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Tamagawa Formation
- Coherent formation
- Ezo forearc basin
- Late Cretaceous, Santonian
- Sedimentary facies: Marine, Fluvial
- Sedimentary facies: Transgressive deposit
- Sedimentary facies (Upper): Estuary, Lagoon - Upper shoreface
- Sedimentary facies (Lower - Middle): Alluvial fan, Meandering river, Floodplain, Lacustrine
- Lithofacies (Upper): Interbedded conglomerate, sandstone and mudstone
- Lithofacies (Upper, Minor): Tuff, Coal
- Lithofacies (Middle): Sandstone
- Lithofacies (Lower): Basal conglomerate
- Sedimentary structures: Trough cross-stratification, Hummocky cross-stratification, Parallel stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tamagawa seashore, Noda city, Kunohe county, Iwate pref.
- Fossils: Sauropods, Crocodiles, Sharks (Oxyrhina sp.)
- Fossils (Turtles): family Adocus, family Trionychidae, family Lindholmemydidae, family Nanhsiungchelyidae
- Fossils (Shellfishes): Anomia sp., Architectonica sp., Brachidontes sp., Callista (Pseudamiantis) cfr. crenulatus, Callistina (Larma) sp., Caryocorbula sp., Corbicula sp., Crassostrea sp., Isognomon (Mytiloperna) sp., Lebernula sp., Leptosolen sp., Linearia sp., Modiolus sp., Phoradina? sp.
- Fossils (Plants): Brachyphyllum sp., Calpolithus sp., Cladophlebis sp., Nilssonia? sp.
- Fossils (Pollen): Abietineaepollentites sp., Aquilapollenites evanidus, Araucariacites limbatus, Deltoidospora cascadensis, Deltoidospora nodaense, Gleicheniidites laetus, Laevigatosporites haardti, Laevigatosporites ovatus, Lycopodiacidites hamulatis, Monocolpopollenites kyushuensis, Monocolpopollenites cf. universallis, Monosulcites epahros, Piceaepollenites saccellus, Retitricolpites vulgaris, Rugubivesiculites fluens, Stereisporites antiquosporites
- Umetsu et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.82-95 DOI
- Yoshida et al. (1987) Geology of the Rikuchu-Ono District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)
- Shimazu and Teraoka (1962) Rikuchu-Noda, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 53p. (in Japanese with English abstract 11p.)