Hiramatsu Formation

This formation had been considered as a member of Tsubuta Group which became a synonym of Mine Group.

Coherent formation
Late Triassic

Sedimentary facies: Marine, Terrestrial

Mine Group (Omine, Yamaguchi pref.)
[ Upper ]
?--?--?--?--?-
Asou Formation
--------------
Momonoki Formation
~~~~~~~~~~~~~~
Hirabara Formation
~~~~~~~~~~~~~~
[ Lower ]

Mine Group (Asa, Yamaguchi pref.)
[ Upper ]
?--?--?--?--?-
Kamoshiro Formation
--------------
Yamanoi Formation
--------------
Nakatsuka Formation
--------------
Idekami Formation
--------------
Hiramatsu Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Mine city, Yamaguchi pref.

Maeda and Oyama (2019) Jour. Geol. Soc. Japan, vol.125, no.8, pp.585-594 DOI