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Pre-Sotoizumi Group (Tashiro and Ikeda, 1987) Tanaka et al., 1998

• Coherent formation
• Cretaceous

• Sedimentary facies: Marine

• Upper limit: Unknown
• Lower limit: Unknown

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

• Distribution: Kumamoto pref.
• Fossils: Tethyan
• Fossils (Bivalves): Pterotrigonia hokkaidoana

• Miyake et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.12, pp.447-462, DOI
• Terabe and Matsuoka (2009) Jour. Geol. Soc. Japan, vol.115, no.3, pp.130-140 DOI