Otonoyama Formation

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Otonoyama Formation Iida, 1980

Invalid synonym: Aodani Formation

Type locality: Iwayama, Ujitawara city, Tsuzuki county, Kyoto prefecture
Coherent formation
Pliocene - Pleistocene
Correlation: Nango Gravels and Clays Member

Sedimentary facies: Fluvial, Lacustrine
Lithofacies: Gravels
Lithofacies (Minor): Silt, Sands

Thickness: ca. 20 - 60 m
Upper limit: Conformity (Zenjoji Formation, Nagaike Formation)
Lower limit: Conformity (Ofuku Gravels Member), Unconformity (Okuyamada Formation, Granitoids, Tamba Belt)

Osaka Group (Uji, Kyoto pref.)
[ Upper ]
~~~~~~~~~~~~~~
Fukakusa Formation
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Nagaike Formation
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Zenjoji Formation
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Otonoyama Formation
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Tomigaoka Formation
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[ Lower ]

Second Setouchi Supergroup (Osaka pref. - Hyogo pref.)
[ Upper ]
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Osaka Group
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[ Lower ]

[ Upper ]
~~~~~~~~~~~~~~
Second Setouchi Supergroup
?--?--?--?--?-
First Setouchi Supergroup
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Iwayama - Ofuku - Yuyadani - Tachikawa - Gonokuchi - Meijodai, Ujitawara city, Tsuzuki county, Kyoto pref.; Amagase, Uji city, Kyoto pref.; Sekinotsu, Otsu city, Shiga pref.; Odawara - Ryumon - Sotohata town - Sotsuka, Oishi, Otsu city, Shiga pref.
Fossils (Plants): Cyclocarya paliurus, Juglans megcinerea, Metasequoia sp., Pseudotsuga sp.
Tephra: Iwayama

Wakita et al. (2013) Geology of the Kyoto-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 124p. (in Japanese with English abstract 3p.)