Figure F54. Close-up of the inferred location of the Cretaceous/Tertiary boundary between 41 and 47 cm. Note the scattered coarser grains in two mudstone intervals (54-58 cm and 41-43 cm). The burrowed unit between 47 and 54 cm is marlstone. See text for discussion of possible significance (interval 210-1276A-21R-4, 39-65 cm).

Figure F54. Close-up of the inferred location of the Cretaceous/Tertiary boundary between 41 and 47 cm. Note the scattered coarser grains in two mudstone intervals (54-58 cm and 41-43 cm). The burrowed unit between 47 and 54 cm is marlstone. See text for discussion of possible significance (interval 210-1276A-21R-4, 39-65 cm).