Quadrangle geologic map, Clark County, Nevada Series_Information: Series_Name: Nevada Bureau of Mines and Geology Urban Map Issue_Identification: 3Dg Source_Scale_Denominator: 24000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1993 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Matti and others (1993) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: McDonnell-Canan, C. Originator: Axen, Gary Originator: Carr, M. D. Originator: Weide, D. L. Publication_Date: 2000 Title: Geologic Map of the Blue Diamond NE Quadrangle, Nevada Series_Information: Series_Name: Nevada Bureau of Mines and Geology Map Issue_Identification: 124 Source_Scale_Denominator: 24000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2000 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: McDonnell-Canan and others (2000) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Page, W.R. Originator: Dixon, G.L. Originator: Workman, J.B. Title: The Blue Diamond landslide; A Tertiary breccia deposit in the Las Vegas area, Clark County, Nevada Publication_Date: 1998 Series_Information: Series_Name: Geological Society of America Map and Chart Series Issue_Identification: MCH083 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1998 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Page and others (1998) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Quade, J. Title: Late Quaternary environmental changes in the upper Las Vegas Valley, Nevada Publication_Date: 1986 Series_Information: Series_Name: Quaternary Research Issue_Identification: V. 26 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1986 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Quade (1986) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Sowers, J.M. Title: Geomorphic map of the Kyle Canyon alluvial fan, Clark County, Nevada Publication_Date: 1986 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: OF-86-210 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1986 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Sowers (1986) Source_Contribution: mapping reference Source_Information: Source_Citation: Citation_Information: Originator: Williams, V. S. Title: GSMCAD, a new computer program that combines the functions of the GSMAP and GSEDIT programs and is compatible with Microsoft Windows and ARC/INFO Publication_Date: 1996 Series_Information: Series_Name: U. S. Geological Survey Open-File Report Issue_Identification: OF-96-007 Type_of_Source_Media: disc Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1996 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Williams (1996) Source_Contribution: software for digitizing source and field maps Process_Step: Process_Description: Source and new mapping digitized in GSMCAD (Williams, 1996) from 1:24,000-scale and 1:62,500-scale paper maps. Process_Date: 1998 to 2000 Process_Step: Process_Description: Data converted to ARC ASCII generate files and imported into ARC/INFO. Process_Date: 2001 Process_Step: Process_Description: Report reviewed by J. Faulds of NV Bureau of Mines and Geology. Process_Date: 2000 Process_Step: Process_Description: Report reviewed by C. Menges of US Geological Survey. Process_Date: 2000 Process_Step: Process_Description: Data edited in ArcEdit. Process_Date: 2001 to 2002 Process_Step: Process_Description: Data prepared for publication. Process_Date: 2002 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 11 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -117.