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Kotakiyama Group (Utsukushigahara collaborative research group, 1990)

Invalid synonym: a part of Sanjiro Formation, Futatsuyama Formation, Kotakiyama Volcanics, Daimonsawa Formation of Tozawa Formation

• Volcanic rocks
• Pliocene (Plants)

• Sedimentary facies: Debris flow deposit
• Lithofacies: Andesite - Dacite
• Lithofacies: Lava, Volcanic breccia, Tuff breccia
• Lithofacies (Minor): Sandstone, Siltstone

• Upper limit: Unconformity (Sanjiro Volcaniclastics, Tobiratoge Volcaniclastics)

• Distribution: Utsukushigahara plateau, Nagano pref.

• Mukai et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.400-422 DOI