Nakao Tuff Member

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Nakao Tuff Member

Volcanic rocks
Late Cretaceous

Lithofacies: Rhyolitic dacite - Rhyolite non-welded/welded tuff (more than 3 flow units)
Lithofacies (Minor): Sandstone, Tuff, Tuffaceous sandstone, Mudstone, Accretionary lapilli tuff

Thickness (A unit): 100 - 300 m
Upper limit: Conformity (Yarimi Tuff Member)
Lower limit: Transitional (Sodegadani Conglomerate Member)

Nakao Formation
[ Upper ]
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Nakao Tuff Member
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Sodegadani Conglomerate Member
~~~~~~~~~~~~~~
[ Lower ]

Kasagatake Rhyolites
[ Upper ]
~~~~~~~~~~~~~~
Kasagatakesancho Welded Tuff
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Anagedani Formation
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Kasadani Formation
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Nakao Formation
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[ Lower ]

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

Distribution: Hanetani, Okuhidaonsengo, Takayama city, Gifu pref.

Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)