Rose L. Medina 2004 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2004-5186_geol250 Nancy L. Alvarez Ralph L. Seiler 2004 document U.S. Geological Survey Scientific Investigations Report 2004-5186 Carson City, NV U.S. Geological Survey http://pubs.water.usgs.gov/sir2004-5186 This data set consists of digital continuous geologic data for the Carson River Basin, Nevada and California. It was compiled from individual county 1:250,000-scale geologic data for Pershing, Churchill, Lyon, Carson City, and Douglas Counties in Nevada and the Walker Lake 1 degree by 2 degree quadrangle geology. This data set contains detailed geologic formation and generalized geologic data. These data were created as part of a U.S. Geological Survey study, done in cooperation with the Carson Water Subconservancy District, to determine sources of phosphorus to the Carson River (Alvarez and Seiler, 2004). It was created to provide continuous geologic data for the Carson River Basin for use in spatial analysis. Cited Reference Alvarez, N.L., and Seiler, R.L., 2004, Sources of phosphorus to the Carson River upstream from Lahontan Reservoir, Nevada and California, Water Years 2001-02: U.S. Geological Survey Scientific Investigations Report 2004-5186, 80 p. 1969 1977 1974 1983 1991 1997 2003 publication date of the original work and the digital data Complete None planned -120.059674 -118.013183 40.285417 38.345763 none geologic data geology none Carson River Basin west-central Nevada east-central California Great Basin none Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology. Acknowledgment of the U.S. Geological Survey, Carson Water Subconservancy District, and Nevada Bureau of Mines and Geology would be appreciated in products derived from these data. U.S. Geological Survey Public Information Officer mailing and physical address

333 W. Nye Lane

Carson City NV 89706 USA (775) 887-7600 (775) 887-7629 GS-W-NVpublic-info@usgs.gov. Compilation of this data set and the associated metadata was done in cooperation with the Carson Water Subconservancy District. Technical review of this data set and metadata was provided by Susan G. Buto, U.S. Geological Survey and Marianne H. August, National Park Service. Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800 H.F. Bonham K.G. Papke 1969 map Bulletin 70 Reno, NV Nevada Bureau of Mines and Geology R.C. Greene J.H Stewart D.A. John R.F. Hardyman N.J. Silberling M.L. Sorensen 1991 map Miscellaneous Field Studies Map MF-2154-A Reston, VA U.S. Geological Survey M.G. Johnson 1977 map Bulletin 89 Reno, NV Nevada Bureau of Mines and Geology J.G. Moore 1969 map Bulletin 75 Reno, NV Nevada Bureau of Mines and Geology J.H. Stewart J.E. Carlson D.C. Johannesen 1983 map Miscellaneous Field Studies Map MF-1382-A Reston, VA U.S. Geological Survey R. Wilden R.C. Speed 1974 map Bulletin 83 Reno, NV Nevada Bureau of Mines and Geology R.H. Hess G.L. Johnson 1997 vector digital data Open-File Report 97-1 Reno, NV Nevada Bureau of Mines and Geology Rose L. Medina Deborah A. Dean 2004 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2004-5186_eff_p For each of the county geologic data sets, all attempts were made to compare 100 percent of the digital attribute data to the original source map. 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 99 percent of the digital attribute data matched the original source map and the data was used "as-is." For the Walker Lake quadrangle geology, all attempts were made to compare 100 percent of the digital attribute data to the original source map. 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 that no features were unlabeled, misspelled, or inconsistent. Corrections were made until two visual and manual comparisons, combined with on-screen review, determined 100 percent of the digital attribute data matched the original source map. The logical consistancy topologically is 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. Complete at 1:250,000-scale resolution for the Carson River Basin, Nevada and California. All attempts were made to compare 100 percent of the digital spatial data to the original source map. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots. For the county geologic data, one comparison determined 100 percent of the digital spatial data matched the original source map. For the Walker Lake quadrangle geology, corrections were made until two comparisons determined 100 percent of the digital spatial data matched the original source map. 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 1:250,000-scale map is approximately 127 meters according to the National Map Accuracy Standards of 1947. The horizontal positional accuracy was verified by visual and manual comparison as described in the Horizontal Positional Accuracy Report and the Process Steps and matches the positional accuracy of the original source map. 