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Kitayama Mudstone and Sandstone Member Tanaka and Seki, 1966
- Type locality: Kitayama, Azumino city, Nagano prefecture
- Coherent formation
- middle Miocene
- Lithofacies: Gravel-bearing sandy mudstone, Conglomerate
- Sedimentary structures: Slump structures, Clastic dikes
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kitayama - Takamatsuzawa creek - Yazawa - Aso - Nenokami - Gojo, Azumino city, Nagano pref.
- Fossils: Sea lion (Allodesmus kernensis)
- Fossils (Shellfishes): Acila divaricata, Acila submirabilis, Anadara amicula tazawensis, Anadara kurodai, Anadara makiyamai, Anadara watanabei, Callista sp., Coptothyris grayi, Dentalium fisidentalium yokoyamai, Dosinia chikuzenensis, Dosinia (Kaneharaia) sp., Felaniella usta, Fusinus sp., Fusitriton sp., Glycymeris k-suzukii, Lucinoma acutilineata, Mercenaria y-iizukai, Nassarius nakamurai, Neverita didyma, Neverita fissuratus, Ostrea sp., Panope japonica, Patinopecten sp., Saccella confuse kongiensis, Saccella omori, Siphonaria sp., Tectonatica janthostomoides, Tectura cf. asmiiformis, Trachycardium shiobarense
- Harayama et al. (2009) Geology of the Matsumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 3p.)