Subaqueous eruption and emplacement of OT2 in the Middle Miocene Iizuka Formation, Noto Peninsula, Japan

The poorly defined two layers of OT2 are interpreted to be ash turbidites individually produced by discrete phreatomagmatic explosions. Lenticular bedforms and channels indicate that the currents were fully turbulent and unsteady, fed by the submarine eruptions. Upward coarsening of pumice probably represents settling lag of hot pumice. OT2 perhaps provides potential diagnostic features to identify eruption-fed turbidites.