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Izumiyatsu Member (Aoki, 1967) Tokuhashi and Endo, 1983

• Coherent formation
• Pleistocene

• Sedimentary facies: Marine
• Sedimentary facies: Inner bay
• Lithofacies: Muddy sands, Sandy mud

• Thickness: 1 - 2 m

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

• Distribution: Chiba pref.
• Fossils: Trace fossils
• Fossils (Shellfishes): Calithaca adamsi, Cryptomya busoensis, Dosinia cf. angulosa, Lucinoma annulata, Macoma incongrua, Mactra sulcataria, Mya japonica, Panope japonica, Patinopecten tokyoensis, Raeta yokokamensis, Solen krusensterni, Venericardia ferruginea
• Fossils (Foraminifera): Buccellafrigida nipponica, Elphidium sp., Nonionella stella, Rotalia japonica
• Tephra: J1

• Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
• Tokuhashi and Endo (1984) Geology of the Anesaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)