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Ikenoue Formation
- Coherent formation
- Late Jurassic, Oxfordian - Early Cretaceous, Barremian (Radiolarians)
- Upper: Early Cretaceous (Radiolarians)
- Middle: Late Jurassic, Tithonian - Early Cretaceous, Barremian (Radiolarians)
- Lower: Late Jurassic, Oxfordian - Kimmeridgian (Radiolarians)
- Correlation (Limestone): Torinosu Group
- Sedimentary facies: Marine
- Lithofacies (Top): Conglomerate
- Lithofacies (Upper): Mudstone, Interbedded sandstone and mudstone
- Lithofacies (Middle, Main): Interbedded sandstone and mudstone
- Lithofacies (Middle, Minor): Limestone
- Lithofacies (Lower): Conglomerate, Sandstone, Mudstone
- Thickness (Overall): ca. 570 m
- Thickness (Upper): ca. 400 m
- Thickness (Middle): ca. 130 m
- Thickness (Lower): ca. 40 m
- Upper limit: Unconformity
- Lower limit: Unconformity (Kurosegawa Belt)
- Middle
- [ Upper ]
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- Torinosu Group
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- [ Lower ]
- Ikenoue Formation
- [ Upper ]
- ~~~~~~~~~~~~~~
- Top
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- Upper
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- Middle
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- Lower
- ~~~~~~~~~~~~~~
- [ Lower ]
- Nishihiro, Wakayama pref.
- [ Upper ]
- ?--?--?--?--?-
- Nishihiro Formation
- ~~~~~~~~~~~~~~
- Ikenoue Formation
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Cape Nabae - Cape Babe, Nishihiro, Hirogawa city, Arida county, Wakayama pref.
- Fossils (Limestone, Hexacorallia): Aplosmilia? sp., Dimorpharaea tosaensis, Heliocoenia costulato, Isastraea sp., Pseudocoenia slovenia, Stylina higoensis, Stylina sugiyamai, Thamnasteria abukumaensis, Thamnasteria huzimotoi, Thecosmilia spp.
- Fossils (Limestone): Hydrozoans (Spongiomorpha asiatica), Sponges (Chaetetopsis crinita), Stromatoporoids (Parastromatopora japonica)
- Yao (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.90-106 DOI