Yadani Formation

Type locality: Yadani, Kawamoto city, Ochi county, Shimane prefecture
Volcanic rocks
Late Cretaceous
Intruded by: Onbara Granite

Lithofacies: Pyroxene-bearing hornblende biotite dacite - Rhyolite welded tuff
Lithofacies (Minor): Biotite rhyolite welded tuff, Tuffaceous sandstone, Conglomerate

Thickness: 1,000 m or thicker
Upper limit: Unconformity (Takahoriyama Formation)
Lower limit: Conformity (Ichiibara Formation), Unconformity (Tsunotani Formation)

Ochi Group
[ Upper ]
--------------
Yadani Formation
--------------
Ichiibara Formation
--------------
[ Lower ]

Mochigase stage volcanic rocks
?--?--?--?--?-
Hikimi Group
?--?--?--?--?-
Abu Group
?--?--?--?--?-
Ochi Group
?--?--?--?--?-
Yakumo Volcanic Rocks
?--?--?--?--?-

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 ]

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

Distribution: Yadani, Kawamoto city, Ochi county, Shimane pref.; Take - Hibira - Tsugayuki, Misato city, Ochi county, Shimane pref.; Yairoishi - Takami - Mount Kanzan, 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.)
Hattori et al. (1983) Geology of the Sambesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 168p. (in Japanese with English abstract 7p.)