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 2.5 Ordinate_Resolution: 2.5 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: ************************************************************* >>ASCII POINT DATA INCLUDED IN THIS DATASET<< LV_MAG-GRID.AXYZ - Point data for longitude, latitude, and magnetic value of 1-km grid (NAD27) over map area ************************************************************* >>DOUBLE PRECISION COVERAGES INCLUDED IN THIS DATASET<< LV_GEOL (arc/poly) all contacts; certain and approximately located faults; unit polygons LV_FLT (arc) fold axis lines; concealed faults LV_PNT (point) bedding attitudes; contact and fault plane attitudes; sample locations LV_SYM (arc/point) cartographic lines for drawing fault offset symbols, fold orientation symbols, bedding/foliation attitude symbols, sample location symbols, etc.; cartographic points for posting dip values LV_ISO (arc) contours of isostatic gravity anomalies LV_ISO-PNT (arc) sample locations for new and old isostatic gravity data LV_MAG (arc) contours of aeromagnetic anomalies LV_MAG-MAX (arc) locations of magnetic boundaries (maxspots) LV_PROF (arc) geophysically modeled profile locations ************************************************************* >>LV_GEOL.PAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 AREA 8 18 F 5 - 9 PERIMETER 8 18 F 5 - 17 LV_GEOL# 4 5 B - - 21 LV_GEOL-ID 4 5 B - - 25 UNIT# 5 5 I - - 30 UNIT 5 5 C - - 35 DESCRIPTION 100 100 C - - 135 SYMBOL 3 3 I - - USER DEFINED ITEM DESCRIPTIONS: UNIT - Geologic unit symbol DESCRIPTION - Geologic unit name (see pamphlet for full description of units) SYMBOL - Unique number given to map unit representing color value taken from shadeset 'color524.shd' USER DEFINED ITEM VALUES: UNIT, SYMBOL, DESCRIPTION ---------------------------- CZw, 251, Wood Canyon Formation (Lower Cambrian and Late Proterozoic Cb, 136, Bright Angel Shale (Middle and Lower Cambrian) Cbk, 67, Bonanza King Formation (Upper and Middle Cambrian) Cc, 133, Carrara Formation (Middle and Lower Cambrian) Cn, 112, Nopah Formation (Upper Cambrian) Ct, 137, Tapeats Sandstone (Lower Cambrian) DOCm, 154, Mountain Springs Formation (Middle Devonian, Upper Ordovician, Lower Ordovician and Upper Cambrian?) DSu, 131, Devonian and Silurian rocks undivided (Lower Devonian and Lower Silurian) Dsi, 142, Simonson Dolomite (Middle Devonian) Du, 126, Devonian rocks, undivided (Middle and Lower Devonian) Ja, 227, Aztec Sandstone (Jurassic) MDu, 101, Mississippian and Devonian rocks, undivided (Lower Mississippian and Upper and Middle Devonian) Mm, 167, Monte Cristo Group (Upper and Lower Mississippian) OCp, 256, Pogonip Group (Middle Ordovician to Upper Cambrian Oe, 99, Eureka Quartzite (Middle Ordovician) Oes, 94, Ely Springs Dolomite (Upper Ordovician) PMb, 125, Bird Spring Formation, undivided (Lower Permian to Upper Mississippian) and Indian Springs Formation PMbl, 125, Bird Spring Formation, lower member (upper Wolfcampian to Chesterian) PMc, 254, Pakoon Fm equivalent (Lower Permian), Callville Lm (Pennsylvanian), and Indian Springs Fm equivalent Pbu, 252, Bird Spring Formation, upper member (Leonardian and uppermost Wolfcampian) Pkt, 240, Kaibab and Toroweap Formations, undivided (Lower Permian) Pr, 228, Lower Permian redbeds QTa, 109, Gravelly basin-fill alluvium (Pleistocene to late Miocene?) QTbo, 224, Lower part of basin-fill of Brown Spring, (middle and early? Pleistocene to Pliocene?) QTs, 223, Undivided fine-grained sediments of the Las Vegas Valley (Quaternary and Tertiary?) Qai, 85, Intermediate fan alluvium (late and middle? Pleistocene) Qaiy, 62, Younger intermediate fan alluvium (late Pleistocene) Qao, 107, Old alluvium (Pleistocene) Qaoi, 86, Undivided Pleistocene alluvium Qau, 108, Undivided young and intermediate alluvium (Holocene and late Pleistocene) Qay, 39, Young fan alluvium (Holocene and latest Pleistocene) Qayo, 40, Older young alluvium (Holocene and latest Pleistocene) Qayy, 2, Youngest alluvium (Holocene) Qbw, 222, Middle white limestone of basin-fill of Browns Spring, (middle Pleistocene) Qby, 216, Upper part of basin-fill of Browns Spring, (middle Pleistocene) Qcf, 50, Hillslope colluvium and alluvium (Holocene and Pleistocene?) Qd, 243, Dune sand (late Holocene) Qfo, 102, Older fine-grained deposits (Holocene) Qfw, 122, Fine-grained sediments of Whitney Mesa (middle Pleistocene) Qfy, 80, Intermittently active fluvial fine-grained alluvium (late Holocene) Qpy, 6, Modern playa sediment (late Holocene) Qsab, 82, Older fine-grained deposits units A and B (late? to middle Pleistocene) Qscd, 225, Unit C and D-intermediate fine-grained deposits associated with past ground-water