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Isumigawa Shell Bed

• Coherent formation
• Holocene (9,435 - 7.011 calBP)

• Lithofacies: Muddy sand

• Distribution: Daisan - Oshime - Kuwata - Atero, Isumi city, Chiba pref.
• Fossils (Shellfishes): Arca boucardi, Babylonia japonica, Cerithidea (Cerithideopsilla) djadjariensis, Crassostrea gigas, Cyclina sinensis, Dosinella angulosa, Mya sp., Fulvia mutica, Glossaulax didyma, Omphalius rusticus, Ostrea denselamellosa, Penitella kamakurensis, Rapana venosa, Ruditapes philippinarum, Saxidomus purpurata, Scapharca broughtonii, Tegillarca granosa

• Utsunomiya and Ooi (2019) Geology of the Kazusa-Ohara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)