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Upper Member

• Type locality: Sekiba, Osato city, Kurokawa county, Miyagi prefecture
• Coherent formation
• Miocene

• Lithofacies: Sandstone
• Lithofacies (Minor): Tuff
• Sedimentary structures: Trough cross-stratification

• Thickness: ca. 80 - 140 m or thicker
• Upper limit (Omatsuzawa Formation): Top of the sandstone showing cross stratification
• Upper limit: Conformity (Omatsuzawa Formation)
• Lower limit: Transitional (Lower Member), Unconformity (Kashimadai Formation, Hataya Formation)

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

• Distribution: Sekiba - Mount Bangamori, Osato city, Kurokawa county, 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.)