Figure F8. Close-up photograph of the Unit III/IV boundary, seen at ~22-23 cm (interval 194-1198B-33R-1, 18-37 cm; 503.58-503.78 mbsf). Alternations of submillimeter-scaled unoxidized pyrite and phosphate layers encrust the top of Unit IV, indicating a hardground layer. Below this, altered(?) rhodoliths in a fine-grained, brownish-stained matrix with few planktonic foraminifers and neritic-derived grains are observed.

Figure F8. Close-up photograph of the Unit III/IV boundary, seen at ~22-23 cm (interval 194-1198B-33R-1, 18-37 cm; 503.58-503.78 mbsf). Alternations of submillimeter-scaled unoxidized pyrite and phosphate layers encrust the top of Unit IV, indicating a hardground layer. Below this, altered(?) rhodoliths in a fine-grained, brownish-stained matrix with few planktonic foraminifers and neritic-derived grains are observed.