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Omma Formation, Onma Formation
Invalid synonym: Omma Sandstone Formation, Onma Sandstone Formation
- Sedimentary facies: Marine
- Climate: Cold
- Depth of water (Upper): Upper sublittoral zone (20 -100m, Nannofossils)
- Depth of water (Lower): Lower sublittoral zone (35 -100m, Nannofossils)
- Lithofacies (Upper, Main): Fine - coarse sandstone
- Lithofacies (Upper, Minor): Siltstone, Conglomerate
- Lithofacies (Lower, Main): Fine sandstone, Siltstone
- Omma Formation
- [ Upper ]
- ~~~~~~~~~~~~~~
- Upper
- --------------
- Lower
- ?--?--?--?--?-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Southern Kanazawa city, Ishikawa pref.; Tagawa - Hachibuse, Oyabe city, Toyama pref.
- Fossils: Omma-Manganji fauna
- Fossils: Calcareous nannofossils, Bivalves, Gastropods, Echinarachnius sp. (Upper)
- Tephra: Tagawa tuffaceous tuff (21 m thick), O2 tuff
- Kaneko et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.5, pp.193-206, DOI
- Tamura et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.1-20 DOI