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Takayashiki Unit (Shirai, 1952 ex Sugimoto, 1974)
Invalid synonym: Takayashiki Formation
- Type locality: Tayashiki - Ohira, Iwaizumi city, Akka, Shimohei county, Iwate prefecture
- Accretionary complex
- Deposition (Limestone): middle Permian (Fusulinids)
- Deposition (Chert): Late Triassic, Carnian - Norian (Conodonts)
- Deposition (Limestone): Late Jurassic (Corals, Stromatoporoids)
- Deposition (Clastic rocks): Late Jurassic, Oxfordian (Ammonoids)
- Intruded by: Tsukanaigawa Pluton
- Sedimentary facies: Marine
- Lithofacies (Upper): Mélange facies
- Lithofacies (Lower): Brocken facies
- Matrix (Upper): Mudstone with minor Conglomerate
- Exotic blocks (Upper, Slabs): Chert, Sandstone, Basalt, Limestone
- Lithofacies (Lower): Interbedded sandstone and mudstone
- Lithofacies (Lower, Minor): Chert, Siliceous mudstone, Mudstone, Mafic rocks
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tayashiki - Ohira - Tachiusu - Matsugasawa, Akka, Iwaizumi city, Shimohei county, Iwate pref.; Kawai - Seki, Yamagata town, Kuji city, Iwate pref.; Uchimagi, Yamane town, Kuji city, Iwate pref.; Osanai river, Kuji city, Iwate pref.; Kamidate - Hebiguchi, Karumai city, Kunohe county, Iwate pref.
- Fossils: Ammonoids (Perisphinctes sp.), Corals, Sponges (Spicules)
- Fossils (Limestone): Crinoids, Corals, Bivalves, Fusulinids (Neoshwagerina sp., Verbeekina sp.), Stromatoporoids
- Fossils (Chert): Conodonts
- Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)
- Takahashi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.1, pp.1-22, DOI
- Ehiro et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.121-139 DOI