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Udeyama Sandstone-dominated sandstone-mudstone Member

• Coherent formation
• Miocene

• Sedimentary facies: Brackish
• Sedimentary facies: Fan delta
• Sedimentary facies: Fan delta slope (outer shelf - inner shelf), Lower shoreface, Upper shoreface, Sand ridge, Sublacustrine channel-fill, Levee
• Lithofacies: Sandstone-dominant interbedded sandstone and mudstone

• Upper limit: Conformity (Josoji Formation)

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

• Distribution: Shimane peninsula, Shimane pref.
• Fossils: Ostrea sp., Corbicula sp.

• Sakai et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.4, pp.285-299 DOI