Figure F48. Unaltered glass in the interiors of vitric clasts in Sample 192-1184A-42R-1, 147-150 cm of Subunit IIE. Only a narrow rim of smectite alteration is present at the margins of these clasts (field of view = 2.8 mm; plane-polarized light; photomicrograph ID# 1184A

Figure F48. Unaltered glass in the interiors of vitric clasts in Sample 192-1184A-42R-1, 147-150 cm of Subunit IIE. Only a narrow rim of smectite alteration is present at the margins of these clasts (field of view = 2.8 mm; plane-polarized light; photomicrograph ID# 1184A_082).