Awashima Shale Member

Awashima Shale Member (Chihara and Nishida, 1972) Kato, 1981

Type locality: Tsuranobama seashore, Hatazaki, Awashimaura city, Iwafune county, Niigata prefecture
Coherent formation
Miocene
Correlation: Nanatani Formation

Lithofacies: Shale (partly glauconite-bearing)
Lithofacies (Minor): Sandstone, Tuffaceous mudstone, Gravelly sandstone, Siltstone

Thickness: 200 m or thicker
Lower limit: Conformity (Hagenohama Sandstone and Conglomerate Member)

Awashima Formation
[ Upper ]
?--?--?--?--?-
Awashima Shale Member
--------------
Hagenohama Sandstone and Conglomerate Member
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Tsuranobama seashore, Hatazaki, Awashimaura city, Iwafune county, Niigata pref.
Fossils: Pipe rocks
Fossils (Foraminifera): Ammodiscus incertus, Bulimina pupoides, Cyclammina sp., Ellipsonodosaria sp., Epistominella japonica, Frondicularia sp., Globigerina spp., Globorotalia fohsi, Haplophragmoides sp., Hopkinsina sp., Martinottiella bradiana, Martinottiella communis, Nonion pacificum, Nonion pompioides, Pullenia bulloides, Spirosigmoilinella compressa

Kato (1981) Geology of the Awashima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 3p.)