Takahoriyama Formation

[ Top ] [ Japanese ]

Takahoriyama Formation

Type locality: Mount Takahoriyama, Kawamoto city, Ochi county, Shimane prefecture
Volcanic rocks
late Eocene
Intruded by: Felsic rock dikes, Rhyolite dikes, Porphyrite dikes

Lithofacies: Biotite rhyolite welded tuff, Lapilli tuff, Pyroxene dacite tuff, Lapilli tuff
Lithofacies (Basal): Tuffaceous sandstone, Conglomerate

Thickness: ca. 800 m
Upper limit: Conformity, partly unconformity (Nakano Formation)
Lower limit: Unconformity (Yadani Formation)

Sakurae Group
[ Upper ]
~~~~~~~~~~~~~~
Nakano Formation
--------------
Takahoriyama Formation
~~~~~~~~~~~~~~
[ Lower ]

Tamagawa stage volcanic rocks (Shimane pref.)
[ Young ]
~~~~~~~~~~~~~~
Sakurae Group
~~~~~~~~~~~~~~
Kotani Formation
~~~~~~~~~~~~~~
Kawamoto Granodiorite
~~~~~~~~~~~~~~
Komatsuji Formation
~~~~~~~~~~~~~~
Toburodani Formation
~~~~~~~~~~~~~~
[ Old ]

Sanin Belt
[ Young ]
~~~~~~~~~~~~~~
Tamagawa stage volcanic rocks
~~~~~~~~~~~~~~
Younger Inbi stage intrusive rocks
?--?--?--?--?-
Older Inbi stage intrusiv rocks
?--?--?--?--?-
Inbi stage volcanic rocks
~~~~~~~~~~~~~~
Mochigase stage intrusive rocks
?--?--?--?--?-
Mochigase stage volcanic rocks
~~~~~~~~~~~~~~
[ Old ]

------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Takahorigawa river - Inugatani, Kawamoto city, Ochi county, Shimane pref.; Mount Takahoriyama, Onan city, Ochi county, Shimane pref.

Kano et al. (2001) Geology of the Yunotsu and Gotsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 129p. (in Japanese with English abstract 5p.)
Matsuura (1990) Geology of the Akana District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 5p.)