## Di g ital data set describin g surficial g eolo g y in the conterminous US

I dentification Information: Citation: Citation Information: Originator: Clawges, Rick Originator: Price, Curtis Publication Date: 1999 Title: Digital data set describing surficial geology in the conterminous US Edition: 1.0 Geospatial Data Presentation Form: map Series Information: Series Name: Open-File Report Issue Identification: 99-77 Publication Information: Publication Place: Rapid City, SD Publisher: U.S. Geological Survey Online Linkage: http://water.usgs.gov/lookup/getspatial?ofr99

- 77_geol75m Description: Abstract: 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. Purpose: 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-Qual ity Assessment Program (NAW QA) VOC National Synthesis Team. Supplemental Information: The source map for this data set is a map of surficial geology published as part of the U.S. Geo logical 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 statisti cs, projection, and geographic extent. The reviewers checked the metadata and a_re adme.1st files for completeness and accuracy. REFERENCES Environ mental Systems Research In stitute, Inc. (ESRI), 1997, Arc/INFO 7.1.1 Help, Redlands , California, [on-line documentation]. Hunt, Charles D., 1979, National Atlas of the Unit ed States of America--Surfi cial Geology: U.S. Geological Survey, NAC-P-0204-75M-O, [map]. Lanfear, K.J., 1984, Digital map of counties and 

### Pa g e 1 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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...county equivalents in the conterminous Un ited 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 descript ive purposes only and does not imply endorsement by the U.S. Government. Although this data set ha s 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 th e data and related materials. The act of distribution shall not constitute any such wa rranty, and no responsibility is assumed by the U.S. Geological Survey in the use of th is data, software, or related materials. Although this Federal Geographic Data Committ ee-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. Time Period of Content: Time Period Information: Single Date/Time: Calendar Date: 1979 Currentness Reference: The data is based on the a map by Hunt (1979). Status: Progress: Complete Maintenance and Update Frequency: None planned. Spatial Domain: Bounding Coordinates: West Bounding Coordinate: -127.87106262 East Bounding Coordinate: -65.35692717 North Bounding Coordinate: 48.2441996 South Bounding Coordinate: 22.87753347 Keywords: Theme: Theme Keyword Thesaurus: None Theme Keyword: surficial Theme Keyword: geology Theme Keyword: inlandWaters Place: Place Keyword Thesaurus: None Place Keyword: Conterminous 48 United States Access Constraints: None Use Constraints: None Point of Contact: Contact Information: Contact Person Primary: Contact Person: Curtis V. Price Contact Organization: U.S. Geological Survey 

### Pa g e 2 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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...Contact Position: Physical Scientist Contact Address: Address Type: mailing address Address: 1608 Mountain View Rd City: Rapid City State or Province: South Dakota Postal Code: 57702 Country: United States of America Contact Voice Telephone: 1-888-275-8747 Contact Facsimile Telephone: (605) 355-4523 Contact Electronic Mail Address: cprice@usgs.gov Contact Instructions: none Data Set Credit: Compilation of the data sets was supported by the National Water-Quality Assessment (NAWQA) Program of the U.S. Geolo gical 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, an d aquifers, (2) describe how wa ter quality is changing over time, and (3) improve the understanding of th e primary natural and anthropogenic factors that affect water-quality conditions. National analysis of data, based on aggregation of comparable information obtained from across th e United States, is a major component of the NAWQA Program. These data sets were created in support of NAWQA national data analysis activities. Security Information: Security Classification System: Public Security Classification: Unclassified Security Handling Description: None Native Data Set Environment: Operating System: dgux, 5.4R 3.10, AviioN UNIX, ARC/INFO version 7.1.1

Data Quality Information: Logical Consistency Report: Polygon topology present. Completeness Report: This data set includes all of the surficial geology boundaries presented in Hunt (1979). Positional Accuracy: Horizontal Positional Accuracy: Horizontal Positional Accuracy Report: The linework was plotted on mylar and checked against the original separate on a light table. All linework matched within 1 millimeter. Vertical Positional Accuracy: Vertical Positional Accuracy Report: No tests performed, except a visual check to see how well the data set linescorresponded to those on the paper map. Lineage: Source Information: 

