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S4 Member
- Type locality: Wakayama prefecture
- Coherent formation
- Miocene
- Sedimentary facies: Marine
- Sedimentary facies: Sediments in the regression stage
- Lithofacies (Upper): Mudstone-dominant interbedded sandstone and mudstone, Siltstone
- Lithofacies (Lower): Sandstone, Sandstone-dominant interbedded sandstone and mudstone
- Sedimentary structures: Planar cross-stratification, Herringbone cross-stratification, Mud drapes
- Upper limit: Conformity
- Lower limit: Conformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Wakayama pref.
- Miyata et al., (2009) Jour. Geol. Soc. Japan, vol.115, no.9, pp.470-482 DOI