Susan G. Buto Douglas K. Maurer David L. Berger in press vector digital data Carson City, NV U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2004-5155_geol250 David L. Berger Douglas K. Maurer Thomas J. Lopes Keith J. Halford 2004 document Scientific Investigations Report 2004-5155 Carson City, NV U.S. Geological Survey http://pubs.water.usgs.gov/sir2004-5155 This dataset consists of digital geologic data for the Dry Valley Hydrographic area, Nevada and California. It was compiled from individual 1:250,000-scale geologic data for Washoe County, Nevada, 1:62,500-scale geologic data for the Chilcoot and Doyle 15' quadrangles in California and the results of field mapping within the study area in 2004. A revised geologic map was needed in the study area because the available published maps have large discrepancies between the reported geologic units along the state line. The 2004 field mapping was confined to an area approximately 2000 feet east and west of the California/Nevada state line and about 1.5 miles north and south of Dry Valley Creek. No attempt was made to resolve discrepancies between the published maps in the area outside of the designated mapping area. The discrepancies between geologic units in the previously published maps directly affect flow calculations used in the water budget for Dry Valley. The geologic unit involved in the greatest discrepancy is a non-welded rhyolitic tuff. Contacts between this unit and Quaternary basin-fill sediments were refined based on field mapping and sampling; and aerial photography. During mapping, low hills along the southern side of the valley floor 0.5 to 1.3 miles east of the state line mapped as Quaternary alluvium by previous efforts were recognized as non-welded rhyolitic tuff. In the locations described above, the non-welded tuff is distinguished by a lag deposit of yellow and red rhyolitic gravel at land surface. In the sub-surface, reached by digging, the tuff is weathered to a dense clay. Outcrops of the tuff with faint bedding planes were located in washes. Sample points, outcrops, and contacts between the tuff and unconsolidated sediments were located in the field using a handheld Garmin GPS unit (model GPS76). This data was created as part of a U.S. Geological Survey study done in cooperation with Washoe County, NV to determine a water budget for the Dry Valley Hydrographic area in Nevada. 1969 2000 1989 1997 2004 1956 publication date of the original work and the digital data Complete None planned -120.036502 -119.723631 40.069531 39.890238 none geologic data geology none Dry Valley west-central Nevada east-central California none The use of firm, trade, and 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. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in a nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology. Acknowledgment of the U.S. Geological Survey, Washoe County Nevada, California Geological Survey, and Nevada Bureau of Mines and Geology would be appreciated in products derived from these data. U.S. Geological Survey Susan G. Buto Physical Scientist mailing and physical address

333 W. Nye Lane

Carson City NV 89706 USA (775)887-7680 (775)887-7629 sbuto@usgs.gov This data set was prepared with the assistance of T.L.T Grose of the Colorado School of Mines who provided digital data and field review of geologic mapping procedures and results. Technical review of this data set and metadata was provided by Rose L. Medina, U.S. Geological Survey; and George Saucedo, California Geologic Survey. Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 8.3.0.800 H.F. Bonham K.G. Papke 1969 map Bulletin 70 Reno, NV Nevada Bureau of Mines and Geology T.L.T Grose M. Mergner 2000 map Open-file Report 2000-23 Sacramento, CA California Geological Survey T.L.T Grose D. L. Wagner G. J. Saucedo M. D. Medrano 1989 map Open-file Report 1989-31 Sacramento, CA California Geologic Survey R. H. Hess G. L. Johnson 1997 vector digital data Open-file Report 97-1 Reno, NV Nevada Bureau of Mines and Geology Hycon Aerial Surveys, Inc. 1956 Project No. 22502-569 Contract No. DA-49-018eng, lot BH, sheet NJ11-1, frames 631 and 632 Pasadena, CA Army Map Service All attempts were made to compare 100% of the digital attribute data to the original source map within the study area. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots. Frequency tests were run on the arc and polygon attributes to check for unlabeled, misspelled, or inconsistent feature labels. After one comparison, it was determined that in all cases 100% of the digital attribute data matched the original source maps within the study area. The logical consistency is topologically clean. Polygon and chain-node topology is present. Using ArcInfo commands and routines, all polygons were checked for closure, missing label points, multiple label points, sliver polygons, and duplicate features; all arcs were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Completed at 1:250,000-scale resolution for Dry Valley, Nevada and California All attempts were made to compare 100% of the digital spatial data to the source maps within the study area. