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Hirasu Formation Otsuka, 1938

• Type locality: Hirasu, Minobu city, Minamikoma county, Yamanashi prefecture
• Coherent formation
• Higher Terrace Deposit
• Pleistocene (ca. 0.2 Ma?)

• Sedimentary facies: Slope collapse deposit, Talus deposit
• Lithofacies: Breccia

• Thickness: 20 - 55 m
• Lower limit: Unconformity (Fujikawa Group)

• Distribution: Hirasu - Yogosawa - Yazaiku, Minobu city, Minamikoma county, Yamanashi pref.

• Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)