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Chigase Formation (Kubota, 1977) Ueki and Sakai, 2007

• Type locality: east of Shimookutama bridge, Chigase town, Ome city, Tokyo
• Coherent formation
• Holocene

• Sedimentary facies: Fluvial
• Lithofacies: Gravels
• Lithofacies (Minor): Sands

• Thickness: 2 - 10 m
• Lower limit: Unconformity (Chichibu Belt, OMe Formation)

• Distribution: Chigase town - Oyanagi town - Kabe town - Hatakenaka - Tomoda town, Ome city, Tokyo; Hanenishi, Hamura city, Tokyo; Fussa, Fussa city, Tokyo; Yamada - Hikita - Ushinuma - Shimokubo, 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.)