Shimonagasaki Conglomerate and Shale Member

[ Top ] [ Japanese ]

Shimonagasaki Conglomerate and Shale Member Yanagisawa et al., 1985

Coherent formation
Basal conglomerate
Miocene
Intruded by: Dolerite

Lithofacies: Unsorted breccia
Lithofacies (Basal): Interbedded arkose sandstone and conglomerate
Lithofacies (Minor): Sandstone, Siltstone, Shale, Conglomerate

Thickness: ca. 120 m
Lower limit: Unconformity (Ultramafic rocks, Cretaceous granites)

Okura Formation
[ Upper ]
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Ozuki Tuff and Shale Member
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Okura Andesite Member
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Shimonagasaki Conglomerate and Shale Member
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[ Lower ]

Jonai Group
[ Upper ]
~~~~~~~~~~~~~~
Hakkaisan Formation
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Okura Formation
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[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Noborikawa river, Shimonagasaki - Ikazawa river, Minamiuonuma city, Niigata pref.
Fossils (Daijima-type flora): Fagus antipofi, Parrotia sp.

Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)
Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)