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Iw-ph4 Tephra Ito et al., 2018

• Phreatic eruption deposit
• Holocene (2.8 - 2.7 cal ka, ¹⁴C)

• Sedimentary facies: Terrestrial
• Lithofacies: Argilliceous volcanic ash

• Source: Mound Yakushidake
• Thickness: 3 cm

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Omisaka slope, Mount Yakushidake, Mount Iwate, Iwate pref.

• Itoh et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.4, pp.271-296 DOI