Figure F7. Close-up photographs of details of the boundary between Unit III and Unit IV at Site 1259. A. Glauconite-rich greenish gray claystone mixed by pervasive bioturbation with darker brown glauconitic claystone over an interval of ~12 cm (interval 207-1259B-18R-7, 36–56). B. Sharp contact without obvious bioturbation between glauconite-rich greenish gray claystone and darker brown claystone (interval 207-1259C-11R-3, 45–55 cm).