discharge Qse, 224, Unit E-young fine-grained deposits associated with past ground-water discharge Qso, 82, Old fine-grained spring deposits (middle Pleistocene) Qsu, 233, Undivided young and intermediate fine-grained deposits associated with past ground-water discharge Qsy, 221, Undivided young spring deposits (Holocene) Qsyy, 78, Youngest spring deposits (late Holocene) TRc, 127, Chinle Formation (Upper Triassic) TRml, 231, Moenkopi Formation, lower unit (Lower Triassic) TRmu, 145, Moenkopi Formation, upper member (Middle? and Lower Triassic) Th, 52, Horse Spring Formation, undivided (Miocene) Thb, 268, Basalt unit of Horse Spring Formation (Miocene) Tm, 45, Muddy Creek Formation (Pliocene and upper Miocene) Tmd, 46, Mount Davis Volcanics (Miocene) Tpm, 52, Patsy Mine Volcanics (Miocene) Xg, 132, Gneiss (Early Proterozoic) Zj, 134, Johnnie Formation (Late Proterozoic) Zs, 84, Stirling Quartzite (Late Proterozoic) ************************************************************* >>LV_GEOL.AAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 LV_GEOL# 4 5 B - - 29 LV_GEOL-ID 4 5 B - - 33 DESCRIPTION 100 100 C - - USER DEFINED ITEM DESCRIPTIONS: DESCRIPTION - Description of line features, using digital cartographic standards USER DEFINED ITEM VALUES: DESCRIPTION ----------------- contact- approximately located contact- certain contact- concealed high-angle fault- approximately located high-angle fault- certain low-angle fault- approximately located low-angle fault- certain map boundary thrust fault- approximately located thrust fault- certain ************************************************************* >>LV_FLT.AAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 LV_FLT# 4 5 B - - 29 LV_FLT-ID 4 5 B - - 33 DESCRIPTION 100 100 C - - USER DEFINED ITEM DESCRIPTIONS: DESCRIPTION - Description of line features, using digital cartographic standards USER DEFINED ITEM VALUES: DESCRIPTION ---------------- anticline- approximately located anticline- certain anticline- concealed fold axis- approximately located fold axis- certain fold axis- concealed high-angle fault- concealed high-angle fault- concealed (geophysical data) high-angle fault- concealed, queried low-angle fault- concealed low-angle fault- concealed, queried monocline- approximately located overturned anticline- approximately located overturned anticline- certain overturned anticline- concealed overturned syncline- approximately located overturned syncline- certain overturned syncline- concealed syncline- approximately located syncline- certain syncline- concealed thrust fault- concealed ************************************************************* >>LV_PNT.PAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 AREA 8 18 F 5 - 9 PERIMETER 8 18 F 5 - 17 LV_PNT# 4 5 B - - 21 LV_PNT-ID 4 5 B - - 25 DESCRIPTION 100 100 C - - 125 AZIMUTH 7 7 I - - 132 DIP 3 3 I - - USER DEFINED ITEM DESCRIPTIONS: DESCRIPTION - Description of point features, using digital cartographic standards AZIMUTH - Azimuth of strike or trend, in degrees clockwise from north (where applicable) DIP - Angle of dip or plunge, in degrees from horizontal (where applicable) USER DEFINED ITEM VALUES: DESCRIPTION ---------------- contact- showing dip fault- showing dip where known horizontal bedding inclined bedding- showing strike and dip inclined foliation- showing strike and dip overturned bedding- showing strike and dip sample location vertical bedding- showing strike AZIMUTH --------------- range of values: 0 - 359 DIP --------------- range of values: 0 - 90 ************************************************************* >>LV_SYM.AAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 LV_SYM# 4 5 B - - 29 LV_SYM-ID 4 5 B - - 33 DESCRIPTION 100 100 C - - USER DEFINED ITEM DESCRIPTIONS: DESCRIPTION - Description of line features, modified from digital cartographic standards USER DEFINED ITEM VALUES: DESCRIPTION ------------------ anticline symbol fault offset symbol- bar and ball fault offset symbol- left-lateral fault offset symbol- right-lateral fold plunge symbol high-angle fault- concealed