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, NV 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 M.G. Johnson 1977 map Bulletin 89 Reno, NV Nevada Bureau of Mines and Geology R.H. Hess G.L. Johnson 1997 vector digital data Open-File Report 96-4 Reno, NV Nevada Bureau of Mines and Geology 250000 CD-ROM 1997 publication date digital Pershing geology spatial and attribute information M.G. Johnson 1977 map Bulletin 89 Reno, NV Nevada Bureau of Mines and Geology 250000 paper 1977 publication date Pershing geology map spatial and attribute information J.G. Moore 1969 map Bulletin 75 Reno, NV Nevada Bureau of Mines and Geology R.H. Hess G.L. Johnson 1997 vector digital data Open-File Report 96-4 Reno, NV Nevada Bureau of Mines and Geology 250000 CD-ROM 1997 publication date digital LDC geology spatial and attribute information J.G. Moore 1969 map Bulletin 75 Reno, NV Nevada Bureau of Mines and Geology 250000 paper 1969 publication date LDC geology map spatial and attribute information J.H. Stewart 1983 map Miscellaneous Field Studies Map MAP MF-1382-A Reston, VA U.S. Geological Survey 250000 stable-base material 1983 publication date Walker geology map spatial and attribute information R. Wilden R.C. Speed 1974 map Bulletin 83 Reno, NV Nevada Bureau of Mines and Geology R.H. Hess G.L. Johnson 1997 vector digital data Open-File Report 96-4 Reno, NV Nevada Bureau of Mines and Geology 250000 CD-ROM 1997 publication date digital Churchill geology spatial and attribute information R. Wilden R.C. Speed 1974 map Bulletin 83 Reno, NV Nevada Bureau of Mines and Geology 250000 paper 1974 publication date Churchill geology map spatial and attribute information J.H. Stewart D.A. John R.F. Hardyman N.J. Silberling M.L. Sorensen 1991 map Miscellaneous Field Studies Map MAP MF-2154-A Reston, VA U.S. Geological Survey 250000 paper 1991 publication date Reno geology map spatial and atttribute information The Walker geology map was digitized to the Carson River Basin boundary. There was no information documenting the process. 1987-1991 All hard copy plots were produced using a 0.3 millimeter line width on translucent paper. 2000-2001 1. 1:250,000-scale hard copy plots of the digitized Walker geology map were generated using a light table. These plots were visually and manually compared with the Walker geology map. 2. Corrections were made to the spatial data until two visual and manual comparisons, 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. 3. 1:250,000-scale hard copy plots of the digital Washoe and Storey, Pershing, LDC, and Churchill Counties geology were generated. Using a light table, these plots were visually and manually compared with the Washoe and Storey, Pershing, LDC, and Churchill geology maps. 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. 200011-200012 1. A first round of 1:250,000-scale hard copy plots of the digitized Walker geology and county digital geology were generated and provided to Doug K. Maurer for grouping. 2. Maurer grouped the individual geologic formations into eight generalized groups. 3. The attributes GROUP and GROUP-DESC were added to each digital geology data set using the ArcInfo(R) ADDITEM command. 4. The attributes GROUP and GROUP-DESC were populated with the eight generalized groups using the ArcInfo(R) ARCEDIT module. 5. Attribute accuracy was verified by one visual and manual comparison, combined with on-screen review, of plots with Maurer's notes on the first round of plots. 20010122-20010126 1. A second round of 1:250,000-scale hard copy plots, focused on the county-line areas, were generated and provided to Maurer to resolve county-line discrepencies. 2. Maurer resolved the discrepencies using the county geology, Reno geology, and Walker geology maps. 3. The attributes MOD and MOD-COMMENT were added to the .AAT and .PAT using the ArcInfo(R) ADDITEM command. 4. Using the ArcInfo(R) ARCEDIT module, the individual county digital geologies and the digitized Walker geology were modifed to reflect Maurer's modifications to the county-line discrepencies. The changes were documented using the attributes MOD and MOD-COMMENT. 5. The changes were verified by visual and manual comparison, combined with on-screen review, of hard copy plots with Maurer's modifications on the second round of plots. 6. Using the ArcInfo(R) MAPJOIN command, the individual digital county geology and the digitized Walker geology were combined into one ArcInfo coverage. 7. Using the ArcInfo(R) ARCEDIT module, sliver polygons, overlapping polygons, and other errors resulting from the combination were cleaned. 8. Polygon and line topology was built using the ArcInfo(R) CLEAN command with the fuzzy tolerance = 0.001 and dangle = 0.01. 20010131-20010201 1. A third round of 1:250,000-scale hard copy plots, focused on the county-line areas, were generated and provided to Maurer to review the digital modifications. 2. Maurer approved of the digital modifications. 