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Nagakura Formation

• Coherent formation
• Pleistocene

• Lithofacies: Gravels
• Lithofacies: Mud, Sands, Rhyolitic volcanic ash

• Thickness: 20 m
• Thickness (Rhyolitic volcanic ash): 50 cm
• Upper limit: Unconformity (Nakamura Formation)
• Lower limit: Unconformity (Itokaya Pyroclastic Flow Deposit, Itokaya Lava)

• Distribution: Shibukawa river, Chino city, Nagano pref.

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