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Miasa Formation Himekawa Research Group, 1958

Invalid synonym: Goshakubo Formation

• Type locality: Yachigawa river, Hakuba city, Kitaazumi county - Ichiuda, Omachi city, Nagano prefecture
• Coherent formation
• Pliocene

• Lithofacies: Interbedded pyroclastic flow deposit and sandy conglomerate
• Lithofacies (Minor): Sandy mudstone

• Thickness: 3,000 m or thicker
• Upper limit: Unconformity (Oshio Pyroclastic Flow Deposit, Omine Debris Deposits)

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

• Distribution: Yachigawa river, Hakuba city, Kitaazumi county - Ichiuda, Omachi city, Nagano pref.

• Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)