Figure F174. Subjective quality index, grouped by igneous unit or subunit, plotted against depth (center), and compared with fraction of NRM intensity remaining after 20-mT AF demagnetization. The correlation of quality index based on direction behavior with coercivity from intensity behavior is quite good.

Figure F174. Subjective quality index, grouped by igneous unit or subunit, plotted against depth (center), and compared with fraction of NRM intensity remaining after 20-mT AF demagnetization. The correlation of quality index based on direction behavior with coercivity from intensity behavior is quite good.