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Lower Unit

Abbr. So-OT pfd-l

• Type locality: west Katamata, Yaita city, Tochigi prefecture
• Volcanic rocks
• Eruption products of a collapse caldera which formed Shiobara basin
• Pleistocene

• Lithofacies: Pumice flow deposit
• Lithofacies: Matrix-supported pumiceous volcanic lapilli tuff

• Source: Shiobara caldera
• Thickness (Katamata): 1 m or thinner
• Thickness (Tobiyama): ca. 35 cm
• Thickness (Yanome): ca. 16 cm
• Upper limit: Conformity (Middle Unit)

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

• Distribution: Katamata, Yaita city, Tochigi pref.

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