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Ashiro Mudstone Member
Invalid synonym: Ashiro Formation
- Type locality: Ashiro, Higashimiyoshi city, Miyoshi county, Tokushima prefecture
- Coherent formation
- Izumi sedimentary basin
- Forearc basin associated with strike-slip fault related to Median Tectonic Line
- Late Cretaceous, middle Campanian
- Interfingered: Hiketa Formation
- Sedimentary facies: Lower submarine fan, Sedimentary basin floor
- Sedimentary facies: Low-density turbidity current sheet flow
- Sedimentary facies: Turbidite
- Lithofacies: Mudstone
- Lithofacies (Minor): Sandstone, Felsic tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ashiro - Kuzukago - Uchino - Nakanomine - Dodoro - Sadayasu, Higashimiyoshi city, Miyoshi county, Tokushima pref.; Kunigino - Shioiri - Mount Daisenzan, Manno city, Nakatado county, Kagawa pref.
- Fossils: Ammonoids (Baculites sp.), Gastropods, Trace fossils (Archaeozoastera isp.)
- Fossils (Bivalves): Inoceramus balticus, Propeamussium sp.
- 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.)