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Ajima Formation Ishiga et al., 1987

• Type locality: Sasayamagawa river, Sannan town, Tamba city - Tannan, Tambasasayama city, Hyogo prefecture
• Accretionary complex
• late Permian, Changhsingian (Radiolarians)
• Correlation: Inagawa Complex, Takatsuki Formation, Shinjo Formation

• Lithofacies: Coherent facies
• Lithofacies (Upper): Sandstone, Sandstone-dominant interbedded sandstone and shale
• Lithofacies (Lower): Interbedded sandstone and shale

• Thickness: ca. 1,000 m
• Distribution (East - West): 5 km
• Distribution (South - North): 0.5 - 5 km
• Upper limit: Unconformity (Oyamashimo Formation, Daijoji Conglomerate)
• Lower limit: Unconformity (Kamitaki Formation), Thrust fault (Fujioka Complex, Takashiroyama Formation)

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

• Distribution: Sasayamagawa river, Sannan town, Tamba city - Tannan, Tambasasayama city, Hyogo pref.; Kawashiro, Tambasasayama city, Hyogo pref.
• Fossils (Radiolarians): Nassellaria sp.

• Hayashi et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.9, pp.747-764 DOI
• Sugamori et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.21-36 DOI
• Kurimoto et al. (1993) Geology of the Sasayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)