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Toyoma Formation Mabuchi, 1932
Invalid synonym: Toyoma Clayslate Formation, Futatsumori Formation
Takeuchi and Mikoshiba (2002) separated Usuginu Formation.
- Sedimentary facies: Marine
- Sedimentary facies: Inner bay
- Sedimentary facies: Turbidite
- Lithofacies (Upper): Sandstone
- Lithofacies (Middle): Mudstone, Slate
- Lithofacies (Lower): Siltstone, Sandy mudstone
- Lithofacies (Lower, Minor): Sandstone
- Sedimentary structures: Slump structures
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kitazawa - Kawabukuro - Minebatake, Toyoma town, Tome city, Miyagi pref.; Mount Hiryu, Tassobe, Miyamori town, Tono city, Iwate pref.; Mount Tsuchikura, Hanamaki city, Iwate pref.; Kawasaki town - Nanokamachi, Ichinoseki city, Iwate pref.; Asadanuki - Mizusakaitoge - Komekawa, Towa town, Tome city, Miyagi pref.; Naburi - Karakuwa - Mizuhama - Funakoshi - Mount Ishimine - Namiita, Ogatsu town, Ishinomaki city, Miyagi pref.; Futago island - Kuroshima island, Kotaki, Kitakami town, Ishinomaki city, Miyagi pref.
- Fossils (Nabekoshiyama fauna, Brachiopods): Lamnimargus japonicus, Leptodus richthofeni, Linoproductus? sp., Spirifer? sp.
- Fossils: Fishes (Helicampodus sp.), Trilobites?, Echinoids (Spicules), Scaphopods (Dentalium sp.), Crinoids, Foraminifera (Colaniella parva), Sponges, Bryozoan, Jellyfishes (Paraconularia shiitai <= Conularia sp.)
- Fossils (Cephalopods): Araxoceras cf. kiangsiense, Artinskia sp., Domatoceras ogatsuense sp., Eumedlicottia sp., Foordiceras cf. wynneri, Metacoceras sp., Protocycloceras cf. cyclophorum, Rotodiscoceras sp., Stacheoceras cf. trimurti, Xenodiscus cf. carbonarius
- Fossils (Bivalves): Allorisma regularis, Anthraconeilo sp., Astortella toyomensis, Auriptygma sp., Aviculopecten sp., Cardinia sp., Coeloconus? sp., Cypricardinia sinensis, Edomondia nystromi, Eoptychia sp., Leda sp., Lima sp., Myalina sp., Nucula sp., Nuculana sp., Nuculites kimurai, Nuculopsis hayasakai, Nuculopsis orientalis, Pachypora sp., Palaeolucina spp., Palaeoneilo hanzawai, Palaeoneilo ogachiensis, Palaeophalus sp., Parallelodon sp., Quadratonucula hataii, Schizodus sp., Yoldia sp.
- Fossils (Gastropods): Architectonica? sp., Bellerophon yabei, Calamites takahashii, Capulus? sp., Euomphalus sp., Euphemitopsis kitakamiensis, Kitakamispira hanzawai, Mourlonia toyomensis, Omphalotrochus sp., Palaeoneilo ogachiensis, Pleurotomaria sp., Straparolus sp., Worthenia sp.
- Fossils (Fusulinids): Lepidolina sp., Parafusulina sp., Pseudodoliolina sp., Schubertella sp., Schwagerina sp., Sumatrina sp., Yabeina sp.
- Fossils (Plants): Helicampodus sp., Neocalamites sp., Paracalamites sp., Pecopteris? sp.
- Fossils (Trace fossils): Chondrites isp., Helminthorida isp., Scalarituba isp., Taenidium isp. (<= Notaculites toyomensis)
- Ehiro and Morikiyo (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.47-67 DOI
- Takeuchi and Mikoshiba (2002) Geology of the Senmaya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 3p.)
- 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.)
- Kamada (1993) Geology of the Tsuya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)
- Kamada and Takizawa (1992) Geology of the Osu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 4p.)
- 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.)
- 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.)
- Takahashi and Matsuno (1969) Geology of the Wakuya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 26p. (in Japanese with English abstract 6p.)
- Matsuno (1967) Geology of the Wakayanagi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 24p. (in Japanese with English abstract 5p.)
- Kambe and Shimazu (1961) Kesennuma, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 16p.)
- Hirokawa and Yoshida (1956) Ohazama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 31p. (in Japanese with English abstract 9p.)
- Hirokawa and Yoshida (1954) Hitokabe, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 33p. (in Japanese with English abstract 14p.)