Figure F239. Representative demagnetization behavior for archive halves. A. High-stability reversed polarity component in olivine gabbro samples. Diabase samples exhibit a range of demagnetization behavior, including (B) intervals with apparently stable normal polarity vectors, (C) samples with magnetization vectors along great circle paths toward a reversed polarity direction, and (D) samples with a small stable reversed polarity component. Open circles in A, B, and D = projections of the remanence onto the north-south vertical plane, solid circles in A, B, and D = projections of the remanence onto the horizontal plane. Open circles in C = upper hemisphere projections. Solid circles in C = lower hemisphere projections. NRM = natural remanent magnetization.
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