Myogazawa Formation

[ Top ] [ Japanese ]

Myogazawa Formation Yanagisawa et al., 1986

Type locality: Myogazawa, Minamiuonuma city, Niigata prefecture
Accretionary complex
Jurassic?

Sedimentary facies: Marine
Matrix: Interbedded shale and sandstone
Exotic blocks (Crusts): Sandstone, Chert, Greenstone

Thickness: 800 m or thicker
Upper limit: Unconformity (Okura Formation)
Lower limit: Conformity (Himizo Formation)

Kamigongendoyama Group
[ Upper ]
/--/--/--/--/-
Myogazawa Formation
--------------
Himizo Formation / Hanegawa Formation / Kenomatasawagawa Formation
--------------
Okuwabara Formation
/--/--/--/--/-
[ Lower ]

Ashio Belt (Echigo Mountains)
[ Upper ]
/--/--/--/--/-
Oshirakawa Complex
/--/--/--/--/-
Kuromatagawa Complex
/--/--/--/--/-
Kamigongendoyama Complex
/--/--/--/--/-
[ Lower ]

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

Distribution: Myogazawa, Minamiuonuma city, Niigata pref.

Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)
Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)