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1st Pyroclastic Cone Deposit

• Type locality: northeast of Mount Onamedake, Tazawako, Senboku city, Akita prefecture
• Tephra
• Pyroclastic cone
• Pleistocene - Holocene
• Intruded by: Clinopyroxene orthopyroxene andesite dyke

• Lithofacies: Clinopyroxene olivine basalt
• Lithofacies: Scoria, Volcanic bomb

• Source: east of Mount Onamedake
• Upper limit: Unconformity (Onamedake Pyroclastic Cone Deposit)

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

• Distribution: northeast of Mount Onamedake, Tazawako, Senboku city, Akita pref.

• Suto and Ishii (1987) Geology of the Shizukuishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 142p. (in Japanese with English abstract 5p.)