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots. For all the data, one comparison determined 100% of the digital spatial data matched the original source map within the study area. 150 meters Errors resulting from the quality of the source map, the automation process, and the scale resolution can impact the accuracy of the data. The errors resulting from the quality of the source map and the automation process are unknown. The inherent error of a 1:62,500-scale map is approximately 32 meters and of a 1:250,000-scale map is approximately 127 meters according to the National Map accuracy Standards of 1947. The horizontal error achieved by combining products at these two scales is equivalent to the error of the 1:250,000-scale product. The horizontal positional accuracy was verified by visual and manual comparison as described in the Accuracy Report and the Process Steps and matches the positional accuracy of the original source map(s). The horizontal positional error is deductively estimated at 150 meters. H. F. Bonham K. G. Papke 1969 map Bulletin 70 Reno, NV Nevada Bureau of Mines and Geology R. H. Hess G. L. Johnson 1997 vector digital data Open-File Report 97-1 Reno, Nevada Nevada Bureau of Mines and Geology 250000 CD-ROM 1997 publication date digital Washoe and Storey geology spatial and attribute information H.F. Bonham J.K. Papke 1969 map Bulletin 70 Reno, NV Nevada Bureau of Mines and Geology 250000 paper 1969 publication date Washoe and Storey geology map spatial and attribute information T.L.T. Grose D. L. Wagner G. J. Saucedo M. D. Medrano 1989 map Open-file Report 1989-31 Sacramento, CA California Geologic Survey 62500 paper 1989 publication date Doyle 15-minute geology map spatial and attribute information T.L.T. Grose M. Mergner 2000 Open-file Report 2000-23 Sacramento, CA California Geological Survey 62500 paper 2000 publication date Chilcoot 15-minute geology map Spatial and attribute data The Chilcoot 15-minute geology map was digitized to the quadrangle boundaries. There was no information documenting the process. 2000 - 2004 The Doyle 15-minute geology map was digitized to the quadrangle boundaries. There was no information documenting the process 1987 - 2004 1. 1:62,500-scale hard copy plots of the digitized Chilcoot and Doyle 15-minute geology maps were generated. Using a light table, these plots were visually and manually compared with the paper Chilcoot and Doyle 15-minute geology maps within the study area boundary. One visual and manual comparison, combined with on-screen review, determined there was no light between the original and digital lines and the attribute data matched the original source map within the study area boundary. 2. 1:250,000-scale hard copy plots of the digital Washoe and Storey geology were generated. Using a light table, these plots were visually and manually compared with the Washoe and Storey geology map within the study area boundary. One visual and manual comparison, combined with on-screen review, determined there was no light between the original and digital lines and the attribute data matched the original source map within the study area boundary. 20040204 1. The 15-minute geology data sets were projected from UTM zone 10, units meters to UTM zone 11, units meters to match the digital Washoe and Storey geology using the ArcInfo command PROJECT. 2. Fault segments from the Chilcoot and Doyle 15-minute geology maps were deleted from the Chilcoot and Doyle digital data sets to better match the digital Washoe and Storey geology which contained no fault information. 3. The attributes L-CODE, L-TYPE, SOURCE, and COMMENTS were added to the arc attribute tables of the Chilcoot 15-minute geology data set, the Doyle 15-minute geology data set and the digital Washoe and Storey geology using the ArcInfo command ADDITEM. In all three data sets, the attribute L-TYPE was populated with information from the original data set using the ArcGIS ArcMap module and the original fields from the source data sets were deleted. The attributes from the source material were intentionally preserved. The source of the attribute definition was noted in the SOURCE and COMMENTS attributes which were populated using the ArcGIS ArcMap module. L-CODE was left unpopulated until further processing could be done. 4. The attributes GROUP and GROUP_DESC were added to the polygon attribute tables in all three data sets using the ArcInfo command ADDITEM. The attributes were populated with information from the original data sets using the ArcGIS ArcMap module and the original fields were deleted from the source datasets. 