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Ojoin Formation Kojima et al., 1956

Invalid synonym: Tomisato Formation

• High P/T metamorphic rocks
• Metamorphism (Upper): Early Cretaceous (120 - 110 Ma)
• Correlation: Besshi Unit (after Aoki, 2019)

• Lithofacies: Pelitic schist
• Lithofacies (Minor): Greenschist, Siliceous schist, Calcareous schist

• Lower limit: Thrust fault

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

• Distribution: Mount Omoriyama - Mount Tamatoriyama, Shikokuchuo city, Ehime pref.

• Endo and Yokoyama (2019) Geology of the Motoyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 100p. (in Japanese with English abstract 4p.)
• Otoh et al. (2010) Jour. Geol. Soc. Japan, vol.119, No.2, pp.333-346 DOI
• Okamoto et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.37-49 DOI
• Kojima and Mitsuno (1966) Kawaguchi, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 17p. (in Japanese with English abstract 7p.)
• Doi (1964) Mishima, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 31p. (in Japanese with English abstract 6p.)