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Oshinuma Formation Hatori and Juen, 1958

Invalid synonym: Oshinuma Sand and Gravel Formation

• Type locality: Oshinuma pass, Higashiikuta, Tama ward, Kawasaki city, Kanagawa prefecture
• Oshinuma transgression sediments
• Coherent formation
• Higher terrace deposit
• middle Pleistocene (MIS 10)
• Correlation: Fujisawa Formation, Nishine Formation

• Sedimentary facies: Fluvial
• Sedimentary facies: Fill strath terrace sediments (Sagami river)
• Sedimentary facies (Basal): Lag
• Lithofacies: Gravels
• Lithofacies (Minor): Peat
• Sedimentary structures: Cross stratification, Trace fossils (Boring shell)

• Thickness: 1 - 10 m
• Upper limit: Conformity (Tama II Loam), Unconformity (Soda Loam)
• Lower limit: Unconformity (Kazusa Group, Gotentoge 3 Terrace Deposit)

• Distribution: Oshinuma pass, Higashiikuta, Tama ward, Kawasaki city, Kanagawa pref.; Shimooyamada, Machida city, Tokyo; Tsurumaki, Tama city, Tokyo; Yarimizu, Hachioji city, Tokyo
• Tephra: Go1, Go2

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.)

Oka et al. (1984) Geology of the Tokyo-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)