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Hamamashino Formation

• Coherent formation
• Miocene

• Sedimentary facies: Marine
• Lithofacies: Mudstone-dominant interbedded sandstone and mudstone, Interbedded sandstone and mudstone, Sandstone-dominant sandstone and mudstone
• Sedimentary structures (Sandstone): Parallel stratification, Hummocky cross-stratification, Current ripples, Wave-formed ripples
• Sedimentary structures (Interbeds): Planar cross-stratification, Trough cross-stratification, Herringbone cross-stratification

• Upper limit: Conformity
• Lower limit: Conformity

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

• Distribution: Tsumajiro - Tatsukushi, Tosashimizu city, Kochi pref.

• Nara et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.7, pp.471-489 DOI