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Akiruppara Formation Masubuchi, 2001

• Type locality: Basue, Miyoshino, Hirai, Hinode city, Nishitama county, Tokyo
• Coherent formation
• late Pleistocene (12 - 10 ka)

• Sedimentary facies: Fluvial
• Sedimentary facies: Flood flow depositl
• Lithofacies: Sands, Gravels, Clay

• Thickness: a few dozen cm - ca. 1.7 m
• Lower limit: Unconformity (Tachikawa 2 Formation, Tachikawa Loam)

• Distribution: Hirai, Hinode city, Nishitama county, Tokyo; Harakomiya - Aburadai, Akiruno city, Tokyo

• Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)