Figure F7. Summary figure illustrating change in degree of ash alteration, which occurs somewhere between 60 and 90 mbsf in Hole C0012C. A. Detail of Section 333-C0012C-7H-8. B. Fresh volcanic glass on a smear slide of Sample 333-C0012C-7H-8, 17 cm (at 59.24 mbsf, within lower part of Subunit IA). C. Detail of Section 333-C0012C-11H-5. D. Altered glass on a smear slide of Sample 333-C0012C-11H-5, 30 cm (at 91.19 mbsf, within upper part of Subunit IB).
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