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Katsumi Formation
- Sedimentary facies: Marine
- Lithofacies (Upper): Slate, Chert
- Lithofacies (Middle): Slate
- Lithofacies (Middle, Minor): Greenstones, Sandstone, Limestone
- Lithofacies (Lower): Interbedded slate and sandstone
- Lithofacies (Lower, Minor): Chert
- Thickness: 3,500 m or thicker
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Uchitomi peninsula - Mount Kusuyagatake, Obama city, Fukui pref.; Wakasa city, Mikatakaminaka county, Fukui pref.; Akagurisaki, Oshima, Oi city, Oi county, Fukui pref.
- Fossils (Limestone, Fusulinids): Pseudoschwagerina sp.
- Sugamori et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.21-36 DOI
- Hirokawa and Kuroda (1957) Nokogirizaki, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 22p. (in Japanese with English abstract 9p.)