[ Top ] [ Japanese ]

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

• Sedimentary facies: Fluvial
• Climate: Sub-humid - Semi-arid
• Lithofacies: Conglomerate, Sandstone, Mudstone
• Lithofacies (Minor): Tuff, Andesitic volcanic breccia

• Thickness: 1,500 m
• Upper limit: Unconformity (Arima Group)
• Lower limit: Unconformity (Ajima Formation, Kashiwabara Formation, Kamitaki Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Sasayama basin, Sasayama city, Hyogo pref.; Kamitaki - Shimotaki, Tanba city, Hyogo pref.
• Fossils: Sauropods, Mammals, Amphibians, Molluscs, Estherids, Ostracods, Charophyceae green algae, Plants
• Fossils (Upper, Ostracods): Yanjiestheria sp., Nemestheria aidensis
• 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