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Towada-Okuse Pyroclastic Flow Deposit (Oike and Nakagawa, 1979) Takarada and Muraoka, 2004

Abbr.: To-OS

Invalid synonym: Okuse Pyroclastic Flow Deposit, Takadate-b Tephra, Okuse ignimbrite

• Type locality: Sennosawa creek Towada, Towada city, Aomori prefecture
• Tephra
• late Pleistocene (ca. 55 ka)

• Lithofacies: Augite hypersthene andesite
• Lithofacies: Scoriaceous pyroclastic flow deposit

• Source: Towada caldera
• Thickness: ca. 20 m
• Upper limit: Unconformity (Towada-Ofudo Pyroclastic Flow Deposit, Towada-Hachinohe Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Aobunayama Pyroclastic Rocks and Lava, Komasuzawa Formation)

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

• Distribution: Sennosawa creek - Katafuchi river - Omonai - Kawashiro, Towada city, Aomori pref.

• Kudo (2005) Geology of the Towada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)
• Takarada and Muraoka (2004) Geology of the Hakkoda San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)