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Figure F8. Variations in ash alteration state across Subunit IA/IB boundary and Unit I/II boundary, Hole C0011D. A. Last observed downsection occurrence of unaltered glass shards in ash layers immediately above the Subunit IA/IB boundary at 251.52 mbsf (Subunit IA). B. First observed downsection appearance of altered glass in the succession at 257.22 mbsf. The appearance of such a degree of ash alteration characterizes strata within Subunit IB. C. Relatively larger degree of alteration to the ash shown in B. D. Reappearance of unaltered ash within Unit II.

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