Onogawa Hard Shale Member

Coherent formation
Miocene
Correlation: Teradomari Formation

Lithofacies: Shale
Lithofacies (Minor): Sandy tuff

Uwano Formation
[ Upper ]
--------------
Jyunitoge Green Tuff Member
--------------
Onogawa Hard Shale Member
--------------
[ Lower ]

Uonuma hills
[ Upper ]
--------------
Mugurazawa Formation
--------------
Osawa Formation
--------------
Uwano Formation
--------------
[ Lower ]

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

Distribution: Niigata pref.

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.)