Figure F21. Close-up of middle Eocene unconformity and sedimentary dike. The interval 111-113 cm marks the position of a middle Eocene unconformity defined by biostratigraphic studies. The graded grainstone from 123 to 137 cm overlies a sedimentary dike. Three-dimensional examination of the core shows that this is a folded sheet of sand-grade sediment extending down from the base of the overlying grainstone bed. The grain size of the dike is identical to that in the overlying carbonate grainstone, showing that the sediment protruded downward from the bed base. It differs in shape from, and crosscuts, the adjacent burrows (top of Unit 2: interval 210-1276A-8R-5, 109-142 cm).

Figure F21. Close-up of middle Eocene unconformity and sedimentary dike. The interval 111-113 cm marks the position of a middle Eocene unconformity defined by biostratigraphic studies. The graded grainstone from 123 to 137 cm overlies a sedimentary dike. Three-dimensional examination of the core shows that this is a folded sheet of sand-grade sediment extending down from the base of the overlying grainstone bed. The grain size of the dike is identical to that in the overlying carbonate grainstone, showing that the sediment protruded downward from the bed base. It differs in shape from, and crosscuts, the adjacent burrows (top of Unit 2: interval 210-1276A-8R-5, 109-142 cm).