Onigatsuji Mudstone and Sandstone Member

[ Top ] [ Japanese ]

Onigatsuji Mudstone and Sandstone Member Shimakura, 1963

Type locality: Onigatsuji, Nara city, Nara prefecture
Coherent formation
middle Miocene
Correlation: Shiraishi Formation

Sedimentary facies: Middle-scale lacustrine
Sedimentary facies (Upper): Debris flow deposit?
Lithofacies: Interbedded sandstone and mudstone
Lithofacies (Minor): Conglomerate, Lignite

Thickness: 20 - 30 m
Upper limit: Unconformity (Sekibutsu Tuff Member)
Lower limit: Transitional (Higashiyama Conglomerate Member), Unconformity

Jigokudani Formation (Nara, Nara pref.)
[ Upper ]
~~~~~~~~~~~~~~
Iimori Conglomerate Member
~~~~~~~~~~~~~~
Sekibutsu Tuff Member
~~~~~~~~~~~~~~
Onomi Conglomerate Member
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Onigatsuji Mudstone and Sandstone Member
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Higashiyama Conglomerate Member
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Hachibuse Conglomerate Member
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[ Lower ]

Jigokudani Formation (Sakurai, Nara pref.)
[ Upper ]
~~~~~~~~~~~~~~
Sekibutsu Tuff Member
~~~~~~~~~~~~~~
Yadahara Conglomerate Member
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Onigatsuji Mudstone and Sandstone Member
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Higashiyama Conglomerate Member
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Onigatsuji - Nakanokawa town - Sahogawa river - Mount Hanayama - Mount Wakakusayama - Jigokudani - Mausoleum of Emperor Kasuganomiya, Nara city, Nara pref.
Fossils: Plant leaf, Pollen, Diatoms

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.)