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Sasayama Group (Onoyama, 1931) Hayashi et al., 2017
- Type locality: Sasayama city, Hyogo prefecture
- Coherent formation
- Intermountain basin
- Early Cretaceous, Albian - Late Cretaceous, Cenomanian (105.6 - 96.0 Ma, FT, Ostracods)
- Correlation: Kanmon Group
- Intruded by: Porphyrite dykes, Sills
- Sedimentary facies: Fluvial
- Sedimentary facies (Lower): Channel-fill deposit
- Climate: Sub-humid - Semi-arid
- Lithofacies (Upper): Hornblende andesite Lapilli tuff, Tuff breccia, Tuff, Tuffaceous sandstone, Conglomerate, Mudstone, Sandstone
- Lithofacies (Lower): Sandstone, Mudstone
- Lithofacies (Lower, Minor): Shale, Rhyolite tuff
- Lithofacies (Bottom): Conglomerate
- Sedimentary structures (Lower): Cross stratification, Trace fossils, Slump structure, Convolute lamination
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hatamiya - Ogami - Seri, Tambasasayama city, Hyogo pref.; Kamitaki - Shimotaki, Tanba city, Hyogo pref.
- Fossils: Sauropods, Mammals, Amphibians, Charophyceae green algae, Chalophyta sp.
- Fossils (Upper, Shellfishes): Nakamuranaia? cf. chingshanensis, Viviparus onogoensis
- Fossils (Upper, Plants): Adiantites sp., Bennettitales? sp., Brachyphyllum japonicum, Cladophlebis sp., Cupressionoxylon sp., Elatocladus sp., Equisetites sp., Frenelopsis sp., Ginkgoites digitata, Otozamites cf. beani, Podozamites cf. lanceolatus
- Fossils (Upper, Estherids): Estherites cf. kyöngsangensis, Estherites cf. kyöngsangensis var. medialis, Estherites cf. nactongensis
- Fossils (Upper, Ostracods): Yanjiestheria sp., Nemestheria aidensis
- Fossils (Lower, Shellfishes): Viviparus cf. keishoensis, Sphaerium coreanicum
- Fossils (Lower, Ostracods): Mongolocypris sp., Eucypris sp.
- Tephra: SSY-2 Tuff
- Hayashi et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.9, pp.747-764 DOI
- Hayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.5, pp.283-286 DOI
- Kurimoto et al. (1993) Geology of the Sasayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
- Imoto et al. (1991) Geology of the Sonobe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 4p.)