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Aya Formation (Shuto, 1952)
Invalid synonym: Aya Member of Higashimorogata Formation
- Boundary between Philippine sea plate and Eurasian plate
- Fore-arc basin sediments
- Coherent formation
- Sedimentary facies: Marine
- Sedimentary facies: Inner bay, Shallow marine
- Sedimentary facies: Low-density turbidity current, Slump
- Depth of water: Outer continental shelf, Upper continental slope
- Depth of water: 50 - 100 m (Fossils)
- Lithofacies: Mudstone, Mudstone-dominant interbedded sandstone and mudstone
- Lithofacies (Minor): Gravelly mudstone, Sandstone
- Sedimentary structures: Slump structures
- Thickness: 300 m or thinner
- Upper limit (North): Interfingered
- Upper limit (South): Conformity
- Lower limit: Conformity
- Miyazaki Facies
- [ Upper ]
- ~~~~~~~~~~~~~~
- Ikime Formation
- '''''''/,,,,,,
- Kamurano Formation
- '''''''/,,,,,,
- Aya Formation
- --------------
- Tano Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: central part of Nichinan seashore, Miyazaki pref.
- Fossils: Foraminifera, Shellfishes
- Ishihara et al. (2014) Jour. Geol. Soc. Japan, vol.120, Supplement, pp.41-62 DOI
- Takashimizu (2009) Jour. Geol. Soc. Japan, vol.115, no.11, pp.559-577 DOI