Figure F95. Example of an artifact caused by a core piece with order of magnitude variation in remanent intensity. Apparent reversal transition in Section 209-1268A-21R-1 (Piece 1) was recorded in continuous measurement of archive half. A. Vector endpoint diagrams from the two sides of the piece and stereonet projection of directions obtained at 2-cm intervals (top: Section 209-1268A-20R-2, 8 cm; bottom: Section 209-1268A-20R-2, 20 cm). B. Measurement of the remanence declination, inclination, and intensity of the same piece alone after 80-mT AF step. The core piece was measured alone so that header and trailer signals were recorded. The transitional directional trend at 12 cm (in the middle of the piece) has a mirror image at 28 cm, 8 cm away from the piece end. This demonstrates that the antipodal directions reflect the negative response function along x- and y- magnetometer axes at distances of 10 cm from the SQUID center. NRM = natural remanent magnetization.

Figure F95. Example of an artifact caused by a core piece with order of magnitude variation in remanent intensity. Apparent reversal transition in Section 209-1268A-21R-1 (Piece 1) was recorded in continuous measurement of archive half. A. Vector endpoint diagrams from the two sides of the piece and stereonet projection of directions obtained at 2-cm intervals (top: Section 209-1268A-20R-2, 8 cm; bottom: Section 209-1268A-20R-2, 20 cm). B. Measurement of the remanence declination, inclination, and intensity of the same piece alone after 80-mT AF step. The core piece was measured alone so that header and trailer signals were recorded. The transitional directional trend at 12 cm (in the middle of the piece) has a mirror image at 28 cm, 8 cm away from the piece end. This demonstrates that the antipodal directions reflect the negative response function along x- and y- magnetometer axes at distances of 10 cm from the SQUID center. NRM = natural remanent magnetization.