Sakadoyama Sandstone and Shale Member

[ Top ] [ Japanese ]

Sakadoyama Sandstone and Shale Member Yanagisawa et al., 1985

Coherent formation
Miocene
Intruded by: Porphyrite, Andesite
Intruded by (Lower): Quartz porphyry

Lithofacies: Conglomerate, Sandstone, Siltstone, Mudstone, Tuff breccia

Thickness (Upper): 200 m or thicker
Thickness (Lower): 150 m or thicker
Upper limit: Unconformity (Hakkaisan Conglomerate Member)
Lower limit: Unconformity (Mizunashigawa Metamorphic Rocks, Nakanotake Metagabbros, Okura Andesite Member, Granite)

Hakkaisan Formation
[ Upper ]
~~~~~~~~~~~~~~
Kinjosan Volcanic Conglomerate Member
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Sakadoyama Sandstone and Shale Member
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Hakkaisan Conglomerate Member
~~~~~~~~~~~~~~
[ Lower ]

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

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

Distribution: Mount Sakadoyama - Mount Katsurayama, Minamiuonuma city, Niigata pref.

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.)