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Tenjinnoki Formation Onuki, 1956
- Sedimentary facies: Shallow marine
- Lithofacies: Sandy shale
- Lithofacies (Upper, Minor): Usuginu Conglomerate
- Lithofacies (Minor): Sandstone, Limestone (Coral reef), Calcareous shale, Silty slate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tenjinmae, Towa town, Tome city, Miyagi pref.; Idozawa, Ichihasama town, Kurihara city, Miyagi pref.; Yamada - Doya, Toyoma town, Tome city, Miyagi pref.
- Fossils: Cephalopods (Paraceltites sp., Stenopoceras japonicum), Trilobites (Anisopyge sp., Phyllipsia sp., Pseudophyllipsia sp.), Gastropods, Crinoids, Fusulinids (Parafusulina matsubaishi <= Monodiexodina matsubaishi), Bryozoans (Fenestella sp., Polypora sp.), Trace fossils
- Fossils (Bivalves): Acanthopecten cf. carboniferus, Acanthopecten spinosus, Aviculopecten cf. reticularis, Conocardium sp., Crypricardinia sp., Deltopecten cf. giganteus, Mytilops sp., Myolina sp. Myophoria subelegans var. tobai, Ostrea sp., Parallerodon sp., Pseudolimea? sp., Tylotoma cristana
- Fossils (Brachiopods): Horridonia cf. horrida, Hustedia sp., Leptodus sp., Martinia typica, Martiniopsis cf. chidernensis, Productus gruenwaldti, Pteria sp., Richthofenia japoica, Rhynchonella sp., Spiriferina cristata, Squamularia sp. Terebatuloidea sp.
- Fossils (Limestone gravels): Fusulinids (Yabeina sp.), Corals (Waagenophyllum sp., Wentzelella sp.)
- Takeuchi and Kaneko (1996) Geology of the Shizugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
- 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.)