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Gonda Formation (Tanaka, 1955) Nagamori et al., 2003
Invalid synonym: Gonda Sandstone Conglomerate Member, Shinkyu Formation
It had been treated as a member of Shigarami Formation.
- Type locality: Daita river, Gonda, Shinshushin town, Nagano city, Nagano prefecture
- Coherent formation
- late Miocene - Pliocene
- Sedimentary facies: Marine
- Lithofacies: Sandstone
- Lithofacies (Minor): Mudstone, Conglomerate, Tuff
- Sedimentary structures: Graded bedding, Hummocky cross-stratification, Channel structure
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Daita river, Gonda, Shinshushin town, Nagano city, Nagano pref.; Shikakumen - Mount Sunahachi, Kinasa, Nagano city, Nagano pref.; Dojiri river, Kumeko bridge, Hatsuhiki, Ogawa city, Kamiminochi county, Nagano pref.; Sumomodaira, Ogawa city, Kamiimnochi county, Nagano pref.
- Fossils: Sharks (Isurus escheri)
- Fossils (Early Shigarami fauna): Anadara amicula, Corbicula sp., Glycymeris minochiensis, Ostrea gigas, Panomya simotomensis, Patinopecten yamasakii, Turritella cf. saishuensis
- Seki and Hoyanagi (2015) Jour. Geol. Soc. Japan, vol.121, no.8, pp.279-292, DOI
- Tanabe (2015) Jour. Geol. Soc. Japan, vol.121, no.8, pp.265-278, DOI
- Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)
- Nakano et al. (2002) Geology of the Shiroumadake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 105p. (in Japanese with English abstract 5p.)
- Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)