Figure F72. Magnetic measurements in Jurassic basement, deviation from true vertical, and the FMS caliper data for Hole 801C are shown with major lithologic sequences determined from core-log integration of Leg 129 and 185 data. Downhole magnetic intensity data exhibit similar patterns of variability in both the horizontal and vertical components. A large-amplitude variation at the top of the upper pillows and flows section marks the beginning of a long-wavelength variation in the total magnetic intensity.