Figure F19. Plots of natural remanent magnetization after alternating field (AF) demagnetization to 80 mT. A. Sample 347-M0061A-3H-1, 89 cm; 5.89 mcd. B. Sample 347-M0061A-4H-1, 138 cm; 9.81 mcd. C. Sample 347-M0061A-9H-2, 120 cm; 22.01 mcd. Category 2 and 3 vectors trend toward the origin and display high magnetic stability, whereas Category 1 vectors contain a low-stability component. The vector veers into a plane perpendicular to the last demagnetization axis, which is a sign of gyroremanent magnetization acquisition. Open squares = vertical, solid squares = horizontal.
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