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Sekibutsu Tuff Member (Shimakura, 1963) Ozaki et al., 2000

Marginal facies of Muro Pyroclastic Flow Deposit

Invalid synonym (Upper): Nakanokawa Member

• Type locality: Sekibutsu, Jigoku valley, Kasugano town, Nara city, Nara prefecture
• Volcanic rocks
• Miocene (16 - 14.4 Ma, FT)
• Correlation: Tamateyama Tuff Bed

• Lithofacies: Pyroclastic flow deposit (One or multiple flow units)
• Lithofacies (Upper): Felsic tuff, Tuffaceous siltstone
• Lithofacies (Lower): Felsic pumice volcanic lapilli tuff, Felsic tuff
• Lithofacies (Minor): Sandstone, Conglomerate
• Sedimentary structures: Parallel stratification, Cross stratification

• Thickness: 20 - 50 m
• Thickness (Upper): 5 - 15 m
• Thickness (Lower): 15 - 30 m
• Upper limit: Unconformity (Kasugayama Formation)
• Lower limit: Unconformity (Onigatsuji Mudstone and Sandstone Member, Yadahara Conglomerate Member)

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

• Distribution: Jigoku valley - Sekibutsu, Kasugano town, Nara city, Nara Nara pref.; Nakanokawa town, Nara city, Nara pref.; East foot, Mount Kasuga, Nara city, Nara pref.; Myoga, Nara city, Nara pref.; Kaseyama, Kizukawa city, Kyoto 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
• Shinjoe et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.8, pp.447-452 DOI
• Iwano et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.427-432 DOI
• Yamashita et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.7, pp.340-352 DOI
• Iwano et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.7, pp.326-339 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.)