Figure F168. Thermal demagnetization plots. A. A sample with relatively low blocking temperatures mostly below 300°C and little evidence of any components different from drilling overprint. Component plot at upper right shows north and east horizontal components as solid symbols and total horizontal and vertical components as open symbols. B. A sample with relatively high blocking temperatures and little drilling overprint. Component plot at upper right shows north and east horizontal components as solid symbols and total horizontal and vertical components as open symbols.

Figure F168. Thermal demagnetization plots. A. A sample with relatively low blocking temperatures mostly below 300°C and little evidence of any components different from drilling overprint. Component plot at upper right shows north and east horizontal components as solid symbols and total horizontal and vertical components as open symbols. B. A sample with relatively high blocking temperatures and little drilling overprint. Component plot at upper right shows north and east horizontal components as solid symbols and total horizontal and vertical components as open symbols.