U-I

Coherent formation
Late Cretaceous

Sedimentary facies: Marine
Lithofacies: Mudstone

Upper limit: Conformity

Himenoura Group (Koshikijima islands)
[ Upper ]
~~~~~~~~~~~~~~
U-IV Formation
--------------
U-III Formation
--------------
U-II Formation
--------------
U-I Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Koshikijima islands, Kagoshima pref.

Komatsu et al. (2014) Jour. Geol. Soc. Japan, vol.120, Supplement, pp.19-39 DOI
Tonai et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.11, pp.547-559 DOI