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Siltstone Member Ishii et al., 1982

Invalid synonym: Minatohama Siltstone Member of Toguhama Formation

• Type locality: Otsuka, Higashimatsushima city, Miyagi prefecture
• Coherent formation
• Miocene
• Interfingered: Toguhama Formation

• Sedimentary facies: Marine
• Lithofacies: Siltstone
• Lithofacies (Minor): Sandstone, Tuffaceous sandstone, Pumice tuff, Dacite volcanic breccia
• Sedimentary structures: Pipe rocks

• Thickness: ca. 130 - 200 m
• Upper limit: Unconformity (Tuffaceous Sandstone Sandy Siltstone Member, Diatomaceous Siltstone Member), Unconformity (Mitsuya Formation, Shirasakayama Tuff Member, Shiomidai Formation)
• Lower limit: Interfingered (Toguhama Formation), Conformity (Matsushima Formation)

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

• Distribution: Otsuka - Naruse river - Miyato island - Karato island, Higashimatsushima city, Miyagi pref.; Nono island - Sabusawa island - Funairi island, Shiogama city, Miyagi pref.

• Ishii et al. (1983) Geology of the Shiogama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 6p.)
• 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.)