Ishifutagarisawa Mudstone Member

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Ishifutagarisawa Mudstone Member (Taguchi, 1962) Nakano and Tsuchiya, 1992

Invalid synonym: Ishifutagarisawa Formation

This member had been redefined from Kusanagi Formation to Okawa Formation by Nakano and Tsuchiya (1992).

Coherent formation
middle Miocene
Intruded by: Pyroxene andesite

Sedimentary facies: Marine
Lithofacies: Mudstone, Siltstone
Lithofacies: Acidic tuff

Thickness: 250 m
Upper limit: Transitional (Kusanagi Formation)

Okawa Formation
[ Upper ]
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Ishifutagarisawa Mudstone Member
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Main part
?--?--?--?--?-
[ Lower ]

Fukura, Yamagata pref.
[ Upper ]
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Kusanagi Formation
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Okawa Formation
?--?--?--?--?-
[ Lower ]

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

Distribution: Ishifutagari creek - Oguro? creek - Komata river, Mamurogawa city, Mogami city, Yamagata pref.

Nakano and Tsuchiya (1992) Geology of the Chokaisan and Fukura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 138p. (in Japanese with English abstract 7p.)
Tsuchiya (1989) Geology of the Osawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 6p.)