Niteno Member

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Niteno Member

Formerly included in Uonuma Group.

Type locality: Usumaru creek, Kitano river, Sakae city, Shimominochi county, Nagano prefecture
Volcanic rocks
Pleistocene

Lithofacies: Lapilli tuff
Lithofacies (Minor): Pyroxene andesite lava, Tuff breccia, Volcanic ash

Thickness: ca. 125 m
Upper limit: Top of the andesite-dominant tuff breccia bed
Upper limit: Conformity (Maeko Member)
Lower limit: Bottom of Nis or Andesite-dominant mudflow deposit
Lower limit: Conformity

Shikumigawa Formation
[ Upper ]
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Maeko Member
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Niteno Member
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[ Lower ]

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

Distribution: Kitano river - Shikumi river - right bank of Shinano river, Sakae city, Shimominochi county, Nagano pref.
Tephra: Nis

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.)