Donald S. Sweetkind Jay R. Cederberg Susan G. Buto Melissa D. Masbruch 2011 Raster digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_3D_HGF Heilweil, V.M., editor Brooks, L.E., editor 2011 document U.S. Geological Survey Scientific Investigations Report SIR2010-5193 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2010/5193 This dataset was created in support of a study focusing on groundwater resources in the Great Basin carbonate and alluvial aquifer system (GBCAAS). The GBCAAS is a complex aquifer system comprised of both unconsolidated and bedrock formations covering an area of approximately 110,000 square miles. The aquifer system is situated in the eastern portion of the Great Basin Province of the western United States. The eastern Great Basin is experiencing rapid population growth and has some of the highest per capita water use in the Nation. These factors, combined with the arid setting, have levied intensive demand upon current groundwater resources and, thus, predictions of future shortages. Because of the large regional extent of the aquifer system, rapid growth in the region, and the reliance upon groundwater for urban populations, agriculture, and native habitats, the GBCAAS was selected by the U.S. Geological Survey (USGS) Water Resources program as part of the National Water Census Initiative to evaluate the Nation's groundwater availability. The complex stratigraphic and structural framework of the GBCAAS region controls groundwater flow throughout the region. A three-dimensional (3D) hydrogeologic framework was constructed to represent the hydrogeologic units and major structures in the region to aid in the development of both the conceptual and numerical groundwater-flow models of the study area. The 3D hydrogeologic framework was constructed by extracting and combining information from digital elevation models, geologic maps, borehole lithologic logs, geologic cross sections, and digital geophysical models. This dataset is composed of nine raster layers: 1. ubfau_top - Altitude of the top of the upper basin-fill aquifer unit in meters above North American vertical datum of 1988. 2. lbfau_top - Altitude of the top of the lower basin-fill aquifer unit in meters above North American vertical datum of 1988. 3. vu_top - Altitude of the top of the volcanic unit in meters above North American vertical datum of 1988. 4. ucau_top - Altitude of the top of the upper carbonate aquifer unit in meters above North American vertical datum of 1988. 5. uscu_top - Altitude of the top of the upper siliciclastic confining unit in meters above North American vertical datum of 1988. 6. tlcau_top - Altitude of the top of the thrusted lower carbonate aquifer unit in meters above North American vertical datum of 1988. 7. lcau_top - Altitude of the top of the lower carbonate aquifer unit in meters above North American vertical datum of 1988. 8. tnccu_top - Altitude of the top of the thrusted noncarbonate confining unit in meters above North American vertical datum of 1988. 9. nccu_top - Altitude of the top of the noncarbonate confining unit in meters above North American vertical datum of 1988. This dataset was created to support hydrologic investigations in the Great Basin Physiographic Province. The intended uses of this dataset include, but are not limited to, natural resource modeling, mapping, and visualization applications. 2011 publication date Complete None planned -118.647225 -110.972686 42.561624 35.168005 ISO 19115 topic category inlandWaters geoscientificInformation none Geologic Units Geology none Great Basin Utah Nevada Idaho California GCMD Science Keywords Bedrock Lithology Igneous Rocks Metamorphic Rocks Sedimentary Rocks None. This data set is provided by USGS as a public service. Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, this metadata file may include some ArcGIS-specific terminology. These data are not intended to be used as a survey product and are for reference only. U.S. Geological Survey Utah Water Science Center Center Director mailing and physical address

2329 Orton Circle

Salt Lake City UT 84119 USA (801)908-5000 (801)908-5001 sbuto@usgs.gov http://water.usgs.gov/GIS/browse/sir2010_5193_3D_HGF.jpg Illlustration of data set jpg Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Technical review of this database was done by Shana L. Mashburn, USGS Oklahoma Water Science Center and Toby L. Welborn, USGS Nevada Water Science Center. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.4.1420 Buto, S.G. Sweetkind, D.S. 2011 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_ha1000 Heilweil, V.M., editor Brooks, L.E., editor 2011 document U.S. Geological Survey Scientific Investigations Report SIR2010-5193 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2010/5193 Brooks, L.E. Masbruch, M.M. Buto, S.G. 2011 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_GWdisch1000 Heilweil, V.M., editor Brooks, L.E., editor 2011 document U.S. Geological Survey Scientific Investigations Report SIR2010-5193 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2010/5193 Masbruch, M.M. Buto, S.G. 2011 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_potentiometric1000 Heilweil, V.M., editor Brooks, L.E., editor 2011 document U.S. Geological Survey Scientific Investigations Report SIR2010-5193 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2010/5193 Alan L. Flint Lorraine E. Flint 2011 raster digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2010_5193_BCM Heilweil, V.M., editor Brooks, L.E., editor 2011 document U.S. Geological Survey Scientific Investigations Report SIR2010-5193 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2010/5193 The attribute "value" is the modeled altitude of the top of each geologic unit. Attribute accuracy is dependant on model