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Ogurayama Group

• Accretionary complex
• Deposition: Early - Middle Jurassic; Early Cretaceous, Hauterivian - Barremian
• Correlation: Ryokami Unit
• Intruded by: Quartz diorite, Rhyolite dike

• Sedimentary facies: Marine
• Lithofacies: Slate, Sandstone, Interbedded slate and sandstone
• Lithofacies (Minor): Chert, Limestone, Schalstein

• Thickness: 4,000 m
• Upper limit: Unconformity (Kaize Formation)

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

• Distribution: Mount Ogurayama, Kitaaiki city, Minamisaku county, Nagano pref.; Omikantaki fall, Minamiaiki city, Minamisaku county, Nagano pref.; Mount Atokurayama, Komi city, Minamisaku county, Nagano pref.
• Deposit: Skarn

• 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.)
• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)