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Kuonji Formation (Matsuda, 1961) Ozaki and Sugiyama, 2018

Invalid synonym: Kuonji Member, Kamanokuchi Member

• Type locality: Main building of Kuonji temple, Minobu city, Minamikoma county, Yamanashi prefecture
• Coherent formation
• late Miocene (Foraminifera)
• Correlation: Hara Formation, Shimobe Formation, lower Minobu Formation
• Intruded by: Aimata Intrusive Rocks

• Sedimentary facies: Marine
• Depth of water: Middle bathyal or deeper (Foraminifera)
• Lithofacies: Mudstone
• Lithofacies (Minor): Biotite hornfels, Sandstone, Dacite - andesite tuff

• Thickness: ca. 650 - 1,000 m or thicker
• Upper limit: Conformity (Takatori Volcaniclastic Rocks, Sandstone and Mudstone Member), Unconformity (Akebono Formation)
• Lower limit: Conformity (Kayanokitoge Basalt Member, Funayama Mudstone Member)

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

• Distribution: Minobu - Odafunahara - Aimata - Kadono, Minobu city, Minamikoma county, Yamanashi pref.; Gotenyama - Kamanokuchi - Togurigawa river, Nanbu city, Minamikoma county, Yamanashi pref.
• Fossils: Sponges (Makiyama sp.), Foraminifera (Globigerina nepenthes, Globorotalia siakensis)

• Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)
• Sugiyama and Matsuda (2014) Geology of the Nanbu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 134p. (in Japanese with English abstract 5p.)