Okamura Formation

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Okamura Formation (Takahashi, 1958) Aoya et al., 2013

Type locality: Okamura, Komatsu town, Saijo city, Ehime prefecture
Coherent formation
early Pliocene (1.4 Ma, Tephra)

Sedimentary facies: Fluvial, small scale Lacustrine
Lithofacies: Conglomerate
Lithofacies (Minor): Sandstone, Silt

Thickness: 70 m or thicker

Okamura Formation
[ East ]
?--?--?--?--?-
Toyanohana Gravel Member
?--?--?--?--?-
Takihama Gravel Member
?--?--?--?--?-
[ West ]

Second Setouchi Supergroup (Ehime pref.)
~~~~~~~~~~~~~~
Okamura Formation
Gunchu Formation
Yakura Formation
Torinoko Formation
Miaki Formation
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[ Upper ]
~~~~~~~~~~~~~~
Second Setouchi Supergroup
?--?--?--?--?-
First Setouchi Supergroup
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Okamura - Kurumi - Haigawa, Saijo city, Ehime pref.; Hagyu - Takihama, Niihama city, Ehime pref.; Ueno - Kobayashi - Okado - Kamigashiwa - Kanagawa, Shikokuchuo city, Ehime pref.
Fossils (Plants): Metasequoia disticha, Picea koribai
Tephra: Okamura

Kawamura and Nishiyama (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.87-105 DOI
Ikeda et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.7, pp.445-470 DOI
Aoya et al. (2013) Geology of the Niihama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 181p. (in Japanese with English abstract 3p.)