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Diatomaceous Siltstone Member Ishii et al., 1982

• Type locality: Asai, Higashimatsuyama city, Miyagi prefecture
• Coherent formation
• Miocene

• Sedimentary facies: Marine
• Lithofacies: Diatomaceous siltstone
• Lithofacies (Minor): Siltstone

• Thickness: ca. 30 m
• Upper limit: Conformity (Siltstone Sandstone Member), Unconformity (Mitsuya Formation)
• Lower limit: Conformity (Tuffaceous Sandstone Sandy Siltstone Member, Siltstone Member)

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

• Distribution: Asai - Nagane - Shukuura - Ono, Higashimatsuyama city, Miyagi pref.

• Ishii et al. (1982) Geology of the Matsushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 121p. (in Japanese with English abstract 9p.)