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Shibuegawa Pyroclastic Flow Deposit Hayatsu, 1985

Synonym: Shibuegawa Pumice Flow Deposit, Katakaigawa Pyroclastic Flow Deposit

• Type locality: Shibue river, Myoko city - Nakago ward, Joetsu city, Niigata prefecture
• Tephra
• late Pleistocene (ca. 100 ka)
• Correlation: A2 of Kubiki Loam, My-Hb

• Lithofacies: Pyroclastic flow deposit
• Lithofacies: Hornblende andesite breccia, Volcanic ash

• Source: Myoko volcano
• Thickness: 50 m or thicker
• Upper limit: Unconformity (Yashirogawa Debris Avalanche Deposits, Kubiki Loam)
• Lower limit: Unconformity (Oshika Scoria Group)

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

• Distribution: Shibue river, Myoko city - Nakago ward, Joetsu city, Niigata pref.; Nishiki town - Sanbongi-shinden - Komaruyama-shinden - Hara - Katagai river, Myoko city, Niigata pref.; Itabashi, Nakago ward, Joetsu city, Niigata pref.

• Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)
• Takeuchi and Kato (1994) Geology of the Takada-tobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 67p. (in Japanese with English abstract 5p.)
• Akahane and Kato (1989) Geology of the Takada-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 89p. (in Japanese with English abstract 3p.)