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Osegawa Pyroclastic Flow Deposit Takarada and Muraoka, 2004

Invalid synonym: Hakkoda 0th-stage Pyroclastic Flow Deposit

• Type locality: 310 m above sea level of Ose river, Towada city, Aomori prefecture
• Pre-caldera volcanoes
• Tephra
• Pleistocene (ca. 1.0 - 0.8 Ma, Paleomagnetism)

• Lithofacies: Scoriaceous pyroclastic flow deposit
• Lithofacies: Welded tuff

• Source: around Mount Norikura or Mount Akakura
• Thickness: 15 m or thicker
• Upper limit: Unformity (Hakkoda 1st-stage Pyroclastic Flow Deposit)

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

• Distribution: Aomori pref.

• 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.)