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Kogoshio Formation

• Coherent formation
• Jurassic, ? - Late, Tithonian (Ammonoids)
• Correlation: Kobitawatashi Sandstone and Shale Member

• Sedimentary facies: Marine
• Lithofacies: Sandstone, Slate, Interbedded sandstone and slate, Conglomerate

• Thickness: ca. 800 m
• Upper limit: Unconformity (Kanaigaura Formation, Senganda Formation, Matsuzaki Formation)

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

• Distribution: Kesennumaoshima island - Godantara, Kesennuma city, Miyagi pref.
• Fossils: Ammonoids (Substeueroceras sp.)
• Fossils (Shellfishes): Astarte cf. elegans, Trigonia cf. formosa, Myophorella (Pramyophorella) obsolete, Myophorella (Promyophorella) orientalis

• Kambe and Shimazu (1961) Kesennuma, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 16p.)