Tsunagi Formation

Coherent formation
Miocene

Lithofacies (Top): Isbt
Lithofacies: Diatomaceous mudstone

Lower limit: Transitional (Nishimyo Formation)

Sumon, Niigata pref.
[ Upper ]
?--?--?--?--?-
Tsunagi Formation
--------------
Nishimyo Formation
--------------
Anazawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Sumon, Suhara, Uonuma city, Niigata pref.
Tephra: Isbt

Hiranaka et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.4, pp.177-186 DOI
Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)