Kitayama Mudstone and Sandstone Member

[ Top ] [ Japanese ]

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

Thickness: 550 m
Lower limit: Conformity (Hakumaki Sandstone and Conglomerate Member)

Aoki Formation (Nagano, Nagano pref.)
[ Upper ]
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Asakawa Member
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Hitoeyama Member
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[ Lower ]

Aoki Formation (Matsumoto, Nagano pref.)
[ Upper ]
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Kitayama Mudstone and Sandstone Member
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Hakumaki Sandstone and Conglomerate Member
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[ Lower ]

(Invalid) Aoki Formation (Togakushi, Nagano pref.)
[ Upper ]
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Asakawa Mudstone Member
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Senmi Sandstone Mudstone Member => Ronji Formation
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Nishikyo Mudstone Member
?--?--?--?--?-
[ Lower ]

(Invalid) Aoki Formation (Omachi, Nagano pref.)
[ Upper ]
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Agero Member
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Nodaira Member
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Hosei Member
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Sodeyama Member
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[ Lower ]

Hokushin Group
[ Upper ]
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Shigarami Formation
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Ogawa Formation
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Aoki Formation
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[ Lower ]

northern Nagano pref.
[ Upper ]
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Hokushin Group
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Chushin Group
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[ Lower ]

------ 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.)