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Tsutagawa Pyroclastic Deposit Takarada and Muraoka, 2004

Invalid synonym: Tsutagawa Tuff

• Type locality: Tsuta Power Plant, Tsuta river, Towada city, Aomori prefecture
• Pre-caldera volcanoes
• Tephra
• Pleistocene (ca. 0.65 - 0.35 Ma)

• Sedimentary facies: Lacustrine
• Sedimentary facies: Pyroclastic flow deposit, Pumice fall deposit, Tephra fall deposit, Lahar
• Lithofacies: Pumice tuff, Pumice, Scoria, Sandstone, Siltstone

• Source: Minami-Hakkoda volcanoes
• Thickness: ca. 10 - 15 m
• Thickness (Sediments): 3 m
• Thickness (Pumice fall): ca. 4 m
• Thickness (Pyroclastic flow): 3 m
• Thickness (Tephra fall): 3 m
• Upper limit: Unconformity (Hakkoda 2nd-stage Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Hakkoda 1st-stage Pyroclastic Flow Deposit)

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

• Distribution: Tsuta river, Towada city, 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.)