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Nishihiro Formation
- Coherent formation
- Yuasa - Aridagawa basin
- Early Cretaceous, Aptian
- Sedimentary facies: Marine, Brackish, Fluvial
- Sedimentary facies (Main): Braided river
- Sedimentary facies (Minor): Estuary, Seashore
- Depth of water: Shallow marine
- Lithofacies (Main): Sandstone
- Lithofacies (Minor): Mudstone, Conglomerate, Coal
- Sedimentary structures: Trough cross-stratification, Planar cross-stratification, Parallel foliation, Ripple foliation
- Paleocurrent: North to South
- Thickness (Overall): 400 - 500 m
- Thickness (Upper mudstone): ca. 20 m
- Thickness (Upper sandstone): ca. 150 m
- Thickness (Lower mudstone): 100 - 150 m
- Thickness (Lower sandstone): 100 - 150 m
- Thickness (Basal conglomerate): ca. 30 m
- Lower limit: Unconformity (Kurosegawa Belt, Northern Chichibu Belt)
- Yuasa, Wakayama pref.
- [ Upper ]
- ?--?--?--?--?-
- Nishihiro Formation
- ~~~~~~~~~~~~~~
- Arida Formation
- --------------
- Yuasa Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
- Nishihiro, Wakayama pref.
- [ Upper ]
- ?--?--?--?--?-
- Nishihiro Formation
- ~~~~~~~~~~~~~~
- Ikenoue Formation
- ~~~~~~~~~~~~~~
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Cape Babe, Nishihiro, Hirogawa city, Arida county, Wakayama pref.; Shiraki - Oura seashore, Yamamoto, Hirogawa city, Arida county, Wakayama pref.
- Yao (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.90-106 DOI
- Kase and Maejima (2010) Jour. Geol. Soc. Japan, vol.116, no.5, pp.287-290 DOI