Clawges, Rick Price, Curtis 1999 1.0 map Open-File Report 99-77 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr99-77_geol75m This digital data set describes surficial geology of the conterminous United States. The data set was generated from a U.S. Geological Survey 1:7,500,000-scale map of surficial geology published as part of the U.S. Geological Survey National Atlas map series. This data set is a generalized representation of surficial geology in the conterminous United States and was created for use in the analysis of ground-water quality data on volatile organic compounds (VOCs) by the U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) VOC National Synthesis Team. The source map for this data set is a map of surficial geology published as part of the U.S. Geological Survey National Atlas map series (Hunt, 1979) Coastlines and political boundaries are modified from a digital version of U.S. Geological Survey 1:2,000,000 county boundaries (USGS, 1984). REVIEWS This electronic report was subjected to the same review standard that applies to all U.S. Geological Survey reports. Reviewers were asked to check the topological consistency, tolerances, attribute frequencies and statistics, projection, and geographic extent. The reviewers checked the metadata and a_readme.1st files for completeness and accuracy. REFERENCES Environmental Systems Research Institute, Inc. (ESRI), 1997, Arc/INFO 7.1.1 Help, Redlands, California, [on-line documentation]. Hunt, Charles D., 1979, National Atlas of the United States of America--Surficial Geology: U.S. Geological Survey, NAC-P-0204-75M-O, [map]. Lanfear, K.J., 1984, Digital map of counties and county equivalents in the conterminous United States: U.S. Geological Survey data available on the World Wide Web, accessed July 21, 1998, at URL http://water.usgs.gov/lookup/getspatial?county2m NOTES Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 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. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology. 1979 The data is based on the a map by Hunt (1979). Complete None planned. -127.87106262 -65.35692717 48.2441996 22.87753347 None surficial geology inlandWaters None Conterminous 48 United States None None Curtis V. Price U.S. Geological Survey Physical Scientist mailing address

1608 Mountain View Rd

Rapid City South Dakota 57702 United States of America 1-888-275-8747 (605) 355-4523 cprice@usgs.gov none Compilation of the data sets was supported by the National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey. The objectives of the NAWQA Program are to: (1) describe current water-quality conditions for a large part of the Nation's freshwater streams, rivers, and aquifers, (2) describe how water quality is changing over time, and (3) improve the understanding of the primary natural and anthropogenic factors that affect water-quality conditions. National analysis of data, based on aggregation of comparable information obtained from across the United States, is a major component of the NAWQA Program. These data sets were created in support of NAWQA national data analysis activities. Public Unclassified None Operating System: dgux, 5.4R3.10, AviioN UNIX, ARC/INFO version 7.1.1 Polygon topology present. This data set includes all of the surficial geology boundaries presented in Hunt (1979). The linework was plotted on mylar and checked against the original separate on a light table. All linework matched within 1 millimeter. No tests performed, except a visual check to see how well the data set lines corresponded to those on the paper map. Charles B. Hunt, U.S. Geological Survey 1979 map Reston, VA U.S. Geological Survey 7500000 mylar 1979 publication date none geology boundaries and geology polygon attributes Lanfear, K.J. 19840816 map Reston, Virginia, USA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr99-77_geol75m online 19840816 as of 1983 county2m US boundary and coastlines Original source material was a mylar separate of surficial geology boundaries and tics provided by James Witmer of the U.S. Geological Survey in Reston, Virginia. The mylar separate then was scanned to create a two-color tiff file at U.S. Geological Survey GIS laboratory in Denver, Colorado. Details of the scanning procedure follow: ascan Version 7.2 - 16-Dec-1992 V6000(SCSI) output file = geology.tif creation date = 25-Jan-96 11:47:20 density = 400 pixels / inch x (in) = 1.000 28.000 y (in) = 3.000 21.000 output file x pixel limits = 1 10800 output file y pixel limits = 1 7200 speed = 100 % scan line orientation = 4 (top left horizontal) output file size = 9720512 bytes scan time = 112 seconds sensitivity = 155 10 0 min width = 0.000 bi-level compression type 1 (uncompressed) ARC/INFO software and commands (ESRI, 1997) then were used to convert the image file to a coverage. ARC/INFO commands and modules are shown below in capitals. Step 1. Convert image to a grid using IMAGEGRID command. Step 2. Convert from raster to vector using GRIDLINE command and the following tolerances: thickness = .018, dangle = .01 and weed = .002. Step 3. Set tolerances for the coverage to the following: fuzzy = .002, dangle = .002, nodesnap = .01, weed = .002, and tic_match = .005. Step 4. Remove extraneous arcs from coverage including tic marks and legend lines from scanned image. Step 5. Transform coverage to Albers coordinates: Scale (X,Y)=(190422.687,190730.033) Skew (degrees)=(0.039) Rotation (degrees)=(-0.019) Translation=(-2508905.057,3384430.027) RMS Error (input,output)=(0.002,313.795) Affine X = Ax + By + C Y = Dx + Ey + F A = 190422.677 B = 192.898 C = -2508905.057 D = -63.547 E = 190729.979 F = 3384430.027 tic id input x input y output x output y x error y error ------ -------------- -------------- ------------ ------------ 1 1.170 -12.186 -2288722.374 1059890.036 251.885 144.651 2 1.370 -3.110 -2248342.323 2791386.719 -276.145 -158.583 3 19.767 -4.360 1253984.253 2551463.021 291.588 167.451 4 21.248 -13.026 1534880.079 898857.189 -267.328 -153.520 Step 6. Added United States boundary using coverage /home/vocgis/lib/pol/stategen, which is a generalized version of county2m coverage. Step 7. Clean up any intersect error or dangles. Step 8. Build topology. Step 9. Create labels and rebuild. Step 10. Assign attribute data to polygons. Step 11. Mylar plots were made to check linework against original separate. 