Proc. IODP, 322, Methods

Table T2. Classification of volcanic lithologies. (See table notes.)

	Mixture
	Tephras	Volcaniclastic deposits	Epiclastic deposits
>64 mm	Pyroclastic breccia	Volcaniclastic breccia/conglomerate	Breccia/Conglomerate
2–64 mm	Lapilistone/Lapili tuff	Volcaniclastic gravel	Gravel
64 µm–2 mm	Coarse ash/tuff	Volcaniclastic sandstone	Sandstone
2–64 µm	Fine ash/tuff	Volcaniclastic siltstone	Siltstone
<2 µm	Volcanic dust	Volcaniclastic volcanic dust	Claystone
Amount of pyroclasts	≥75%	<75% to >25%	≤25%

Notes: Modified after Fisher and Schmincke (1984). If >25% of volcaniclasts are vitric pyroclasts, then material is tuffaceous.