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Kokuzo Formation Nishioka et al., 2001
Invalid synonym: upper Iwabuchi Formation
- Type locality: Kokuzo town, Kokuzo city, Nara prefecture
- Coherent formation
- Miocene (17.9 Ma, FT)
- Sedimentary facies: Marine
- Sedimentary facies: Coastal
- Lithofacies (North): Sandstone, Conglomerate
- Lithofacies (South): Sandstone, Siltstone
- Sedimentary structures (South): Upward-fining, Channel structure, Parallel stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kokuzo town - Rokuyaon town - Iwaigawa river - Hachibuse town - Fujiwara town - Takahi town, Nara city, Nara pref.; Shirakawa dam - Toyoi town, Tenri city, Nara pref.
- Fossils (Shellfishes): Macoma sp., Paphia sp., Sanguinolaria minoensis, Turbo aff. coronatus coreensis, Vicaryella ishiiana
- Fossils (Pollen): Abies sp., Alnus sp., Artemisia sp., Carpinus-Ostrya sp., Carya sp., Fagus sp., Gramineae, Juglans sp., Picea sp., Pteridophyta, Quercus (Cyclobalanopsis) sp., Taxaceae-Cephalotaxaceae-Cupressaceae, Ulmus-Zelkova
- Fossils (Trace fossils): Ophiomorpha isp.
- Sato et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.53-69 DOI
- Nishioka et al. (2001) Geology of the Sakurai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 141p. (in Japanese with English abstract 5p.)