Hiratokosawa Member

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Hiratokosawa Member Shibata et al., 1976

Type locality: Hakuba city, Kitaazumi county, Nagano prefecture
Coherent formation
Pliocene

Sedimentary facies: Shallow marine
Lithofacies: Sandy mudstone
Lithofacies (Minor): Interbedded sandstone, Conglomerate, Sandstone, Acidic tuff

Thickness: ca. 350 m
Upper limit: Conformity (Idoirisawa Member)
Lower limit: Conformity (Yanagisawa Formation)

(Invalid name) Shigarami Formation (Togakushi, Nagano pref.)
[ Upper ]
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Ogikubo Sandy Mudstone Member
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Arakurayama Pyroclastic Member
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Takafu Mudstone Member
'''''''/,,,,,,
Gonda Sandstone Conglomerate Member
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[ Lower ]

(Invalid name) Shigarami Formation (Nagano, Nagano pref.)
[ Upper ]
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Ogikubo Sandy Mudstone Member
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Arakurayama Pyroclastic Member / Hirose Mudstone Member / Joshita Sandstone and Conglomerate Member
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Okubo Mudstone and Sandstone Member
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[ Lower ]

(Invalid name) Shigarami Formation (Komiji, Nagano pref.)
[ Upper ]
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Joshita Sandstone and Conglomerate Member
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Nagaiwa Member
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[ Lower ]

(Invalid name) Shigarami Formation (Hikage, Nagano pref.)
[ Upper ]
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Tanogashira Member
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Idoirisawa Member
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Hiratokosawa 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: Hakuba city, Kitaazumi county, Nagano pref.

Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)