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Iwaizaki Formation Kameda, 1993

Invalid synonym: Iwaizaki Limestone

• Type locality: Cape Iwai, Kesennuma city, Miyagi prefecture
• Coherent formation
• Permian
• Correlation: Kamiyasse Formation, Kanokura Formation

• Sedimentary facies: Marine
• Lithofacies: Limestone, Slate
• Lithofacies (Minor): Sandstone
• Sedimentary structures: Trough cross-stratification

• Thickness: 199 m or thicker

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Cape Iwai, Kesennuma city, Miyagi pref.
• Fossils: Trilobites (Paradin yanagisawai, Pseudophillipsia obtusicauda), Crinoids, Bryozoans, Avlosieges sp., Geyerellla sp.
• Fossils (Cephalopods): Foordiceras akiyamai, Propinacoceras aff. galilaei, Stacheoceras iwaizakiense, Tainoceras abukumensis
• Fossils (Shellfishes): Amblysiphonella sp., Aviculopecten sp., Bellerophon sp., Dentalium herculeum, Fenestella sp., Protteyris sp., Sanguinolites cf. plicatus, Wentselella cf. indicum
• Fossils (Brachiopods): Camarophoria humbletonensis, Derbyia cf. magnifica, Dielasma sp., Leptodus richthofeni, Martinia sp., Meekella gigantea, Neospirifer fasciger, Orthotetina sp., Richihofenia japonica, Rhynchonella sp.
• Fossils (Fusulinids): Codonofusiell sp., Monodiexodina matsubaishi, Parafusulina chiksiaensis, Parafusulina hisamatsui, Parafusulina cf. licornis, Parafusulina matsubaishi, Pseudofusulina gregaria, Pseudofusulina hashigamiensis, Pseudofusulina cf. hunania, Pseudofusulina iwaizakiensis, Pseudofusulina kiyoharai, Pseudofusulina motoyoshiensis, Pseudofusulina nobilis, Pseudofusulina paramotohashii, Pseudofusulina paramotohashii var. oyaensis, Pseudofusulina paratschernyschiewi, Rauserella sp., Schwagerina paragumbeli, Schwagerina shinadai, Verbeekina sp., Yabeina shiraiwensis
• Fossils (Corals): Colaniella sp., Iranophyllum cf. splendes, Pseudophillipsia obtusicauda, Waagenophyllum cf. indicum, Wentzelella elegans, Wentzelella aff. iimorica, Wentzelella iwaizakiensis, Wentzelella aff. paracanalifera, Wentzelella persica var. minor, Yatsengia aff. ariatica, Yatsengia kiangsuensis, Yatsengia kiangsuensis var. mabutii

• Kamada (1993) Geology of the Tsuya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)