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Iwade Formation Tanaka, 1965
- Coherent formation
- Izumi sedimentary basin
- Forearc basin associated with strike-slip fault related to Median Tectonic Line
- Late Cretaceous, Maastrichtian (73.3 Ma, FT)
- Sedimentary facies: Main filling of the sedimentary basin
- Lithofacies: Turbidite
- Lithofacies: Sandstone-dominant interbedded sandstone and mudstone
- Sedimentary structures: Graded bedding, Flute marks, Groove marks
- Paleocurrent: from East-northeast to West-southwest
- Thickness: ca. 2,100 - 5,100 m
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Negoroji temple, Iwade city, Wakayama pref.; Shinotoge pass, Kinokawa city, Wakayama pref.; Futasegawa river - Inunaki, Izumisano city, Osaka pref.; Kogigawa river - Tsudagawa river, Kaizuka city, Osaka pref.; Kinyujigawa river, Shintachi, Sennan city, Osaka pref.
- Tephra: t15 (73.3 Ma, FT)
- Miyata et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.37-52 DOI
- Makimoto et al. (2004) Geology of the Kokawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 89p. (in Japanese with English abstract 4p.)
- Miyata et al. (1993) Geology of the Wakayama and Ozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 4p.)
- Itihara et al. (1986) Geology of the Kishiwada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)