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Koshibu Group

• Type locality: Mount Jizodake, Ina city, Nagano prefecture
• Accretionary complex
• Deposition: Middle - Late Jurassic

• Sedimentary facies: Marine
• Lithofacies: Slate, Limestone, Chert
• Lithofacies (Minor): Diabase

• Thickness: 1,000 - 2,000 m

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

• Distribution: Mount Jizodake, Ina city, Nagano pref.
• Fossils (Limestone): Neoschwagerina sp., Pseudofusulina sp.

• Kawachi (1977) Geology of the Yatsugatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 92p. (in Japanese with English abstract 4p.)