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Hiderida Formation, Akahane, 1979

• Type locality: Hiderida, Togakushi, Nagano city, Nagano prefecture
• Coherent formation
• early - middle Pleistocene

• Lithofacies: Debris flow deposit
• Lithofacies (Upper): Muddy sandstone
• Lithofacies: Gravels

• Thickness (Upper): ca. 10 m
• Thickness: 30 m or thicker
• Upper limit: Unconformity (Iizuna Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Sarumaru Formation)

• Distribution: Hiderida - Orihashi, Togakushi, Nagano city, Nagano pref.

• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)