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Osawagawa Formation Ozawa et al., 1983

• Type locality: Nishimata creek - Asahimata creek, Osawa river, Nishimeya city, Nakatsugaru county, Aomori prefecture
• Accretionary complex?
• before Cretaceous
• Intruded by: Nishimeya Granites, Aplite

• Sedimentary facies: Marine?
• Lithofacies: Hornfels
• Lithofacies (Protolith): Sandstone, Mudstone, Tuffaceous sandstone
• Sedimentary structures: Cross stratification

• Thickness: 600 m or thicker
• Upper limit: Unconformity (Fujikuragawa Formation)

• Distribution: Nishimata creek - Asahimata creek, Osawa river, Nishimeya city, Nakatsugaru county, Aomori pref.

• Ozawa et al. (1983) Geology of the Nakahama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 62p. (in Japanese with English abstract 4p.)