Figure F12. Photomicrographs of dacitic volcanic glass with embedded magnetite showing bacterial habitation (Sample 193-1191A-3R-1, 62-65 cm [15.32 mbsf]). The sample consists mainly of (A) brown translucent fragments (see arrows), (B) some spherical opaque grains of magnetite (see arrow 1) and lath-shaped plagioclase microlites (see arrow 2) embedded in glass, and (C) sparse bacterial populations, including a few colonies (see arrows), which were located on the surfaces of these fragments.

Figure F12. Photomicrographs of dacitic volcanic glass with embedded magnetite showing bacterial habitation (Sample 193-1191A-3R-1, 62-65 cm [15.32 mbsf]). The sample consists mainly of (A) brown translucent fragments (see arrows), (B) some spherical opaque grains of magnetite (see arrow 1) and lath-shaped plagioclase microlites (see arrow 2) embedded in glass, and (C) sparse bacterial populations, including a few colonies (see arrows), which were located on the surfaces of these fragments.