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Lower part
- Type locality: Jigoku valley, Kasugano village, Nara city, Nara prefecture
- Volcanic rocks
- Pyroclastic flow deposit
- Miocene
- Lithofacies: Partly welded massive pyroclastic rocks
- Lithofacies: Tuff, Lapilli tuff, Tuff breccia
- Thickness: 40 m
- Upper limit: Unconformity
- Lower limit: Unconformity
- Lower part
- [ Upper ]
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- L3 Unit
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- L2 Unit
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- L1 Unit
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Jigoku valley, Kasugano village, Nara city, Nara pref.; Nakanokawa village, Nara city, Nara pref.; East of Mount Kasuga, Nara city, Nara pref.; West of Fujiwara, Nara city, Nara pref.; West of Suyama, Nara city, Nara pref.; Myoga, Nara city, Nara pref.
- Sato et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.6, pp.173-178, DOI
- Sato et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.53-69 DOI