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Shiomidai Formation Ishii et al., 1983

• Type locality: Shiomidai, Shichigahama city, Miyagi county, Miyagi prefecture
• Coherent formation
• middle Miocene (Diatoms)
• Correlation: Neko Formation, Lower Member

• Sedimentary facies: Marine
• Lithofacies: Sandstone
• Lithofacies (Basal): Conglomerate
• Sedimentary structures: Cross stratificaiton

• Thickness: ca. 15 m
• Thickness (Basal): ca. 0.5 - 1 m
• Lower limit: Unconformity (Toguhama Formation, Siltstone Member)

• Distribution: Shiomidai - Shiomi - Nibusawatsutsumi, Shichigahama city, Miyagi county, Miyagi pref.
• Fossils: Sponges (Aphrocallistes sp.)

• 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.)