THE NEW BEDROCK GEOLOGIC MAP OF OHIO

The newly completed Bedrock Geologic Map of Ohio is the result of several cooperative bedrock-geology mapping initiatives between the Ohio Division of Geological Survey and the former U.S. Geological Survey COGEOMAP Program and the present STATEMAP component of the National Cooperative Geologic Mapping Program, the U.S. Environmental Protection Agency's nonpoint-source pollution program, and the Ohio Department of Transportation's initiatives. This map is the first detailed geologic map for Ohio since 1920, and the first to illustrate and discuss the characteristics of individual map units, their regional correlation within Ohio, and the economic commodities and geologic hazards of specific stratigraphic intervals depicted on the map. About 50 bedrock units are illustrated statewide (opposed to 14 on the 1920 map). Moreover, significant reinterpretations of the configuration of the bedrock-topography surface that lies buried beneath Pleistocene-age glacial materials has significantly changed or refined the spatial distribution pattern of bedrock units in glaciated regions of the state. Furthermore, the clarity, distribution, and configuration of regional and local structural elements within Ohio are shown. The newly produced products used to complete this map—788 bedrock-geology and bedrock-topography maps as well as over 1,800 structure contour horizons compiled on 7.5-minute quadrangle base maps— were converted to GIS. The metadata for the derivative products and the images of the individual bedrock-geology and bedrock-topography quadrangle maps have been entered into the National Geological Map Database.