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Datekawarasawa Sandstone Member (Kosaka et al., 2005) Mukai et al., 2009

Invalid synonym: Dachikawarasawa Conglomerate, Sandstone and Siltstone Formation, Tatekabesawa Formation

• Type locality: 1,700 above sea level of Datekawarasawa creek, Matsumoto city, Nagano prefecture
• Coherent formation
• Pleistocene

• Lithofacies (Upper): Sandstone, Mudstone
• Lithofacies (Lower): Tuffaceous sandstone, Mudstone
• Lithofacies (Minor): Conglomerate
• Sedimentary structures (Lower): Parallel foliation, Slump structures, Flame structure, Upward-fining

• Upper limit: Unconformity (Lower Ogahana Lava)
• Lower limit: Unconformity (Hirokoba Lava)

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

• Distribution: 1,700 - 1,750 m above sea level of Datekawarasawa creek, Matsumoto city, Nagano pref.; 1,700 m above sea level of Daimon creek, Matsumoto city, Nagano pref.
• Fossils: Freshwater diatoms

• Mukai et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.400-422 DOI