1:24,000-scale bedrock-topography contours for Ohio

20231108 08333300 FALSE 20150108 16083100 20150108 16083100 BTContours_Wood 002 Projected GCS_North_American_1983 Linear Unit: Foot_US (0.304801) NAD_1983_StatePlane_Ohio_South_FIPS_3402_Feet <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.1'><WKT>PROJCS["NAD_1983_StatePlane_Ohio_South_FIPS_3402_Feet",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",1968500.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-82.5],PARAMETER["Standard_Parallel_1",38.73333333333333],PARAMETER["Standard_Parallel_2",40.03333333333333],PARAMETER["Latitude_Of_Origin",38.0],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",3735]]</WKT><XOrigin>-119670699.9996032</XOrigin><YOrigin>-95612899.999233946</YOrigin><XYScale>1953.1249981810104</XYScale><ZOrigin>-100000</ZOrigin><ZScale>8000</ZScale><MOrigin>-100000</MOrigin><MScale>8000</MScale><XYTolerance>0.0040960000038146975</XYTolerance><ZTolerance>0.002</ZTolerance><MTolerance>0.002</MTolerance><HighPrecision>true</HighPrecision><WKID>102723</WKID><LatestWKID>3735</LatestWKID></ProjectedCoordinateSystem> 1.0 ESRI ArcCatalog 8.3.0.800 en This data set contains the bedrock-topography contour lines for the state of Ohio. This data set was created as part of a project to create the new state bedrock-geology map for Ohio. The contours come from a number of different sources, which include new mapping done at the 1:24,000 scale and existing mapping done at 1:24,000 and 1:62,500 scale. Existing county bedrock topography maps were photo-enlarged to 1:24,000 scale to match individual 7.5-minute quadrangles. This data set was originally developed as one of the essential elements to remapping the bedrock geology of Ohio. In the glaciated portion of the state, and in other areas of drift filled valleys, the bedrock surface is commonly buried beneath thick deposits of unconsolidated materials. Bedrock-topography maps allow the geologist to analyze the bedrock landscape beneath this covering of surficial deposits. All bedrock-topography map contours were originally drawn by hand for most of the 788 quadrangles in the state and later converted into digital files through the digitizing process. Ohio Division of Geological Survey 2003 1:24,000-scale bedrock-topography contours for Ohio BTContours_Wood vector digital data withheld BG 3B Columbus, OH Ohio Division of Geological Survey 1CD-ROM, GIS file format. publication date 2003 Complete Irregular -84.014199 -83.246071 41.724115 41.073364 1554792.619921 1762735.120467 1122997.129706 1357669.839557 ODNR-CATEGORIES GEOLOGIC/SOILS ODNR-COUNTIES Entire State ODNR-QUADS Entire State Pleistocene None Holocene Quaternary Tertiary ODNR-STATE Ohio None Bedrock Topography Bedrock Geology There are no access constraints on this data set. This product of the Ohio Department of Natural Resources, Division of Geological Survey is intended to provide general geologic information only and should not be used for any other purpose. It is not intended for resale or to replace site-specific investigations. These data were compiled by the Ohio Division of Geological Survey, which reserves the publication rights to this material. If these data are used in the compilation of other data sets or maps for distribution or publication, this source must be referenced. Recommended bibliographic citation: Ohio Division of Geological Survey, 2003, Bedrock-topography data for Ohio: Ohio Geological Survey BG-3, 1 CD-ROM, GIS file format. The information contained herein may be updated or edited in the future. Future releases of this material, if altered, will display a revision date. Users should check to ensure they have the latest version and reference the appropriate revision date if it is being used in other works. Neither the Ohio Department of Natural Resources, nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of this product. Any use thereof for a purpose other than for which said information or product was intended shall be solely at the risk of the user. Personal GeoDatabase Feature Class

Ohio Division of Geological Survey

4383 Fountain Square Drive

mailing and physical address Columbus OH 43224-1362 USA E. Mac Swinford Ohio Division of Geological Survey Geology Program Supervisor 614-265-6473 614-447-1918 mac.swinford@dnr.state.oh.us 8:30 a.m. - 5:30 p.m. E. Mac Swinford 1997 Remapping of the bedrock geology of Ohio completed document Ohio Geology Summer Columbus, OH Ohio Division of Geological Survey p. 1, 3 Version 6.2 (Build 9200) ; Esri ArcGIS 10.1.1.3300 BTContours_Wood -84.014199 -83.246071 41.724115 41.073364 1 1554792.619921 1762735.120467 1357669.839557 1122997.129706 1 en FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time mailing and physical address Columbus OH 43224-1362

