Table T6. Classification of volcanic lithologies, Expedition 338.
| Size fraction | 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% |
Modified after Fisher and Schmincke (1984). If >25% of volcaniclasts are vitric pyroclasts, then material is tuffaceous.
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