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Tatsugami Formation Mori, 1949
- Type locality: Nagashioya - Shirahama, Kitakami town, Ishinomaki city, Miyagi prefecture
- Coherent formation
- Early Cretaceous
- Sedimentary facies: Brackish (Bivalves)
- Lithofacies: Interbedded sandstone and mudstone
- Sedimentary structures: Cross stratification, Dish structures, Channel structures, Slump structures
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nagashioya - Shirahama - Tatsugami, Kitakami town, Ishinomaki city, Miyagi pref.
- Fossils (Bivalves): Corbula? sp., Crenotrapezium kitakamiensis, Cuspidaria? sp., Filosina jusanhamensis, Protocardia morii
- Takizawa et al. (1990) Geology of the Toyoma District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 126p. (in Japanese with English abstract 8p.)