Karumai Formation

Coherent formation
Miocene

Sedimentary facies: Marine
Sedimentary facies: Fan delta
Lithofacies: Mudstone, Siltstone, Interbedded sandstone and mudstone

Thickness: 600 - 1,100 m
Thickness (Mudstone, Siltstone): ca. 1,000 m
Thickness (Interbedded sandstone and mudstone): ca. 100 m

Atsuma region
[ Upper ]
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Karumai Formation
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Kawabata Formation
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Takinoue Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Kamihoronai, Atsuma city, Yufutsu county, Hokkaido
Fossils: Shellfishes, Trace fossils

Takahashi et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.10, pp.565-578 DOI