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Akagiyama Gravel Matsumoto Basin Research Group, 1972

• Type locality: Mount Akagiyama, Matsumoto city, Nagano prefecture
• Coherent formation
• late Pleistocene
• Correlation: Osakada Gravel

• Sedimentary facies: Fluvial
• Sedimentary facies: River terrace deposit
• Lithofacies: Gravels
• Lithofacies (Lower, Minor): Peat

• Thickness: 10 - 80 m or thicker

• Distribution: Mount Akagiyama - Ushibusegawa river - Nakayama - Mount Shiroyama, Matsumoto city, Nagano pref.; Odairahara, Azumino city, Nagano pref.
• Tephra: Tt-D

• Harayama et al. (2009) Geology of the Matsumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 3p.)
• Katada and Isomi (1964) Shiojiri, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 52p. (in Japanese with English abstract 10p.)