Yagisawa Tuff Member

[ Top ] [ Japanese ]

Yagisawa Tuff Member

Volcanic rocks
Miocene
Intruded by: Quartz porphyry
Correlation: Sennokura Pyroclastic Rock Formation

Lithofacies (Upper): Dacite lapilli tuff
Lithofacies (Upper, Minor): Tuff breccia, Shale, Volcanic sandstone
Lithofacies (Lower): Rhyolite tuff
Lithofacies (Lower, Minor): Tuff breccia, Shale

Kiyotsu Formation
[ Upper ]
--------------
Omine Sandstone Shale Member
--------------
Yagisawa Tuff Member
--------------
Yuzawa Sandstone Conglomerate Member
--------------
Shibahara Tuff Member
--------------
[ Lower ]

Yuzawa, Niigata pref.
[ Upper ]
--------------
Kiyotsu Formation
?--?--?--?--?-
Shiraita Formation
--------------
Matsukawa Formation
--------------
[ Lower ]

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

Distribution: Niigata pref.
Fossils: Fish (Clupeidae gen. et sp. indet, Scorpaeniformes)

Chihara et al. (1981) Geology of the Echigo-Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 108p. (in Japanese with English abstract 8p.)