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Oginohama Formation (Fukada, 1951) Takizawa et al., 1974
Invalid synonym: Oginohama Group, Kozumi Group
- Type locality: Oginohama, Ishinomaki city, Miyagi prefecture
- Coherent formation
- Middle Jurassic, Callovian - Late Jurassic, Oxfordian (Ammonoids)
- Sedimentary facies (Top): Marine
- Sedimentary facies (Upper): Shallow marine
- Sedimentary facies (Lower): Fluvial
- Sedimentary facies (Bottom): Marine
- Lithofacies: Interbedded sandstone and shale
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Oginohama - Makinosaki - Aji island, Kobuchi - Shirahama - Kukunarihama, Ishinomaki city, Miyagi pref.
- Fossils (Ammonoids): Ataxioceras sp., Perisphinctes sp., Virgatosphinctes aff. communis
- Takizawa et al. (1987) Geology of the Yoriiso District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 5p.)
- Takizawa et al. (1984) Geology of the Ishinomaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 7p.)
- Takizawa et al. (1974) Geology of the Kinkasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 62p. (in Japanese with English abstract 5p.)