Figure F12. Close-up photograph of a black ash layer of intermediate composition (interval 202-1233C-2H-6, 57-91 cm). The layer is ~8 cm thick, has a sharp basal contact, and grades upward into the overlying sediment.

Figure F12. Close-up photograph of a black ash layer of intermediate composition (interval 202-1233C-2H-6, 57-91 cm). The layer is ~8 cm thick, has a sharp basal contact, and grades upward into the overlying sediment.