Figure F42. Common volcanogenic grains observed in smear slides. A. Pumice fragments (sand size) and vitric ash (silt size) (Sample 338-C0002J-1R-1, 56 cm; PPL). B. Brown volcanic glass (Sample 338-C0002J-2R-1, 5 cm; PPL). C. Microlitic clear glass with flow structure (Sample 338-C0002J-2R-1, 5 cm; PPL). D. Microlitic brown glass (Sample 338-C0002J-4R-5, 36 cm; PPL).
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