Ohio Division of Geological Survey

4383 Fountain Square Drive

USA 614-265-6601 James McDonald Ohio Division of Geological Survey GIMS Specialist 2 614-447-1918 jim.mcdonald@dnr.state.oh.us 8 a.m. - 5 p.m. 20040305 There are no constraints on accessing the metadata. The metadata are not to be modified or removed from the data set. Only personnel from the Ohio Division of Geological Survey may modify the metadata. N/A Unclassified N/A 20021105 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset Ohio Division of Geological Survey BG-2

Geologic Records Center

Ohio Division of Geological Survey

4383 Fountain Square Drive

mailing and physical address Columbus OH 43224-1362 USA Ohio Division of Geological Survey Geologic Records Center 614-265-6576 614-447-1918 geo.survey@dnr.state.oh.us 8:30 a.m. - 4:30 p.m. SHP ArcGIS 8.2 120.674 120.674 CD-ROM Please contact the Geologic Records Center for more information. 1 day None specified. 002 withheld Local Area Network 120.674 Personal GeoDatabase Feature Class File Geodatabase Feature Class Vector Simple FALSE 0 TRUE FALSE GCS_North_American_1983 NAD_1983_StatePlane_Ohio_South_FIPS_3402_Feet coordinate pair survey feet 0.002048 0.002048 North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Explicit elevation coordinate included with horizontal coordinates 0.000010 National Geodetic Vertical Datum of 1929 feet NAD_1983_StatePlane_Ohio_South_FIPS_3402_Feet EPSG 7.11.2 0 BTContours_Wood Feature Class 0 Line attribute data ODGS OBJECTID OBJECTID OID 4 0 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 0 0 0 Feature geometry. ESRI Coordinates defining the features. ELEVATION ELEVATION Integer 4 Bedrock topography elevation, in feet above sea level ODGS Positive real numbers that represent that are referenced to elevation above sea level. 0 0 TYPE_ TYPE_ String 16 State boundary The boundary between Ohio and one of its surrounding states ODGS Quad boundary A 7.5-minute quadrangle boundary ODGS contours The bedrock-topography elevation contour line ODGS Type of line ODGS 0 0 Shape_Length Shape_Length Double 8 Length of feature in internal units. ESRI Positive real numbers that are automatically generated. 0 0 20150108 Generally greater than 95% Generally greater than 95% Most to all of the contours were verified against the source documents or scans of the source documents. In some cases several layers of checking were performed Topology for this data layer was built using the Arc/Info CLEAN and BUILD commands. All line work appearing on the source documents has been digitally captured and visually reviewed for accuracy of position and value. The amount of maps and lines suggests that, statistically, some of these data would have been omitted by human error. The goal for mapping bedrock topography was to generate line work in which the accuracy of the lines was plus or minus one contour interval. Bedrock-topography contour intervals change from map to map and can change within a 7.5 minute-scale map as the geology and data require. Therefore, the one-contour interval rule varies quantitatively on a map-by-map basis. Accuracy of plus or minus one contour interval was the goal of the program and needs to be assessed from map to map depending on the contour interval and data distribution. Common contour intervals used on the maps are 20 feet, and to a lesser extent 50 feet. Other contour intervals present on the bedrock-topography maps include 5, 10, 25, and 100 feet. Position of the line depended on the data available and the geologist's interpretation of these data. Bedrock-topography maps of Ohio Ohio Division of Geological Survey Ohio Division of Water U.S. Geological Survey Various college and university Master's theses and Doctoral dissertations 1960-2002 Varies Mylar, Paper ODGS-BTM This source contributed the bedrock-topography contours. 1960's 2002 publication date An open-file bedrock-topography map for each 7.5-minute quadrangle was generated as a new product or photographically reproduced from existing documents to match the 1:24,000 scale. This effort lasted from 1989 to 2002. withheld During the mapping process and after mapping was completed, ODGS moved forward on converting these hand-drawn lines into a digital format. When mapping was completed, approximately 30% of the 788 bedrock-topography maps had been digitized. withheld The remaining maps were sent to a subcontractor, where the maps were reviewed for discrepancies before being digitized. withheld Maps were color scanned. The scanned images were used as source for heads-up digitizing. The source documents were available to the digitizing personnel as a reference. withheld Digital files were reviewed by the subcontractor's geological staff for accuracy of line work and line values. Files were delivered to ODGS in ARC format. withheld Dataset copied. withheld 20021212 09460500 Dataset copied. withheld 20040224 10475000