Sakasegawa Formation

Coherent formation
middle Eocene

Sedimentary facies: Marine
Depth of water: Shallow

Upper limit: Conformity (Futae Formation)
Lower limit: Conformity (Itchoda Formation)

Sakasegawa Group
[ Upper ]
?--?--?--?--?-
Oniike Formation
--------------
Futae Formation
--------------
Sakasegawa Formation
--------------
Itchoda Formation
--------------
[ Lower ]

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

Distribution: Amakusa-Shimoshima island, Amakusa city, Kumamoto pref.; Gesu island, Ushibuka town, Amakusa city, Kumamoto pref.
Fossils: Foraminifera, Calcareous nannofossils, Shellfishes

Ando et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.4, pp.187-190 DOI