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Koreisan Unit (Watabe et al., 1958) Hara et al., 2010

Invalid synonym: Koreisan Formation, Kamosawa Formation, Kurakake Formation, Tsuribashigoya Formation

• Accretionary complex
• Deposition (Shale): Late Cretaceous, Campanian
• Accretion: Late Cretaceous, Campanian
• Intruded by: Kofu Granodioritic Complex

• Sedimentary facies: Marine
• Lithofacies: Sandstone, Shale, Sandstone-dominant interbedded sandstone and shale
• Lithofacies (Minor): Broken facies

• Thickness: ca. 1,300 m or thicker
• Upper limit: Thrust fault (Happyakudani Unit)

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

• Distribution: Mount Koreisan - Takikawa river - Budosawa - Koreisawa - Suishodani valley - Oarakawazawa - Tokusazawa - Idosawa - Sawaradani - Mount Oborayama, Otaki, Chichibu city, Saitama pref.; Kamosawa - Kurakake, Okutama city, Nishitama county, Tokyo; Mount Karisakamine, Tabayama city, Kitatsuru county, Yamanashi pref.
• Fossils (Radiolarians): Archaeodictyomitra sp., Holocryptocanium japonica, Patulibrachium sp., Pseudodictyomitra sp.

• Hara et al. (2010) Geology of the Mitsumine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)
• Sakai (1987) Geology of the Itsukaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 5p.)