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Okusoechi Pyroclastic Flow Deposit

• Volcanic rocks
• Caldera-forming pyroclastic flow?
• early Pleistocene

• Sedimentary facies: Pyroclastic flow deposit

• Lower limit: Unconformity (Oharakokushoku Lava, Iwappara Lava, Okusoechi Lava)

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

• Distribution: Okusoechi - Iwappara, Yuzawa city, Minamiuonuma county, Niigata pref.

• Chihara et al. (1981) Geology of the Echigo-Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 108p. (in Japanese with English abstract 8p.)