Nakatsugawa Group

[ Top ] [ Japanese ]

Nakatsugawa Group (Fujimoto et al., 1950) Hara et al., 2010

Accretionary complex
Accretion: Jurassic
Correlation: Hamadaira Group

Sedimentary facies: Marine
Lithofacies:

Upper limit: Unconformity (Shirasu Formation), Abut unconformity (Okaburi Formation)
Lower limit: Hakutai Thrust Fault (Urayama Group)

Nakatsugawa Group
[ Upper ]
/--/--/--/--/-
Ryokamiyama Chert Unit
/--/--/--/--/-
Nogurizawa Unit
/--/--/--/--/-
Ryokami Unit = Ohirayama Unit
/--/--/--/--/-
Ogamata Unit = Ohirayama Unit
/--/--/--/--/-
[ Lower ]

Southern Chichibu Belt (Mitsumine, Saitama pref.)
[ Upper ]
/--/--/--/--/-
Nakatsugawa Group
/--/--/--/--/-
Urayama Group
/--/--/--/--/-
[ Lower ]

Chichibu Belt
[ Upper ]
/--/--/--/--/-
Kurosegawa Belt
/--/--/--/--/-
Northern Chichibu Belt
/--/--/--/--/-
Southern Chichibu Belt
/--/--/--/--/-
[ Lower ]

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

Distribution: Saitama pref.

Hara et al. (2010) Geology of the Mitsumine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)