### Pa g e 3 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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...Source Citation: Citation Information: Originator: Charles B. Hunt, U.S. Geological Survey Publication Date: 1979 Title: The National Atlas of the United States of America: Surficial geology Geospatial Data Presentation Form: map Publication Information: Publication Place: Reston, VA Publisher: U.S. Geological Survey Source Scale Denominator: 7500000 Type of Source Media: mylar Source Time Period of Content: Time Period Information: Single Date/Time: Calendar Date: 1979 Source Currentness Reference: publication date Source Citation Abbreviation: none Source Contribution: geology boundaries and geol ogy polygon attributes Source Information: Source Citation: Citation Information: Originator: Lanfear, K.J. Publication Date: 19840816 Title: Counties and county equivalent s in the conterminous United States Geospatial Data Presentation Form: map Publication Information: Publication Place: Reston, Virginia, USA Publisher: U.S. Geological Survey Online Linkage: http://water.usgs.gov/lookup/getspatial?ofr99

- 77_geol75m Type of Source Media: online Source Time Period of Content: Time Period Information: Single Date/Time: Calendar Date: 19840816 Source Currentness Reference: as of 1983 Source Citation Abbreviation: county2m Source Contribution: US boundary and coastlines Process Step: Process Description: Original source material was a mylar separate of surficial 

### Pa g e 4 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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...geology boundaries and tics provided by James Witmer of the U.S. Geological Survey in Reston, Virginia. The mylar sepa rate then was scanned to create a twocolor tiff file at U.S. Geological Surv ey GIS laboratory in Denver, Colorado. Details of the scanning procedure foll ow: ascan Version 7.2 - 16-Dec-1992 V6000 (SCSI) output file = geology.tif crea tion date = 25-Jan-96 11:47:20 density = 400 pixels / inch x (in) = 1.000 28.000 y (i n) = 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 si ze = 9720512 bytes scan time = 112 seconds sensitivity = 155 10 0 min wi dth = 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: th ickness = .018, dangle = .01 and weed = .002. Step 3. Set tolerances for the coverage to th e following: fuzzy = .002, dangle = .002, nodesnap = .01, weed = .002, and tic_match = .005. Step 4. Remove extraneous arcs from coverage includin g 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/li b/pol/stategen, which is a generalized version of county2m coverage. Step 7. Cl ean 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. My lar plots were made to check linework against original separate. Process Date: 19960619 Process Step: Process Description: Step 12. Used UNSPLIT in Ar cedit to remove unnecessary pseudo nodes. Step 13. Rebuild topolgy Step 14. Copied coverage from DOUBLE to SINGLE precision and CLEANed. Used fu zzy tolerance of 0.920 and dangle length of 0.002. Step 15. Used RENO DE to sequentially number nodes. Process Date: 19981028

Spatial Data Organi zation Information: Direct Spatial Reference Method: Vector 

### Pa g e 5 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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...Point and Vector Object Information: SDTS Terms Description: SDTS Point and Vect or Object Type: Point Point and Vector Object Count: 2514 SDTS Terms Description: SDTS Point and Vect or Object Type: String Point and Vector Object Count: 4815 SDTS Terms Description: SDTS Point and Vect or Object Type: GT-polygon composed of chains Point and Vector Object Count: 2515

Spatial Reference Information: Horizontal Coordinate System Definition: Planar: Map Projection: Map Projection Name: Albers Conical Equal Area Albers Conical Equal Area: Standard Parallel: 29.5 Standard Parallel: 45.5 Longitude of Central Meridian: -96 Latitude of Projection Origin: 23 False Easting: 0.00000 False Northing: 0.00000 Planar Coordinate Information: Planar Coordinate Encoding Method: coordinate pair Coordinate Representation: Abscissa Resolution: 0.92 Ordinate Resolution: 0.92 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: 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 metersGEOL75M# is a program-generated feature identity number GEOL75M-ID is a user

