by M.A. Wise and S.S. Johnson, 1;125,000-scale map with gravity contours and text, 1980. Gray-scale map of Culpeper Basin and vicinity showing location of diabase, basalt, sedimentary, and undifferentiated crystalline rocks at a scale of 1:125,000. Superimposed on the geology are red lines contouring the simple Bouguer gravity anomaly calculated from 1,927 gravity observations. Contour interval is 1.0 milligal. A brief description of the general geology of the basin written by B. D. Leavy, and descriptions of 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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