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Shimomidani Formation

There are opinions that this formation belongs to Maizuru Belt or Akiyoshi Belt

• Type locality: Shimomidani, Maizuru city, Kyoto prefecture
• Accretionary complex
• Deposition: early - middle Permian
• Intruded by: Oeyama Mass

• Sedimentary facies: Marine
• Lithofacies: Mudstone
• Lithofacies (Minor): Felsic tuff, Conglomerate, Sandstone, Chert
• Lithofacies: Mélange facies, Coherent facies

• Thickness: 1,000 m or thicker
• Thickness (Middle): 600 m
• Thickness (Upper): 1,000 m or thicker
• Upper limit: Unconformity (Hannyaji Formation)

• Distribution: Shimomidani - Okadayuri - Saihoji - Kora - Mount Akaiwayama - Iwao- Kamiurushibara - Jito, Maizuru city, Kyoto pref.; Takatsu - Sogo - Futamata - Naiku, Oe town, Fukuchiyama city, Kyoto pref.; Hidono - Hata - Tokonoo, Tanto, Toyooka city, Hyogo pref.
• Fossils (Radiolarians): Pseudoalbaillella aff. longicornis, Entactinia itsukaichiensis, Ishigaum spp., Cauletella sp., Latentifistula? sp., Latentibifistula? sp., Quadricaulis cf. inflata, Ormistonella cf. adhaerens

• Sugamori (2013) Jour. Geol. Soc. Japan, vol.119 no.5, pp.368-374 DOI
• Igi and Kuroda (1965) Oeyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 81p. (in Japanese with English abstract 12p.)