Hachimandai Formation

Paleozoic volcanic island arc in the ocean (Yakuno paleo-island arc)
Coherent formation
Sedimentary rocks: middle- late Permian (Radiolarians)
Correlation: Maizuru Group

Sedimentary facies: Marine

Central zone (Hiroshima)
[ Upper ]
?--?--?--?--?-
Karita Formation
?--?--?--?--?-
Hachimandai Formation
?--?--?--?--?-
Yoshiwa Group
?--?--?--?--?-
[ Lower ]

Maizuru Belt
[ North ]
/--/--/--/--/-
North zone
/--/--/--/--/-
Central zone
/--/--/--/--/-
South zone
/--/--/--/--/-
[ South ]

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

Distribution: Mukaihara, Hiroshima city, Hiroshima pref.

Kimura et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.2, pp.153-165 DOI