Figure F9. Co in pentlandite shows a sharp increase coincident with the base of Leg 176 lithologic unit X (dashed line at 954 mbsf) and a steady decrease in samples below our proposed lithologic unit boundary at between 1165 and 1190 mbsf). The dark horizontal line marks the depth of this abrupt mineralogical and geochemical boundary.

Figure F9. Co in pentlandite shows a sharp increase coincident with the base of Leg 176 lithologic unit X (dashed line at 954 mbsf) and a steady decrease in samples below our proposed lithologic unit boundary at between 1165 and 1190 mbsf). The dark horizontal line marks the depth of this abrupt mineralogical and geochemical boundary.