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Depth to Silurian Bedrock in Eastern Wisconsin

Silurian-aged bedrock in eastern Wisconsin is shallow, fractured, and contains groundwater that is susceptible to surface water contamination. Revisions to Wisconsin state rules ATCP50 and NR151 to regulate manure spreading over this Silurian-aged bedrock create the need for a depth-to-bedrock map of eastern WI. The Wisconsin Geological and Natural History Survey, supported by the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP)–Soil and Water Resource Management (SWRM) program, created an updated depth-to-bedrock raster surface with 5-foot and 20-foot contours over the 4,750 square-mile study area.

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