Fig. 2. (A) Polished block of lower coarse-grained facies (NG-2) exhibits massive and assorted greenish grey coarse-ash rich groundmass sprinkled with lapillisize
angular clasts. Bar ¼ 1 cm. (B) Plane polarized photomicrograph of coarse-grained facies showing poorly sorted angular frameworks loosely packed in
dark grey amorphous to recrystallized glassy matrix. Black Bar ¼ 1 mm. Note a large pumice clast (arrowed) in the middle of the photograph. (C) Polished
block of finer-grained facies. Clast size grading is very prominent in the lower part, the upper part appears massive with presence of outsized vitrophyric clasts
enveloped by wispy laminae at the upper right corner. Note angular and subrounded clasts at the base of the bed Bar ¼ 1 cm. (D) Plane polarized
photomicrograph of finer-grained facies showing framework fragments of glass and crystals more or less tightly packed. Note cuspate shaped glass fragments
with long tube vesicle (arrowed) and dark grey unbroken vesicles (arrowed). White Bar ¼ 0.5 mm.