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Pre-Sotoizumi Group (Tashiro and Ikeda, 1987) Tanaka et al., 1998
It distributes in Kurosegawa Belt in the geographical point of view.
- Coherent formation
- Cretaceous
- Sedimentary facies: Marine
- Upper limit: Unknown
- Lower limit: Unknown
- Pre-Sotoizumi Group (Oita pref.)
- [ Upper ]
- ?--?--?--?--?-
- Sukubo Formation
- ?--?--?--?--?-
- [ Lower ]
- 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