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Katsuura Mudstone Member (Nakano, 1953) Noda et al., 2021
Invalid synonym: Katsuura Shale, Katsuura Formation
- Type locality: Mount Hachiminezan, Manno city, Nakatado county, Kagawa prefecture
- Coherent formation
- Izumi sedimentary basin
- Forearc basin associated with strike-slip fault related to Median Tectonic Line
- Late Cretaceous, middle Campanian (79.3 Ma, U-Pb)
- Sedimentary facies: Lower submarine fan, Sedimentary basin floor
- Sedimentary facies: Low-density turbidity current sheet flow
- Lithofacies (Upper): Interbedded sandstone and mudstone
- Lithofacies (Middle): Mudstone, Mudstone-dominant interbedded sandstone and mudstone
- Lithofacies (Middle, Minoe): Felsic tuff, Sandstone, Tuffaceous sandstone, Sandstone-dominant interbedded sandstone and mudstone
- Lithofacies (Lower): Mudstone, Mudstone-dominant interbedded sandstone and mudstone
- Sedimentary structures: Graded bedding
- Thickness: 1,300 m or thicker
- Lower limit: Bottom of mudstone-dominant interbedded sandstone and mudstone
- Lower limit: Transitional (Nagoro Mudstone Member)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Hachiminezan - Masuzu - Haze, Manno city, Nakatado county, Kagawa pref.; Takinooku - Shibau - Kochidanigawa river, Miyoshi city, Tokushima pref.
- Fossils: Ammonoids (Baculites sp.)
- Fossils (Radiolarians): Amphipyndax pseudoconulus, Amphipyndax tylotus, Archaeodictyomitra lamellicostata, Dictyomitra densicostata, Dictyomitra koslovae, Dictyomitra multicostata
- Noda et al. (2021) Geology of the Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 150p. (in Japanese with English abstract 5p.)