Yanahara Group

[ Top ] [ Japanese ]

Yanahara Group

Coherent formation
Permian

Sedimentary facies: Marine
Lithofacies: Hornfels
Lithofacies: Shale
Lithofacies (Minor): Trachyandesite tuff, Rhyolite lava, Rhyolite tuff, Crystalline tuff, Sandstone

Thickness: ca. 1,100 m
Distribution (East - West): ca. 7 km
Distribution (South - North): ca. 10 km

Maizuru Group (Akaiwa, Okayama pref.)
[ Upper ]
/--/--/--/--/-
Dodo Group
/--/--/--/--/-
Kose Group
/--/--/--/--/-
Yanahara Group
/--/--/--/--/-
[ Lower ]

Central zone (Okayama pref.)
[ Upper ]
/--/--/--/--/-
Nakaiso Conglomerate Bed
?--?--?--?--?-
Yanagi Formation
?--?--?--?--?-
Fukumoto Group
~~~~~~~~~~~~~~
Maizuru Group
/--/--/--/--/-
[ Lower ]

Maizuru Belt
[ North ]
/--/--/--/--/-
North zone
/--/--/--/--/-
Central zone
/--/--/--/--/-
South zone
/--/--/--/--/-
[ South ]

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

Distribution: Yanahara mine - Soda - Kichigahara - Fujita, Misaki city, Kume county, Okayama pref.; Totsuno - Kawaraya - Kuso, Akaiwa city, Okayama pref.; Tsuetani, Wake city, Wake county, Okayama pref.

Mitsuno and Omori (1965) Susai, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 59p. (in Japanese with English abstract 17p.)