Hosei Member

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Hosei Member Tanaka and Hirabayashi, 1964

Type locality: Hosei, Ikeda city, Kitaazumi county, Nagano prefecture
Coherent formation
middle Miocene

Lithofacies: Interbedded sandstone and sandy mudstone, Sandy mudstone
Lithofacies (Minor): Sandstone, Conglomerate

Thickness: 300 m
Upper limit: Conformity (Nodaira Member)
Lower limit: Conformity (Sodeyama 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: Hosei - Ueno - Sakamori - Furusaka, Ikeda city, Kitaazumi county, Nagano pref.
Fossils (Shellfishes): Acila sp., Anadara cf. daitokudoensis, Anadara ninohensis, Angulus (Peronidia) venulosa, Calyptoraea tokunagai, Clementia (Compsomyax) iizukai, Clinocardium shiobarense, Dosinia japonica, Dosinia (Kaneharaia) kaneharai, Dosinia nagaii, Katerisia sp., Laevicardium angustum, Lucinoma acutilineata, Macoma incongrua, Macoma tokyoensis, Mercenaria y-iizukai, Nassarius (Hinia) japonica, Nassarius nakamurai, Ostrea sp., Pitar sp., Polinces didyma, Soletellina minoensis, Tectonatica severa, Tellina sp., Venericardia sp.

Kato and Sato (1983) Geology of the Shinano-Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 7p.)