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Upper Unit

Abbr. So-OT pfd-u

• Type locality: Tobanoyu hot spring, Shioya city, Shioya county, Tochigi prefecture
• Volcanic rocks
• Eruption products of a collapse caldera which formed Shiobara basin
• Pleistocene

• Lithofacies: Scoria flow deposit
• Lithofacies: Poorly sorted matrix-supported scoriaceous volcanic lapilli tuff

• Source: Shiobara caldera
• Thickness (Tobanoyu hotspring): 5 m or thicker

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

• Distribution: Tobanoyu hotspring, Shioya city, Shioya county, Tochigi pref.; Katamata, Yaita city, Tochigi pref.

• Yamada et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.837-855 DOI