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Takai Shale Member Akahane et al., 1992

• Type locality: Takato, Nakano city, Nagano prefecture
• Coherent formation
• Miocene
• Correlation: Bessho Formation
• Intruded in: Diorite porphyry

• Lithofacies: Hornfels
• Lithofacies (Protolith): Shale
• Sedimentary structures: Foliation

• Thickness: 100 m or thicker
• Upper limit: Unconformity (Hakoyama Volcanic Rocks)

• Distribution: Takato - Sarashina, Nakano city, Nagano pref.; Mount Misawa, Takayama city, Kamitakai county, Nagano pref.; Sano - Samusawa - Suga pass - Koike pass - Yokoyu river, Yamanouchi city, Shimotakai county, Nagano pref.
• Fossils: Fish scales

• Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)