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Nishikori Formation Ueda, 1963
Invalid synonym: Maiya Formation, Rodai Formation
- Type locality: Kamizaigo, Nishikiori, Towa town, Tome city, Miyagi prefecture
- Coherent formation
- Permian
- Correlation: Sakamotozawa Formation
- Sedimentary facies: Shallow marine
- Lithofacies: Shale, Limestone
- Lithofacies (Minor): Sandstone, Fesic tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kamizaigo, Nishikiori, Towa town, Tome city, Miyagi pref.; Satetsu river - Geibi valley - Mount Takauto - Takenosawa - Jumonji - Furudo - Miyagawa - Mount Takekura - Mount Mishima, Ichinoseki city, Iwate pref.; Yamada - Doya, Toyoma town, Tome city, Miyagi pref.
- Fossils (Limestone): Cepharopods (Metacoceras sp., Tylonautilus cf. permicus), Trilobites (Phillipsia sp., Pseudophillipsia sp.), Crinoids, Bryozoans (Fenestella sp.)
- Fossils (Limestone, Bivalves): Acanthopecten spinosus, Actinodontophora katsusensis, Aviculopecten cf. reticularis, Conocardium sp., Cypricardinia? sp., Deltopecten sp., Hormotomia sp., Mustima sp., Myalina sp., Myophoria subelegans var. tobai, Mytiliopsis sp., Nuculopsis sp., Ostrea sp., Parmophorella sp., Pharkidontus sp.
- Fossils (Limestone, Gastropods): Metoptoma? sp., Pleurophorus sp.
- Fossils (Limestone, Brachiopods): Chonetes sp., Derbya hemispherica, Dictyoclostes sp., Hustedia sp., Leptodus sp., Linoproductus cf. cora, Marginifera typica, Rhynchonella sp., Spiriferina cristata
- Fossils (Limestone, Corals): Iranophyllum permicum, Lophophyllidium sp., Michelinia (Protomichelinia) multitabulata, Wentzelella kitakamiensis, Yatzengia kabayamaensis
- Fossils (Limestone, Fusulinids): Chalaroschwagerina sp., Codonofusiella paradoxica, Eoverbeekina cheni, Nagatoella minatoi, Nankinella discoides, Ozawainella delawarensis, Parafusulina complicata, Parafusulina cf. crassiseptata, Parafusulina japonica, Parafusulina cf. kaerimizuensis, Parafusulina cf. kattensis, Parafusulina richthofeni, Pseudofusulina aganoensis, Pseudofusulina ambigua, Pseudofusulina craffti, Pseudofusulina incissa, Pseudofusulina multiseptata, Pseudofusulina staffi, Pseudofusulina verneuili var. solida, Pseudofusulina vulgaris var. globosa, Pseudoschwagelina (Pseudoschwagerina) shellwieni, Pseudoschwagerina (Zellia) nunosei, Schwagerina crassa, Schwagerina linearis, Schwagerina cf. prisca var. parvula, Sphaerulina crassispira, Triticites cf. simplex, Triticites uddeni
- Fossils (Limestone, Algae): Macroporella maxima, Mizzia velebitana, Tentloporella sp.
- Fossils (Maiya flora, Ferns): Aphlebia sp., Callipteridium sp., Cathaysiopteris whitei, Odontopteris subcrenulata, Odontopteris yongwolensis, Parasphenophyllum thonii var. minor, Paratrizygia maiyaensis, Paratrizygia uedae, Pecopteris toyomaensis, Psygmophyllum flabellatum, Psygmophyllum maiyaensis, Sphenopteris taiyuanensis, Taeniopteris arakawae, Taeniopteris laciniata, Taeniopteris latecostata, Taeniopteris linearifolia, Taeniopteris maiyaensis, Taeniopteris nystroemii, Taeniopteris oishii, Taeniopteris paradensissiama, Taeniopteris cf. schenkii, Taeniopteris setamaiensis, Taeniopteris thailandica, Trizygia oblongifolia
- Fossils (Maiya flora, Conifers): Cordaites (Noeggerathiopsis) japonicus, Cordaites palaeformis, Cordaites principales, Samaropsis? sp.
- 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.)
- 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.)