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Arida Formation
- Coherent formation
- Yuasa - Aridagawa basin
- Early Cretaceous, Barremian (Bivalves)
- Sedimentary facies (Upper): ?
- Sedimentary facies (Middle): Marine
- Sedimentary facies (Lower): Terrestrial
- Sedimentary facies (Middle): Fan delta slople
- Sedimentary facies (Lower): Alluvial fan
- Depth of water: Shoreface - Inner shelf
- Lithofacies (Upper): Mudstone
- Lithofacies (Middle): Sandstone
- Lithofacies (Lower): Conglomerate
- Paleocurrent: North to South
- Thickness (North): ca. 150 m
- Thickness (South): ca. 300 m
- Thickness (Upper): 100 - 200 m
- Thickness (Middle): ca. 20 m
- Thickness (Lower): 30 - 100 m
- Upper limit: Disconformity
- Lower limit: Conformity, Unconformity (Kurosegawa Belt, Northern Chichibu Belt)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Takda, Arida city, Wakayama pref.; Yuasa city - Nishihiro, Hirogawa city, Arida county, Wakayama pref.
- Fossils (Bivalves): Crioceratites (Paracrioceras) asiaticum, Pseudohaploceras japonicum, Silesites sp.
- Fossils (Ammonoids): Crioceratites (Paracrioceras) asiaticumAPseudohaploceras japonicum, Silesites sp.
- 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
- Terabe and Matsuoka (2009) Jour. Geol. Soc. Japan, vol.115, no.3, pp.130-140 DOI