Sori Member

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Sori Member

Formerly included in Uonuma Group.

Type locality: Sori, Tsunan city, Nakauonuma county, Niigata prefecture
Volcanic rocks
Pleistocene
Correlation: middle Uonuma Group

Lithofacies: Andesite tuff breccia, Lapilli, Gravels, Interbedded sands and silt

Thickness: 130 - 180 m
Upper limit: Top of SK030
Upper limit: Conformity
Lower limit: Bottom of Tt-TB
Lower limit: Conformity (Koikegawa Member)

Kamigo Formation
[ Upper ]
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Sori Member
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Koikegawa Member
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[ Lower ]

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

Distribution: Sori - Shinano river, Tsunan city, Nakauonuma county, Niigata pref.
Tephra: Tt-TB, SK030

Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)