Uridani Formation

Accretionary complex
Paleocene (Radiolarians)

Sedimentary facies: Marine
Lithofacies: Mudstone
Lithofacies (Minor): Siliceous mudstone, Green rocks

Thickness: 30 - 3000 m or thicker
Upper limit: Bottom of the horizon of interbedded sandstone and mudstone
Upper limit: Conformity (Haroku Formation)
Lower limit: Chikatsuyu Thrust fault

Otonashigawa Group
[ Upper ]
/--/--/--/--/-
Fudono Formation
--------------
Haroku Formation
--------------
Uridani Formation
/--/--/--/--/-
[ Lower ]

Shimanto Belt (Wakayama pref.)
[ Upper ]
/--/--/--/--/-
Koyasan Group = North Shimanto
/--/--/--/--/-
Hidakagawa Group = North Shimanto
/--/--/--/--/-
Nyunokawa Formation
/--/--/--/--/-
Otonashigawa Group
/--/--/--/--/-
Muro Group
/--/--/--/--/-
[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Tondagawa river - Hikigawa river - Otonashigawa river - Mikoshigawa river - Kamoredani valley - Hosshinmon - Michinokawa - Chikatsuyu - Fukusada - Kaoredani valley - Iwasaki - Minanokawa, Tanabe city, Wakayama pref.
Fossils (Radiolarians): Bathysiphon sp., Cyclogyra? sp., Dentalina sp., Globigerina? sp., Haplophragmoides? sp., Lagena? sp.

Tokiwa et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.12, pp.625-635, DOI
Bessho and Nakaya (2011) Jour. Geol. Soc. Japan, vol.117, no.8, pp.423-438 DOI
Tokuoka et al (1981) Geology of the Ryujin District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 6p.)
Suzuki et al (1979) Geology of the Kurisugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 5p.)