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Tsukinoura Formation Takizawa et al., 1974
Invalid synonym: Samuraihama Formation, Samuraihama Group, Kotaijima Formation
- Type locality: Tsukinoura - Samuraihama, Ishinomaki city, Miyagi prefecture
- Coherent formation
- Middle Jurassic
- Basal formation of Ojika Group
- Sedimentary facies: Marine
- Sedimentary facies: Transgressive deposit
- Lithofacies (Main): Shale
- Lithofacies (Lower): Sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tsukinoura - Samuraihama - Yokoura - Oura - Yoriiso - Tomari, Ishinomaki city, Miyagi pref.; Izushima island, Onagawa city, Oshika county, Miyagi pref.
- Fossils (Ammonoids): Normannites (Itinsaites) cf. itinsae, Parkinsonia sp., Stephanoceras cf. plicatissimum
- 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.)