by S.S. Johnson and A.J. Froelich, 1:125,000-scale map with aeromagnetic contours and text, 1982. 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. Red lines contouring the total intensity magnetic field overlay the map. The contours summarize the data from a 1981 aeromagnetic survey flown at an altitude of 500 feet with flight lines spaced at 0.75 miles. The contour interval is 100 gammas. This is the first published aeromagnetic survey of the entire Culpeper Basin.
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