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Hayakawa Pyroclastic Flow Deposits Hayatsu, 1972

• Type locality: Left bank of Maekawa river, Nakagawarashinden - Tsuchikura, Itoigawa city, Niigata prefecture
• Tephra
• Holocene (1,050 - 790, 725 - 706 yBP, ¹⁴C)

• Lithofacies: Pyroclastic flow deposit (3 - 4 flow units)
• Lithofacies: Hornblende pyroxene andesite - Dacite breccia, Volcanic ash, Charcoal

• Source: Niigata-Yakeyama volcano
• Thickness: 5 - Some dozen m or thinner
• Lower limit: Unconformity (Maekawa Mudflow Deposit)

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

• Distribution: Nakagawarashinden - Tsuchikura - Otosaka, Itoigawa city, Niigata pref.

• Nagamori et al. (2018) Geology of the Itoigawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 75p. (in Japanese with English abstract 3p.)
• 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.)