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Yagii Formation
- Coherent formation
- late Miocene (9.7, 9.1 Ma, FT)
- Sedimentary facies: Marine, non-Marine
- Sedimentary facies: Fan delta
- Lithofacies (Upper): Coarse-grained sandstone, Conglomerate
- Lithofacies (Lower): Interbedded sandstone and siltstone
- Lithofacies (Minor): Lignite
- Sedimentary structures: Cross-stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ara river, Yorii city, Saitama pref.
- Fossils: Rhinoceros gen. et sp. indet, Metasequoia sp. (Lignite)
- Tephra: Y-1, Y-2, Y-3, Y-4, Y-5, Y-6, Y-7, Y-8, Y-9 (9.6 Ma, FT)
- Kobayashi et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.11, pp.632-636 DOI
- Arai et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.5, pp.223-241 DOI
- Takahashi and Yanagisawa (2004) Jour. Geol. Soc. Japan, vol.110, no.5, pp.290-308.
- Makimoto and Takeuchi (1992) Geology of the Yorii District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)