by S.S. Johnson, G.P. Wilkes, and M.R. Gwin, map with text and gravity contours, 1985. Gray-scale map showing the general geology of the Richmond and Taylorsville Triassic basins at a scale of 1:125,000 overlain with red lines contouring the simple Bouguer gravity anomaly calculated from 1627 gravity observations. Contour interval is 1.0 milligal. Brief descriptions of the general geology of the basins, 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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