5. Both arcs and polygons from the digital Washoe and Storey geology and the digitized 15-minute California data were merged together using the ArcInfo APPEND command. 6. The appended data set was clipped to the boundary of the study area using the ArcInfo CLIP command and the line option to preserve arc attributes. The dataset was clipped a second time using the ArcInfo CLIP command and the poly option to preserve polygon attributes. 7. Label points from the clipped polygon data set were selected and copied to the clipped line data set using the ArcInfo ARCEDIT module command PUT. The same process was used to select and copy the study area boundary to the clipped arc data set. 8. Polygon and line topology was built using the ArcInfo CLEAN command with the dangle length = 0.01 and fuzzy tolerance = 0.001 9. Hard copy plots of the modified geology were produced to verify the positional accuracy of the data within the study area boundary. Using a light table, the plots were visually and manually compared with the paper originals. One visual and manual comparison determined that there was no light between the lines and that the data had retained positional accuracy during processing. 10. The attribute L-CODE was populated for all arcs in the data set. 11. The modified geology mapped by Berger and Maurer was hand drawn on a paper base map using GPS points collected in the field as a guide. The map was mounted to an Altek digitizing table and the data was digitized into the cleaned and verified data set using ArcInfo commands and the ArcEdit module. The RMS error during digitizing was 0.003. 12. The attributes L-TYPE, SOURCE and COMMENTS were populated for the new arcs using commands in the ArcInfo ARCEDIT module. 13. A hard copy plot of the digitized data was produced to verify the positional accuracy of the digitized data. Using a light table, the plot was visually and manually compared with the paper original. Two separate visual and manual comparisons, combined with on screen review, determined that there was no light between the original and digital lines and the attribute data matched the original source map. 20040212 - 20040309 1. A hard copy plot of the draft data set was provided to Douglas K. Maurer for interpretation. 2. Maurer interpreted the remapped geology and reclassified the existing geology into 6 formations. 3. Where indicated by Maurer, arcs were deleted where geologic units were reinterpreted and merged. The attributes GROUP and GROUP_DESC were populated with the 6 formation values using the ArcInfo ARCEDIT module. 4. Attribute accuracy was verified by one visual and manual comparison, combined with on-screen review, of hard copy plots with Maurer's notes. 20040311 - 20040312 1. Using ArcInfo commands and the ArcEdit module, including the command LABLEERRORS and the node error, arc dangle, and intersect environment, polygons were checked for closure, missing or multiple labels, sliver polygons, and duplicates. Arcs were checked for node errors, overshoots, undershoots, dangles, intersections and duplicates. 2. Using the ArcInfo CENTROIDLABEL command, labels were centered within the respective polygon. 3. For polygons and lines, using ArcGIS ArcMap module, the attribute geol250-id was calculated to be a unique sequential integer based on geol250#. The attributes were checked for unlabeled, misspelled, or inconsistent feature labels. 20040319 Vector Complete chain 298 Label point 61 GT-polygon composed of chains 61 Point 2262 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000190 0.000190 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 geol250.aat Arc Attribute Table Computed FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. FNODE# Internal node number for the beginning of an arc (from-node). ESRI Whole numbers that are automatically generated. TNODE# Internal node number for the end of an arc (to-node). ESRI Whole numbers that are automatically generated. LPOLY# Internal node number for the left polygon. ESRI Whole numbers that are automatically generated. RPOLY# Internal node number for the right polygon. ESRI Whole numbers that are automatically generated. LENGTH Length of feature in internal units. ESRI Positive real numbers that are automatically generated. GEOL250# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. GEOL250-ID User-defined feature number. ESRI Sequential unique whole numbers that are calculated from the attribute geol250#. L-CODE The type of contact or boundary represented by the arc User-defined 1 Contact, approximately located Chilcoot and Doyle 15-minute geology maps 2 Contact, certain Chilcoot and Doyle 15-minute geology maps, Berger and Maurer field mapping 3 Fault contact Digital Washoe and Storey Geology 