### Pa g e 6 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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...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 icelaid deposits, like ts but thin and discont inuous. 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 grav el 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 wi thout much quartz; clay, mostly kaolinite rgr Residuum with abun dant 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 ka olinitic rlc Cherty red clay; similar to rls, but with chert from the parent rock rtr Re siduum on Triassic-age formations; depths less than most other saprolite, reddish color, largely inherited from from parent rock rs Sandy residuum, derived by intensive weathe ring of sandstone formations. Sand locally is in dunes rc Clay residuum that swells wh en wet; developed by weathering of poorly consolidated shale, containing the clay mineral montmorillonite, generally less than 10 feet rl Loam; texture variable, ranging fr om sand to clay, mostly non-swelling clay mineral, kaolinite; otherwise similar to rc rg Intensively weathere d upper Tertiary- and Quaternary-age gravels; thickness generally less than 30 feet, distribution not completely known rph Phosphatic clay; poor ly 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 ro ck ss Sandy ground; mostly on poorly consolidated sandstone formations sh Shal ey or sandy ground; on mixed sandstone and shale formations; where shaley, contains considerable swelling clay gyp Sandy gypsiferous ground; many sink s, local dunes; vegetation scanty or lacking where there is much gypsum or other salt c Clayey gr ound on weathered Permian- and/or Triassicage red beds m Marshes, swamps, peat deposi ts; only locally thicker than 12 feet gp Sandy coastal ground with organic layer ov er a shallow water table, ground water podsols co/ss,sh Sandy and st ony 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 consolid ated 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 th at can be used with the SHADESET COLORNAMES and the POLYGONSHADES comma nd in ARC/INFO's ARCPLOT module. Entity and Attribute Detail Citation: none 

### Pa g e 7 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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...Distribution Information: Distributor: Contact Information: Contact Organization Primary: Contact Organization: U.S. Geological Survey Contact Position: Ask USGS - Water Webserver Team Contact Address: Address Type: mailing Address: 445 National Center City: Reston State or Province: VA Postal Code: 20192 Contact Voice Telephone: 1-888-275-8747 (1-888-ASK-USGS) Contact Electronic Mail Address: http://water.usgs.gov/user_feedback_form.html Distribution Liability: Although this data set has been us ed 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 responsibi lity 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 purp oses only and does no t imply endorsement by the U.S. Government. Standard Order Process: Digital Form: Digital Transfer Information: Format Name: Export Format Information Content: Full coverage File Decompression Technique: zipped Transfer Size: 1 Digital Transfer Option: Online Option: Computer Contact Information: Network Address: Network Resource Name: http://water.usgs.gov/GIS/dsdl/ofr99- 77_geol75m.e00.gz Network Resource Name: http://water.usgs.gov/GIS/dsdl/ofr99- 77_geol75m.e00.zip Digital Form: Digital Transfer Information: Format Name: DLG 

### Pa g e 8 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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...Format Information Content: Full coverage File Decompression Technique: zipped Transfer Size: 1 Digital Transfer Option: Online Option: Computer Contact Information: Network Address: Network Resource Name: http://water.usgs.gov/GIS/dsdl/ofr99- 77_geol75m.dlg.tgz Network Resource Name: http://water.usgs.g ov/GIS/dsdl/ofr99-77_geol75m.dlg.zip Digital Form: Digital Transfer Information: Format Name: SDTS Format Information Content: Full coverage File Decompression Technique: zipped Transfer Size: 1 Digital Transfer Option: Online Option: Computer Contact Information: Network Address: Network Resource Name: http://water.usgs.gov/GIS/dsdl/ofr99- 77_geol75m.sdts.tgz Network Resource Name: http://water.usgs.gov/GIS/dsdl/ofr99- 77_geol75m.sdts.zip Fees: None. This dataset is provided by USGS as a public service.

Metadata Reference Information: Metadata Date: 20041108 Metadata Contact: Contact Information: Contact Organization Primary: Contact Organization: U.S. Geological Survey Contact Position: Ask USGS -- Water Webserver Team Contact Address: Address Type: mailing Address: 445 National Center City: Reston State or Province: VA 

### Pa g e 9 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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...Postal Code: 20192 Contact Voice Telephone: 1-888-275-8747 (1-888-ASK-USGS) Contact Electronic Mail Address: http://answers.usgs.gov/cgi-bin/gsanswers? pemail=h2oteam&subject=GIS+ Dataset+ofr99-77_geol75m Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata Metadata Standard Version: FGDC-STD-001-1998



### ESRI Metadata

Creation Date: 20100122 Creation Time: 07154800 Published Document ID: {C432E588-CDFB-4CE3-5070-4870290BF0F9} (PubSourceCd):0 Modification Date: 20051004 Modification Time: 07154800 (issecured):false (resourceType):002 (primaryOnlink):http://wat er.usgs.gov/GIS/dsdl/ofr99-77_geol75m.e00.gz

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### Pa g e 10 of 10 Di g ital data set describin g surficial g eolo gyin the conterminous US

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