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Toshima Sand and Gravel Member

• Coherent formation
• middle Pleistocene

• Sedimentary facies: Seashore, Offshore - Shoreface facing open sea
• Lithofacies: Interbedded sands and gravels
• Sedimentary structures: Parallel stratification

• Upper limit: Unconformity (Sugiyama Sand Member, Tonami Gravel Member)
• Lower limit: Conformity (Akasawa Mud Member), Unconformity (Ikobe Gravel Member, Arai Mud Member, Hosoya Sand Member, Nanane Sandy Mud Member)

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

• Distribution: west coast of Lake Hamana, Kosai city, Shizuoka pref. - Atsumi peninsula, Aichi pref.
• Tephra: At-4

• Nakashima et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.2, pp.70-79 DOI