Akaiwa Formation

Volcanic rocks
Miocene (10 - 9 Ma)

Lithofacies: altered Dacite, Silicified rocks

Otaru, Hokkaido
[ Upper ]
?--?--?--?--?-
Terrestrial andesite lava, 5 - 4 Ma
?--?--?--?--?-
Shioya Formation
?--?--?--?--?-
Oshoro Formation
?--?--?--?--?-
Takashima Formation / Hariusu Formation
?--?--?--?--?-
Kayashiba Formation
?--?--?--?--?-
Akaiwa Formation
?--?--?--?--?-
Otarunaigawa Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Otaru city, Hokkaido

Nishina et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.5, pp.387-402 DOI