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Jigokudani Formation (Makiyama, 1926) Kokawa, 1954

• Type locality: Jigokudani valley, Kasugano town, Nara city, Nara prefecture
• Coherent formation
• middle Miocene
• Correlation: Shiraishi Formation, Soni Formation

• Sedimentary facies: Fluvial
• Sedimentary facies: Valley-fill deposit
• Lithofacies:

• Thickness: 30 - 120 m
• Upper limit: Unconformity (Sonoha Conglomerate Member, Mikasa Andesite)
• Lower limit: Unconformity (Fujiwara Group)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Jigokudani valley, Kasugano town, Nara city, Nara pref.; Nakanokawa town - Onigatsuji - Myoga town, 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
• Ozaki et al. (2000) Geology of the Nara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 162p. (in Japanese with English abstract 5p.)