Kitaoguni Formation

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Kitaoguni Formation

Type locality: Osawa river, Arakawa river, Oguni city, Nishiokitama county, Yamagata prefecture
Volcanic rocks
early Miocene (35.3, 23, 20.2 Ma, K-Ar)
Correlation: Budo Formation

Lithofacies: Biotite rhyolite lapilli tuff
Lithofacies (Minor): Volcanic conglomerate, Tuff breccia

Thickness: 50 - 200 m or thicker
Upper limit: Unconformity (Meganebashi Formation)
Lower limit: Unconformity (Hakonokuchi Formation)

Oguni, Yamagata pref.
[ Upper ]
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Takamine Formation
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Utsutoge Formation
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Yugoya Formation
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Numazawa Formation
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Myozawabashi Formation
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Meganebashi Formation
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Kitaoguni Formation
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[ Lower ]

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

Distribution: Arakawa river - Sakura, Oguni city, Nishiokitama county, Yamagata pref.

Yamanoi et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.5, pp.262-266 DOI
Yanagisawa and Yamamoto (1998) Geology of the Tamaniwa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)