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Sakuma Formation

Invalid synonym: Sakuma Group

• Coherent formation
• Forearc basin sediments
• Miocene
• Correlation: Kinone Formation
• Correlation (Upper): Kanigawa Formation
• Correlation (Lower): Tomiyama Formation, Fukawa Formation

• Sedimentary facies: Marine
• Lithofacies: Conglomerate
• Lithofacies (Eastern, Kanigawa Formation): Argillaceous sandstone

• Upper limit: Lithofacies boundary
• Lower limit: Unconformity (Hota Group)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Northern Boso peninsula, Chiba pref.

• Takahashi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.8, pp.375-395, DOI
• Sawada et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.5, pp.206-222 DOI
• Suzuki et al. (1990) Geology of the Nago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 3p.)