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Narimasu Formation (Kobayashi et al., 1968) Ueki and Sakai, 2007

Invalid synonym: Narimasu Terrace Deposit

• Type locality: Hinodai, Hino city, Tokyo, but it is impossible to observe now
• Coherent formation
• late Pleistocene (ca. 0.1 Ma)
• Correlation: Musashino Terrace Deposit, Oshika Gravel Bed

• Sedimentary facies: Fluvial
• Lithofacies (Top): Silt, Sands
• Lithofacies: Gravels
• Sedimentary structures: Imbricate structure

• Thickness: 4 - 8 m
• Upper limit: Unconformity (Shimosueyoshi Loam)
• Lower limit: Unconformity (Tokorozawa Formation, Kazusa Group)

• Distribution: Hinodai - Shinmachi - Honcho - Asahigaoka, Hino city, Tokyo; Kasumigawa river, Imadera, Ome city, Tokyo; Ishikawa town, Hachioji city, Tokyo; Kamiyaganuki, Iruma city, Saitama pref.
• Tephra: On-Pm1

• Ueki et al. (2013) Geology of the Hachioji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 137p. (in Japanese with English abstract 6p.)
• 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.)