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Toyofusa Group (Naruse et al., 1951) Nakao et al., 1986

• Type locality: Chiba prefecture
• Coherent formation
• Landward slope basin of trench
• early - middle Pleistocene

• Sedimentary facies: Marine
• Depth of water: Middle - Upper bathyal (Foraminifera)
• Lithofacies: Shell-bearing interbedded sandstone and siltstone

• Thickness: ca. 1,000 m or thicker
• Lower limit: Abut unconformity (Minamiboso Group)

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

• Distribution: Chiba pref.

• Utagawa et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.11, pp.969-976 DOI
• Kawakami and Shishikura (2006) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 5p.)
• 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.)