Magidai Formation

[ Top ] [ Japanese ]

Magidai Formation

Type locality: Magidai, Yamagata town, Kuji city, Iwateprefecture
Accretionary complex
Deposition (Limestone): Triassic (Conodont)

Sedimentary facies: Marine
Lithofacies: Mélange facies
Lithofacies: Coherent facies (Chert-clastic sequence)
Lithofacies: Mudstone, Interbedded sandstone and mudstone, Sandstone, Chert
Lithofacies (Minor): Tuff, Limestone, Conglomerate
Sedimentary structures: Graded bedding

Thickness: 250 - 1,000 m

Akka - Tanohata Sub-belt (Rikuchu-Seki, Iwate pref.)
[ Upper ]
/--/--/--/--/-
Takayashiki Formation
/--/--/--/--/-
Akka Formation
/--/--/--/--/-
Sawayamagawa Formation
/--/--/--/--/-
Magidai Formation
/--/--/--/--/-
Kisawahata Formation
/--/--/--/--/-
[ Lower ]

Akka - Tanohata Sub-belt (Akka - Kuji, Iwate pref.)
[ Upper ]
/--/--/--/--/-
Takayashiki Unit
/--/--/--/--/-
Akka Unit
/--/--/--/--/-
Magidai Formation
/--/--/--/--/-
Kisawahata Formation
/--/--/--/--/-
[ Lower ]

North Kitakami Belt
[ Upper ]
/--/--/--/--/-
Kuzumaki - Kamaishi Sub-belt
/--/--/--/--/-
Akka - Tanohata Sub-belt
/--/--/--/--/-
[ Lower ]

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

Distribution: Magidai - Onnatomo, Oguni, Yamagata town, Kuji city, Iwate pref.; Uchimagi, Yamane town, Kuji city, Iwate pref.; Taki, Okawame town, Kuji city, Iwate pref.
Fossils (Conodonts): Epigondolella abneptis
Deposit: Bedded manganese deposit

Ehiro et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.121-139 DOI
Yoshida et al. (1987) Geology of the Rikuchu-Ono District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)