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Saitsu Pyroclastic Flow Deposit (Ministry of International Trade and Industry, 1969) Yanagisawa and Yamamoto, 1998

Invalid synonym: Saitsu Formation

• Type locality: Kotaru river, Saitsu, Yonezawa city, Yamagata prefecture
• Tephra
• Pliocene (4,85, 4,6 Ma, FT; 5.9, 4.9 - 4.3, 3.3 Ma, K-Ar)
• Correlation: Hachimoriyama Formation

• Sedimentary facies: Terrestrial
• Lithofacies: Pyroclastic flow deposit
• Lithofacies: Clinopyroxene hornblende biotite dacite
• Lithofacies: Pumice lapilli tuff, Tuff breccia

• Source: Otoge caldera
• Host: Hachimoriyama Formation, Takamine Formation, Fujitoge Formation
• Thickness: 0 - 50 m
• Lower limit: Conformity (Utsutoge Formation)

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

• Distribution: Kotaru river, Saitsu, Yonezawa city, Yamagata pref.

• Furukawa et al. (2018) Geology of the Azuma Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 74p. (in Japanese with English abstract 3p.)
• Yanagisawa and Yamamoto (1998) Geology of the Tamaniwa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)