Shige Member

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Shige Member Kobayashi and Isomi, 1950

Type locality: Hanagawara pass, Shiga, Matsumoto city - Chikuhoku city, Higashichikuma county, Nagano prefecture
Coherent formation
Miocene
Intruded by: Porphyrite sills, Andesite sills

Lithofacies: Sandstone, Gravelly sandstone, Conglomerate
Lithofacies (Minor): Sandy mudstone, Interbedded sandstone and sandy mudstone, Coal, Tuff
Sedimentary structures: Ripple marks, Cross stratification

Thickness: ca. 70 - 300 m
Upper limit: Conformity (Susobana Formation, Komiji Member)
Lower limit: Conformity (Sashikiri Member)

Shige Member
[ Upper ]
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Bodaira Tuff
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[ Lower ]

(Invalid name) Ogawa Formation (Nagano, Nagano pref.)
[ Upper ]
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Ronji Mudstone Member
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Susobana Tuff Member
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Koso Tuff
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Shige Member
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Sashikiri Member
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[ Lower ]

(Invalid name) Ogawa Formation (Komiji, Nagano pref.)
[ Upper ]
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Komiji Member
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Shige Member
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Sashikiri 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: Hanagawara pass - Midarebashi - Mount Azumaya - Mount Osawa - Sashikiri - Shige, Chikuhoku city, Higashichikuma county, Nagano pref.; Machida - Wadaira, Ooka, Nagano city, Nagano pref.
Fossils (Omi flora):
Fossils (Lower, Yamazaki subflora): Acer sp., Betula sp.

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.)
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.)
Kato (1980) Geology of the Sakaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)