Takidani Member

Takidani Member (Kishida and Wadatsumi, 1967) Igi and Wadatsumi 1980

Invalid synonym: Gomyo Welded Tuff

Type locality: Takidani - Hatsutoji, Yoshinaga town, Bizen city, Okayama prefecture
Type locality: Higashigomyo, Aioi city, Hyogo prefecture
Volcanic rocks
Late Cretaceous

Lithofacies: Pyroclastic flow deposit
Lithofacies (Upper): Alkaline dacite welded crystalline tuff
Lithofacies (Middle): Rhyolite welded crystalline tuff
Lithofacies (Lower): Dacite welded crystalline tuff
Sedimentary structures: Platy joints, Columnar joint, Eutaxitic structures

Thickness: ca. 120 - 450 m
Distribution (Diameter): 100 km or more
Upper limit: Conformity (Hatsutoji Member)

Tsurukamejobu Formation
[ Upper ]
~~~~~~~~~~~~~~
Takidani Member
~~~~~~~~~~~~~~
Kagami Member
~~~~~~~~~~~~~~
[ Lower ]

Aioi Group (Hyogo pref. - Okayama pref.)
[ Upper ]
~~~~~~~~~~~~~~
Ako Formation
~~~~~~~~~~~~~~
Tsurukamejobu Formation
~~~~~~~~~~~~~~
Tsurukamekabu Formation
~~~~~~~~~~~~~~
Kamigorijobu Formation
~~~~~~~~~~~~~~
Kamigorikabu Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Takidani - Hatsutoji, Bizen city, Okayama pref.; Higashigomyo - Nishigomyo - Mount Komyosen - Wakasano, Aioi city, Hyogo pref.; Harima-Shizenkoen - Taisenji temple - Namazutoge pass - Mount Heitanyama, Kamigori city, Ako county, Hyogo pref.

Igi and Wadatsumi (1980) Geology of the Kamigori District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 4p.)