Nihongi Formation

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Nihongi Formation

Volcanic rocks
Caldera
Late Cretaceous - Paleogene

Lithofacies: Vitreous rhyolite tuff, Crystalline tuff, Pumice tuff, Tuffaceous sandstone, Shale, Conglomerate

Thickness: ca. 300 m
Upper limit: Unconformity (Hikodani Welded Tuff)
Lower limit: Unconformity (Mugishima Granite)

Sequence II (Lake Miboroko, Gifu pref.)
[ Upper ]
~~~~~~~~~~~~~~
Nihongi Formation
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Odorigawa Formation
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Ojirakawa Formation
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[ Lower ]

Sequence II (western Mikkaichi, Gifu pref.)
[ Upper ]
~~~~~~~~~~~~~~
Odorigawa Formation
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[ Lower ]

Sequence II (central Mikkaichi, Gifu pref.)
[ Upper ]
~~~~~~~~~~~~~~
Nihongi Formation / Koidodani Formation
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[ Lower ]

Sequence II (Southern area)
[ Upper ]
~~~~~~~~~~~~~~
Ako Welded Tuff
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Kumuro Welded Tuff
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Kasuri Conglomerate
~~~~~~~~~~~~~~
[ Lower ]

Nohi Rhyolites
[ Upper ]
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Sequence VI
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Sequence V
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Sequence IV
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Sequence III
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Sequence II
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Sequence I
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[ Lower ]

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

Distribution: Nihongi - Mitadani valley - Hikodani valley - Nakanose, Kiyomi town, Takayama city, Gifu pref.
Fossils (Plants): Cunninghamia izumiensis

Kawada et al. (1988) Geology of the Hagiwara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 82p. (in Japanese with English abstract 10p.)
Yamada et al. (1985) Geology of the Takayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 9p.)
Kawada (1982) Geology of the Mikkamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 72p. (in Japanese with English abstract 6p.)