by S.S. Johnson, L.S. Wiener, and J.F. Conley, map with text and gravity contours, 1985. Gray-scale map showing the general geology of the Danville-Dan River basin at a scale of 1:125,000 overlain with red lines contouring the simple Bouguer gravity anomaly calculated from 1,814 gravity observations. Contour interval is 1.0 milligal. Brief descriptions of the general geology of the basin, the method used to collect the gravity observations, and procedure to calculate and create the contour lines are included on the map.
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