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Iyo Unit Banno et al., 2010
Invalid synonym: Izushi Formation
- High P/T metamorphic rocks (ca. 360 degree C, 0.54 - 0.61 GPa)
- Deposition (Limestone): Late Triassic (Conodonts)
- Deposition (Basalt): Jurassic (ca. 155 Ma)
- Deposition (Gabbro): Jurassic (139 - 135 Ma, U-Pb)
- Protolith: Late Cretaceous (ca. 90 Ma, K-Ar)
- Metamorphism: Late Cretaceous (ca. 90 - 77 Ma, K-Ar)
- Correlation (Upper): Minawa Unit
- Correlation (Lower): Kawaguchi Formation, Koboke Unit
- Intruded by: Rhyolite - Dacite dikes
- Metamorphic facies (Lower): Chlorite zone
- Metamorphic facies: Pumpellyite-Actinolite facies, Epidote-Blueschist facies
- Lithofacies (Upper): Mafic schist
- Lithofacies (Upper, Minor): Siliceous schist, Psammitic schist, Meta-gabbro
- Lithofacies (Lower): Pelitic schist
- Lithofacies (Lower, Minor): Mafic schit, Psammitic schist, Siliceous schist, Calcareous schist
- Thickness: 3,500 m or thicker
- Thickness (Upper): ca. 700 - 1,650 m
- Thickness (Lower): ca. 400 - 1,200 m
- Upper limit: Thrust fault (Kikitsu Unit)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hizuchi - Noji - Mount Doganaru - Kawatsuji, Yawatahama city, Ehime pref.; Hijikawa river - Maoku - Tsubai - Nishimine - Nemotokoshitoge pass - Odagiwa - Iyonagahama town - Ikata town - Mount Saitoyama - Yamatogawa river - Kushu - Mount Harikiyama - Izumi - Mount Joshinyama - Isaki - MIyauchi - Hirobaya - Mount Kosenjisan - Kuronta - Kamisukai - Tadokoro, Ozu city, Ehime pref.; Kaminada, Iyo city, Ehime pref.
- Fossils (Calcareous schist, Conodonts): Epigondolella abneptis, Epigondollela multidentata
- Miyazaki (2024) Geology of the Iyo-Nagahama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 155p. (in Japanese with English abstract 5p.)
- Banno et al. (2010) Geology of the Ozu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 58p. (in Japanese with English abstract 2p.)