low-angle fault- approximately located low-angle fault- concealed monocline symbol overturned anticline symbol overturned syncline symbol question mark sample location strike and dip symbol- bedding strike and dip symbol- bedding, horizontal strike and dip symbol- bedding, overturned strike and dip symbol- bedding, vertical strike and dip symbol- contact strike and dip symbol- fault strike and dip symbol- fault, no value strike and dip symbol- foliation syncline symbol thrust fault- approximately located thrust fault- certain thrust fault- concealed ************************************************************* >>LV_ISO.AAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 LV_ISO# 4 5 B - - 29 LV_ISO-ID 4 5 B - - USER DEFINED ITEM DESCRIPTIONS: no user defined items ************************************************************* >>LV_ISO-PNT.AAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 LV_ISO-PNT# 4 5 B - - 29 LV_ISO-PNT-ID 4 5 B - - 33 GROUP 25 25 C - - USER DEFINED ITEM DESCRIPTIONS: GROUP - age of isostatic gravity data recording (old set or new set) USER DEFINED ITEM VALUES: GROUP ------------- new old ************************************************************* >>LV_MAG.AAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 LV_MAG# 4 5 B - - 29 LV_MAG-ID 4 5 B - - USER DEFINED ITEM DESCRIPTIONS: no user defined items ************************************************************* >>LV_MAG.AAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 LV_MAG-MAX# 4 5 B - - 29 LV_MAG-MAX-ID 4 5 B - - USER DEFINED ITEM DESCRIPTIONS: no user defined items ************************************************************* >>LV_MAG-MAX.AAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 LV_MAG-MAX# 4 5 B - - 29 LV_MAG-MAX-ID 4 5 B - - USER DEFINED ITEM DESCRIPTIONS: no user defined items ************************************************************* >>LV_PROF.AAT<< COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 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 LV_PROF# 4 5 B - - 29 LV_PROF-ID 4 5 B - - 33 PROFILE 25 25 C - - USER DEFINED ITEM DESCRIPTIONS: PROFILE - name of profile line USER DEFINED ITEM VALUES: PROFILE -------------- A-A' B-B' C-C' ************************************************************* Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: Central Publications Group Address: Box 25046 Address: Denver Federal Center, MS-902 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Contact_Voice_Telephone: 303-236-5486 Distribution_Liability: 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 damage resulting from its authorized or unauthorized use. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARE, SHP Format_Version_Number: ArcInfo version 8.1 File_Decompression_Technique: .tar.gz - UNIX gzip-compressed TAR file - use GNU zip and TAR .zip - Windows ZIP archive - use WinZip, PKZip, or similar program to extract Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/sim/2005/2814 Fees: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U. S. Geological Survey Contact_Address: Address_Type: mailing address Address: USGS Information Services Address: Box 25046 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-888-ASK-USGS Resource_Description: I-2814 Distribution_Liability: None Standard_Order_Process: Non-digital_Form: Available as three printed sheets with one separate pamphlet. Order from USGS at the address listed above or see http://mapping.usgs.gov/esic/prices/ordering_info.html for more ordering information. Fees: For current prices of USGS information products, please see http://mapping.usgs.gov/esic/prices/. Metadata_Reference_Information: Metadata_Date: 2005 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jeremiah B. Workman Contact_Organization: U. S. Geological Survey Contact_Address: Address_Type: mailing address Address: Box 25046 Address: Denver Federal Center, MS-980 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-1257 Contact_Electronic_Mail_Address: jworkman@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Use_Constraints: none