output. Detailed descriptions and analysis for these data is available in Appendix 1 of the Conceptual model of the Great Basin carbonate and alluvial aquifer system (see larger work citation for details) Tests of valid values were performed throughout processing. All areas are completely described. Complete for the eastern Great Basin. This dataset is the result of raster calculation and interpolation using multiple data sources with varying scales, quality, and accuracy. Detailed descriptions and analysis for these data is available in Appendix 1 of the Conceptual model of the Great Basin carbonate and alluvial aquifer system (see larger work citation for details) 1000 meters Errors resulting from the quality of the source maps, the automation processes, and the scale resolution can impact the accuracy of the data. Errors resulting from the quality of the source map and automation processes are unknown. Horizontal positional accuracy is deductively estimated at 1000 meters. This dataset represents the modeled altitude of the top of hydrogelogic formations in the GBCAAS study area. The data were derived from raster calculation and interpolation using multiple data sources with varying scales, quality, and accuracy. 100 meters The vertical accuracy varies spatially and is dependant on the data source and performance of the interpolator used. Vertical accuracy of the data is estimated as 100 meters. Heilweil, V.M., editor Brooks, L.E., editor 2011 U.S. Geological Survey Scientific Investigations Report SIR2010-5193 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2010/5193 online 2011 publication date gbcaas appendix 1 Source refers to detailed description of hydrogeologic framework inputs and data processing The 3D Hydrogeologic Framework for the GBCAAS study area was constructed by compiling elevation models, geologic cross sections, borehole stratigraphic logs, digital geologic maps, geophysical surveys, and geologic maps of varying scales. Detailed descriptions and analysis for these data is available in Appendix 1 of the Conceptual model of the Great Basin carbonate and alluvial aquifer system (see larger work citation for details). gbcaas appendix 1 2008 GBCAAS 3D HGF Vector G-polygon 265 String 793 Albers Conical Equal Area 29.500000 45.500000 -114.000000 23.000000 0.000000 0.000000 coordinate pair 0.000167 0.000167 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 0.000100 meters Explicit elevation coordinate included with horizontal coordinates sir20105193_lbfau_top Top of the lower basin-fill aquifer unit User defined ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Altitude of the top of the lower basin-fill aquifer unit User defined -6694 4070 meters COUNT number of raster cells with VALUE ESRI Whole numbers that are automatically generated. sir20105193_ubfau_top Top of the upper basin-fill aquifer unit User defined ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Altitude of the top of the upper basin-fill aquifer unit User defined -81 4070 meters COUNT number of raster cells with VALUE ESRI Whole numbers that are automatically generated. sir20105193_vu_top Top of the volcanic unit User defined ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Altitude to the top of the volcanic unit User defined -10349 4070 meters COUNT number of raster cells with VALUE ESRI Whole numbers that are automatically generated. sir20105193_tlcau_top Top of the thrusted lower carbonate aquifer unit User defined ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Altitude of the top of the thrusted lower carbonate aquifer unit User defined -10349 4025 meters COUNT number of raster cells with VALUE ESRI Whole numbers that are automatically generated. sir20105193_lcau_top Top of the lower carbonate aquifer unit User defined ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Altitude of the top of the lower carbonate aquifer unit User defined -10349 3993 meters COUNT number of raster cells with VALUE ESRI Whole numbers that are automatically generated. sir20105193_tnccu_top Top of the thrusted noncarbonate confining unit User defined ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Altitude of the top of the thrusted noncarbonate confining unit User defined -10349 4025 meters COUNT number of raster cells with VALUE ESRI Whole numbers that are automatically generated. sir20105193_nccu_top Top of the noncarbonate confining unit User defined ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Altitude of the top of the noncarbonate confining unit User defined -10349 3993 meters COUNT number of raster cells with VALUE ESRI Whole numbers that are automatically generated. sir20105193_ucau_top Top of the upper carbonate aquifer unit User defined ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Altitude of the top of the upper carbonate aquifer unit User defined -10349 4025 meters COUNT number of raster cells with VALUE ESRI Whole numbers that are automatically generated. sir20105193_uscu_top Top of the upper siliciclastic confining unit User defined ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Altitude of the top of the upper siliciclastic confining unit User defined -10349 3993 meters COUNT number of raster cells with VALUE ESRI Whole numbers that are automatically generated. U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+SIR2010_5193_3D_HGF Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. WinZipped file geodatabase 9.2 ESRI 9.2 File geodatabase Spatial and attribute information http://water.usgs.gov/GIS/dsdl/SIR2010_5193_3D_HGF.gdb.zip WinZipped ASCII grids 07252011 ASCII grid Spatial and attribute information http://water.usgs.gov/GIS/dsdl/SIR2010_5193_3D_HGF.ascii.zip None. This data set is provided by USGS as a public service. 20081104 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998