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Shiobara-Otawara Pyroclastic Flow Deposit

Abbr. So-OT pfd

Invalid synonym: Tatenokawa Pumice Flow Deposit, Tatenokawa Pyroclastic Rocks, Tatenokawa Tuff, Otawara Pyroclastic Flow Deposit (Ot pfl)

A part of Shiobara-Shimogo Tephra Group

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

• Lithofacies: Pyroclastic flow deposit
• Lithofacies: Pumice flow deposit, Scoria flow deposit

• Source: Shiobara caldera
• Thickness: 1.6 m

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

• Distribution: Taki, Shimoarahari village, Utsunomiya city, Tochigi pref.; Kinwasakiiwa, Yamada, Yaita city, Tochigi pref.

• Yamada et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.837-855 DOI
• Suzuki (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.121-133 DOI