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Sawane Formation
Synonym: Kaidate Formation, Shichiba Formation
- Type locality: Sawane village, Sado city, Niigata prefecture
- Coherent formation
- Middle Pleistocene
- Upper: Middle Pleistocene (0.79 - 0.51 Ma, Calcareous nannofossils, Paleomagnetic)
- Sedimentary facies: Marine
- Depth of water: 150 - 200 m (Shallow - Upper bathypelagic)
- Lithofacies: Sand, Gravel, Sandy silt, Interbedded sand and mud
- Upper limit: Unconformity (Terrace deposit)
- Lower limit: Unconformity (Kawachi Formation)
- Sawane Formation (by Endo, 1986)
- [ Upper ]
- ~~~~~~~~~~~~~~
- Sawane Formation, Main member
- '''''''/,,,,,,
- Kaidate Sandstone Member
- ~~~~~~~~~~~~~~
- [ Lower ]
- Sawane Formation (by Niigata foraminiferal research group, 1967)
- [ Upper ]
- ~~~~~~~~~~~~~~
- Shichiba Formation
- --------------
- Kaidate Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sawada - Shichiba, Sawane village, Sado city, Niigata pref.
- Fossils (Ostracods): 53 genus, 170 species; Schizocythere kishinouyei, Cythere sp., Xestoleberis sp., Finmarchinella hanaii, Loxoconcha kamiyai, Hemicythere emarginata, Hemicythere gurjanovae, Krithe sawanensis, Acanthocythereis dunelmensis, Robertsonites hanaii
- Ishida et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.8, pp.476-492 DOI