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Imokubo Formation (Hatori and Juen, 1958) Ueki and Sakai, 2007

Synonym: Imokubo Conglomerate Formation, Imokubo Gravel Formation, Murayama Formation

• Type locality: Ishihata park, Ishihata, Mizuho city, Nishitama county, Tokyo
• Coherent formation
• Higher Terrace Deposit
• Alluvial fan sediments
• middle Pleistocene (0.73 - 0.6 Ma)

• Sedimentary facies: Fluvial
• Lithofacies: Gravels
• Sedimentary structures: Channel structure, Imbricate structure
• Paleocurrent: to East

• Thickness: ca. 10 m
• Upper limit: Unconformity (Tama I Loam, Ome Formation, Nakadai Formation, Kumegawa Formation)
• Lower limit: Unconformity (Sayama Formation)

• Distribution: Imokubo, Higashiyamato city, Tokyo; Ishihata park, Ishihata, Mizuho city, Nishitama county, Tokyo

• Suzuki et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.343-356, DOI
• 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.)