Shiroi Formation

Coherent formation
Hauterivian, Late Cretaceous

Upper limit: Lithofacies boundary
Lower limit: Lithofacies boundary

(Invalid name) Sancyu Graben
[ Upper ]
?--?--?--?--?-
Sanyama Formation
~~~~~~~~~~~~~~
Sebayashi Formation
--------------
Ishido Formation
--------------
Shiroi Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Gunma pref. - Saitama pref.

Matsui et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.6, pp.261-266, DOI