4 Fault, approximately located Chilcoot and Doyle 15-minute California geology maps 5 Fault, certain Chilcoot and Doyle 15-minute California geology maps 6 Inferred contact Digital Washoe and Storey geology 7 Known contact Digital Washoe and Storey geology 8 Normal fault, approximately located Chilcoot and Doyle 15-minute California geology maps 9 Uncertain Berger and Maurer field mapping 88 Map boundary Chilcoot and Doyle 15-minute California geology maps, Digital Washoe and Storey geology 99 Buffer boundary Berger and Maurer L-TYPE Short description of the L-CODE described above User-defined Text SOURCE The original source of attribute L-TYPE User-defined Berger and Maurer bnd From 1:24000-scale hydrographic area boundary (unpublished), buffered by 1500 meters user-defined Berger and Maurer Field From field mapping spring of 2004 user-defined Grose, etal.; Chilcoot Chilcoot 15-minute geology map user-defined Grose, etal., Doyle Doyle 15-minute geology map user-defined NBMG OFR 97-1 Digital Washoe and Storey geology user-defined COMMENTS Comment about how the data was collected User-defined Text geol250.pat Polygon attribute table Computed FID Internal feature number ESRI Sequential unique whole numbers that are automatically generated Shape Feature geometry ESRI Coordinates defining the features AREA Area of feature in internal units squared ESRI Positive real numbers that are automatically generated PERIMETER Perimeter of feature in internal units ESRI Positive real numbers that are automatically generated GEOL250# Internal feature number ESRI Sequential unique whole numbers that are automatically generated GEOL250-ID User-defined feature number ESRI Sequential unique whole numbers that are calculated from the attribute geol250# GROUP Code referring to group of geologic units user-defined Kgd Granitic bedrock. Equivalent to Kgd of Bonham (1969), Kgd of Grose and Mergner (2000), and Kgr of Grose and others (1989). User-defined nodata Not mapped User-defined Qal Unconsolidated sediments of alluvial fans and colluvium. Equivalent to Qal of Bonham (1969), and Qa, Qc, and Qf of Grose and Mergner (2000). User-defined Qll Lake deposits of semiconsolidated sand, silt, and clay. Mapped only by Grose and Mergner (2000). User-defined Trt Welded to non-welded rhyolitic tuff of Hartford Hill Rhyolite. Equivalent to Trt of Bonham (1969), Tru of Grose and Mergner (2000), and Tvr and Td of Grose and others (1989). Assumed to be equivalent to small area of Thl of Grose and Mergner (2000). User-defined Tsv Basaltic and andesitic flows and breccias with interbedded diatomite, shale, tuffs and tuff breccias. Informally mapped as the Pyramid Sequence by Bonham (1969). Equivalent to Tsv of Bonham (1969), Tai and Ta by Grose and others (1989). Not mapped by Grose and Mergner (2000) User-defined GROUP_DESC Short description of the above listed GROUP user-defined Text >GEOL250.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 GEOL250# 4 5 B - - > 29 GEOL250-ID 4 5 B - - > 33 L-CODE 5 5 I - - > 38 L-TYPE 35 35 C - - > 73 SOURCE 25 25 C - - > 98 COMMENTS 60 60 C - - L-CODE contains the type of geologic contact L-TYPE is the short description of L-CODE > L-CODE L-TYPE > 1 = contact, approximately located > 2 = contact, certain > 3 = fault contact > 4 = fault, approximately located > 5 = fault, certain > 6 = inferred contact > 7 = known contact > 8 = normal fault, approximately located > 9 = uncertain > 88 = map boundary > 99 = study area boundary SOURCE is the source of the L-TYPE definition COMMENTS documents comments about arcs generated from Berger and Maurer field mapping >GEOL250.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 GEOL250# 4 5 B - - > 21 GEOL250-ID 4 5 B - - > 25 GROUP 6 6 C - - > 31 GROUP_DESC 110 110 C - - GROUP is a code referring to the grouped geologic formations GROUP_DESC is a short description of the GROUP > GROUP GROUP_DESC > Kgd = Granitic bedrock > Qal = Unconsolidated sediments of alluvial fans > and colluvium > Qll = Lake deposits of semiconsolidated sand, > silt and clay > Trt = Welded to non-welded rhyolitic tuff > Tsv = Basaltic and andesitic flows and breccias > with interbedded diatomite, shale, tuffs > and tuff breccias > nodata = Not mapped Nevada Bureau of Mines and Geology California Geologic Survey U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir2004-5155_geol250 Although this data set has 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 and related materials. 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 this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/sir2004-5155_geol250.zip SDTS Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/sir2004-5155_geol250sdts.zip None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir2004-5155_geol250 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998