Obayashi Formation

[ Top ] [ Japanese ]

Obayashi Formation

Type locality: Obayashi, Oishida city, Kitamurayama county, Yamagata prefecture
Coherent formation
Pliocene

Lithofacies: Interbedded sandstone and shale
Lithofacies (Upper, Minor): Coal

Thickness: ca. 400 m
Upper limit: Transitional (Waraguchi Formation)

Shinjo Group
[ Upper ]
~~~~~~~~~~~~~~
Oriwatari Formation
--------------
Waraguchi Formation
--------------
Obayashi Formation
--------------
[ Lower ]

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

Distribution: Obayashi, Oishida city, Kitamurayama county, Yamagata pref.
Fossils (Shellfishes): Macoma anser

Tokunaga (1958) Obanazawa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 6p.)