Koidodani Formation

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Koidodani Formation

Volcanic rocks
Caldera
Late Cretaceous - Paleogene

Lithofacies: Pumice tuff, Pumiceous tuff breccia, Tuffaceous sandstone

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

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

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

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

Sequence II (Southern area)
[ Upper ]
~~~~~~~~~~~~~~
Ako Welded Tuff
~~~~~~~~~~~~~~
Kumuro Welded Tuff
~~~~~~~~~~~~~~
Kasuri Conglomerate
~~~~~~~~~~~~~~
[ 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: Koidodani valley, Kiyomi town, Takayama city, Gifu pref.; Mazegawa river, Takayama city, Gifu pref.

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.)