Nakajogawa Member

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Nakajogawa Member

Formerly included in Uonuma Group.

Type locality: Nakajo river, Tsunan city, Nakauonuma county, Niigata prefecture
Volcanic rocks
Pleistocene
Correlation: Naradate Formation, Nonomigawa Pyroclastic Rock Member

Lithofacies: Andesite tuff breccia
Lithofacies (Minor): Volcanic conglomerate, Andesite lava, Volcanic sands

Thickness: 250 m or thicker
Upper limit: Top of My-TB
Lower limit: Bottom of Ka-TB
Lower limit: Conformity (Tarudagawa Member)

Amamizuyama Formation
[ Upper ]
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Nakajogawa Member
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Tarudagawa Member
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Karigamine Member
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[ Lower ]

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

Distribution: Nakajo river, Tsunan city, Nakauonuma county, Niigata pref.; Yokokura creek - Yoei?, Uonuma city, Niigata pref.

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.)