19960619 Step 12. Used UNSPLIT in Arcedit to remove unnecessary pseudo nodes. Step 13. Rebuild topolgy Step 14. Copied coverage from DOUBLE to SINGLE precision and CLEANed. Used fuzzy tolerance of 0.920 and dangle length of 0.002. Step 15. Used RENODE to sequentially number nodes. 19981028 Vector Point 2514 String 4815 GT-polygon composed of chains 2515 Albers Conical Equal Area 29.5 45.5 -96 23 0.00000 0.00000 coordinate pair 0.92 0.92 METERS North American Datum of 1927 Clarke 1866 6378206.4 294.98 There is a polygon attribute table associated with this file: GEOL75M.PAT: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 8 18 F 5 9 PERIMETER 8 18 F 5 17 GEOL75M# 4 5 B - 21 GEOL75M-ID 4 5 B - 25 GEOUNIT 9 9 C - 34 CODE 2 2 I - 36 SYMBOL 4 5 B - AREA is the area of the polygon in square meters PERIMETER is the perimeter of the polygon in meters GEOL75M# is a program-generated feature identity number GEOL75M-ID is a user-assigned feature identity number GEOUNIT is the code for geologic unit from Hunt (1979): si Sea islands cr Coral bm Backshore deposits pW Pre-Wisconsinan drift tg Till, or ground moraine ts Ice-laid deposits, like tg but mostly sand and silt ts/K,T Thin ice-laid deposits, like ts but thin and discontinuous. Extensive exposure of underlying Cretaceous- and Tertiary-age formations mg Deposits of mountain glaciers w Gravel, sand and clay deposited by glacial streams adjacent to or downstream from temporary ice fronts al Floodplain and alluvium gravel terraces fg Fan gravels fs Fan sands osg Pliocene-age and older stream deposits on the Great Plains l Lake deposits s Sand sheets, mostly with dunes or sand mounds at surface s/osg Sand sheets on sandy and gravelly Ogallala Formation in southern Great Plains wl Wisconsinan loess es Deeply weathered loess b Basalt br Bedrock rsh Micaceous residuum without much quartz; clay, mostly kaolinite rgr Residuum with abundant quartz; much less mica than rsh, but equal to clay rga Clay residuum with little mica or quartz; mostly massive kaolinitic clay rls Red clay, massive clay that is generally kaolinitic rlc Cherty red clay; similar to rls, but with chert from the parent rock rtr Residuum on Triassic-age formations; depths less than most other saprolite, reddish color, largely inherited from from parent rock rs Sandy residuum, derived by intensive weathering of sandstone formations. Sand locally is in dunes rc Clay residuum that swells when wet; developed by weathering of poorly consolidated shale, containing the clay mineral montmorillonite, generally less than 10 feet rl Loam; texture variable, ranging from sand to clay, mostly non-swelling clay mineral, kaolinite; otherwise similar to rc rg Intensively weathered upper Tertiary- and Quaternary-age gravels; thickness generally less than 30 feet, distribution not completely known rph Phosphatic clay; poorly sorted clay and phosphate pebbles or nodules in sandy matrix. Thickness 10 to 50 feet, commonly overlain by loose sand. Major source of phosphate fertilizer rsi Sandy or silty residuum; probably includes loess. Depth generally less than 10 feet ls Silt on limestone; probably includes considerable loess; extensive bare rock ss Sandy ground; mostly on poorly consolidated sandstone formations sh Shaley or sandy ground; on mixed sandstone and shale formations; where shaley, contains considerable swelling clay gyp Sandy gypsiferous ground; many sinks, local dunes; vegetation scanty or lacking where there is much gypsum or other salt c Clayey ground on weathered Permian- and/or Triassic-age red beds m Marshes, swamps, peat deposits; only locally thicker than 12 feet gp Sandy coastal ground with organic layer over a shallow water table, ground water podsols co/ss,sh Sandy and stony colluvium derived mostly from sandstone and shale co/ls Stony colluvium on limestone; considerable admixed silt, possibly of loess origin co/m Stony colluvium on metamorphic rocks; less silt and clay than in co/ls co/v Colluvium on volcanic rocks co/gr Bouldery and sandy colluvium on granitic rocks co/c Clayey and loamy colluvium; on poorly consolidated rocks on lee sides of Pacific Coast Ranges CODE is an assigned geologic unit number ranging from 1 to 45. SYMBOL is an assigned number for shading symbol that can be used with the SHADESET COLORNAMES and the POLYGONSHADES command in ARC/INFO's ARCPLOT module. none U.S. Geological Survey Ask USGS - Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html 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/ofr99-77_geol75m.e00.gz http://water.usgs.gov/GIS/dsdl/ofr99-77_geol75m.e00.zip DLG Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-77_geol75m.dlg.tgz http://water.usgs.gov/GIS/dsdl/ofr99-77_geol75m.dlg.zip SDTS Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/ofr99-77_geol75m.sdts.tgz http://water.usgs.gov/GIS/dsdl/ofr99-77_geol75m.sdts.zip None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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+ofr99-77_geol75m FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998