Figure F16. Highly disturbed interval caused by XCB coring. The harder drilling biscuits (e.g., 96-97.5 and 102-105 cm) are composed of fine-grained, indurated silty clays. The biscuits are surrounded by softer, relatively coarser material that was washed in by coring, resulting in "false bedding" (interval 180-1109C-35X-3, 96-110 cm).