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Togakushiyama Formation (Yagi, 1955) Nakano et al., 2002

Invalid synonym: Higashiyama Agglomerate, Togakushiarakura Agglomerate, Togakushi Formation, Togakushi Volcanics, Shigarami Tuff Breccia, Dotsudake Formation

• Type locality: Okusha, Togakushi shrine - Happonirami, Togakushi, Nagano city, Nagano prefecture
• Volcanic rocks
• Submarine volcano
• early Pliocene (2.98 Ma, K-Ar)
• Intruded by: Dykes
• Correlation: Arakurayama Formation (Simultaneous multiple volcanos), Chohanyama Lava?
• Correlation: Yamamoto Formation

• Sedimentary facies (Upper): Terrestrial or Shallow marine
• Sedimentary facies: Submarine lava dome, Submarine lava flow, Shallow intrusion
• Lithofacies: Basalt volcanic breccia, lava, Dacite pumiceous lapilli tuff, lava, volcanic breccia, Andesite lava, volcanic breccia
• Lithofacies (Minor): Conglomerate, Clastic rocks
• Sedimentary structures: Jigsaw fractures

• Thickness: 0 - 2,000 m
• Upper limit: Abut unconformity (Tanogashira Formation, Hikage Formation), Conformity, partly interfingered (Hikage Formation)
• Lower limit: Interfingered (Tanogashira Formation), Interfingered, Conformity (Yanagisawa Formation)

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

• Distribution: Okusha, Togakushi shrine - Happonirami, Togakushi, Nagano city, Nagano pref.; Higashiyama - Happosawa creek - Ochiaisawa creek - Kawaura - Jinchisawa creek, Kinasa, Nagano city, Nagano pref.
• Fossils (Shellfishes): Cardiidae gen. et sp. indet, Chlamys sp.

• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)
• Nakano et al. (2002) Geology of the Shiroumadake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 105p. (in Japanese with English abstract 5p.)