Suggested Citation
Johnson, T. C., 2024, Bedrock-topographic and drift-thickness map of the Bessemer, New Castle South, and Portersville 7.5-minute quadrangles, and the Pennsylvania portion of the New Middletown 7.5-minute quadrangle, Butler and Lawrence Counties, Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 24–01.0, 3 pls., scale 1:24,000, geodatabase. [Available online.]
Description
Three 1:24,000-scale, isopach maps show the thickness of drift and the topography of the underlying bedrock in the Bessemer, New Castle South, Portersville, and the Pennsylvania part of the New Middletown quadrangles. A bedrock elevation model was calculated by subtracting the corrected drift thickness model from a surface elevation model. Bedrock elevation contours were generated from the bedrock elevation model. These contours were then corrected to conform to QL2-lidar data and corrected drift thickness contours.