20010131-20010201 1. Using the ArcInfo(R) commands and the ArcEdit module, including the command LABELERRORS 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(R) CENTROIDLABEL command, labels were centered within the respective polygon. 3. For polygons and lines, using ArcGIS(R) 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. 4. Polygon and line topology was built using the ArcInfo(R) CLEAN command with the fuzzy tolerance = 0.001 and dangle = 0.01. 200402 Metadata structured and validated using metadata tools, mp and cns, developed by Peter Schweitzer, U.S. Geological Survey. 20040602 Vector Complete chain 3990 Label point 1445 GT-polygon composed of chains 1445 Point 2275 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.001539 0.001539 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 geol250.aat arc attribute table ESRI 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 Whole numbers that are automatically generated. C_CODE The type of geologic contact symbol from the published map. Populated for county geology data (in Nevada) only. Walker quad geology data (in California) not populated. Nevada Bureau of Mines and Geology 1 Known contact 2 Inferred contact 3 Concealed contact 4 Queried contact 5 Other 6 Fault contact 99 Boundary C_TYPE Short description of the above listed C_CODE. Populated for county geology data (in Nevada) only. Walker quad geology data (in California) not populated. Nevada Bureau of Mines and Geology See Enumerated Domain Value Definitions for C_CODE MOD Whether an arc was modified for edgematching. User-defined Y Arc is modified from original source MOD-COMMENT Documents comment about the modification of arc. User-defined Verbose comments geol250.pat polygon attribute table ESRI 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 Whole numbers that are automatically generated. FMATN Geologic formation abbreviation Nevada Bureau of Mines and Geology and U.S. Geological Survey Abbreviated names L_NAME Geologic formation long name. Populated for county geology data (in Nevada) only. Walker quad geology data (in California) not populated. Nevada Bureau of Mines and Geology Names GROUP Generalized geologic group code User-defined 0 Water 1 Basin Fill Deposits 2 Tertiary Sedimentary Rocks 3 Basic Volcanic Rocks 4 Silicic Volcanic Rocks 5 Intrusive Igenous Rocks 6 Metasedimentary and Metavolcanic Rocks 7 Limestone and Calcareous Rocks GROUP-DESC Generalized geologic group description User-defined See Enumerated Domain Value Definitions for GROUP MOD Modification status User-defined Y Polygon is modified from original source MOD-COMMENT Documents comments about the modification User-defined Verbose comments >GEOL250.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 GEOL250# 4 5 B - > 21 GEOL250-ID 4 5 B - > 25 FMATN 6 6 C - > 31 L_NAME 50 50 C - > 81 GROUP 1 1 I - > 82 GROUP-DESC 50 50 C - > 132 MOD 1 1 C - > 133 MOD-COMMENT 100 100 C - FMATN is the geologic formation abbreviation. L_NAME is the geologic formation long name. Populated for county geology data (in Nevada) only. Walker quad geology data (in California) not populated. GROUP is the generalized geologic group code. GROUP-DESC is the generalized geologic group description. > GROUP GROUP-DESC > 0 = Water > 1 = Basin Fill Deposits > 2 = Tertiary Sedimentary Rocks > 3 = Basic Volcanic Rocks > 4 = Silicic Volcanic Rocks > 5 = Intrusive Igneous Rocks > 6 = Metasedimentary and Metavolcanic Rocks > 7 = Limestone and Calcareous Rocks MOD is the modification status. A value of 'Y' = modified. MOD-COMMENT documents comments about the modification. >GEOL250.AAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 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 C_CODE 2 2 I - > 35 C_TYPE 20 20 C - > 55 MOD 1 1 C - > 56 MOD-COMMENT 50 50 C - C_CODE contains the type of geologic contact symbol from the published map. Populated for county geology data (in Nevada) only. Walker quad geology data (in California) not populated. C_TYPE is a short description of the above listed C_CODE. Populated for county geology data (in Nevada) only. Walker quad geology data (in California) not populated. > C_CODE C_TYPE > 1 = Known contact > 2 = Inferred contact > 3 = Concealed contact > 4 = Queried contact > 5 = Other > 6 = Fault contact > 99 = Boundary MOD is the modification status. A value of 'Y' = modified. MOD-COMMENT documents comments about the modification. provided above U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir2004-5186_geol250 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 SDTS spatial and attribute information Winzip 1.16 MB http://water.usgs.gov/GIS/dsdl/sir2004-5186_geol250.sdts.zip Winzipped ARCE spatial and attribute information Winzip 1.63 MB http://water.usgs.gov/GIS/dsdl/sir2004-5186_geol250.e00.zip None. This dataset is provided by USGS as a public service. 20041122 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir2004-5186_geol250 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998