Sequence IV

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Sequence IV

Invalid synonym: Stage III

Volcanic rocks
Caldera
Late Cretaceous - Paleogene (ca. 65 Ma)

Lithofacies: Pyroclastic flow deposit
Lithofacies: Rhyolite welded tuff

Sequence IV (central Mikkaichi, Gifu pref.)
[ Upper ]
~~~~~~~~~~~~~~
Akadani Welded Tuff
~~~~~~~~~~~~~~
Tsumetadani Formation
~~~~~~~~~~~~~~
[ Lower ]

Sequence IV (eastern Mikkaichi, Gifu pref.)
[ Upper ]
~~~~~~~~~~~~~~
Genjidake Welded Tuff
~~~~~~~~~~~~~~
Mikkamachi Formtion
~~~~~~~~~~~~~~
[ Lower ]

Sequence IV (Takayama, Gifu pref.)
[ Upper ]
~~~~~~~~~~~~~~
Kuzogawa Welded Tuff
~~~~~~~~~~~~~~
Aoya Tuff
~~~~~~~~~~~~~~
[ Lower ]

Sequence IV (Southern area)
[ Upper ]
~~~~~~~~~~~~~~
Uguigawa Welded Tuff
--------------
Mayumitoge Welded Tuff
~~~~~~~~~~~~~~
Takadaru Welded Tuff
--------------
Atera Formation
--------------
[ Lower ]

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

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

Distribution: Gifu pref. - Fukui pref. - Toyama pref.

Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)
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.)