Omoto Formation

It had been defined as a member of Taro Belt. Nowadays, it is interpreted as a part of Akka-Tanohata Sub-belt in North Kitakami Belt.

Accretionary complex
Volcanic rocks
Accretion: Jurassic

Lithofacies: Interbedded mudstone and siltstone

Upper limit: Unconformity (Miyako Group)

Rikuchu Group
[ Upper ]
/--/--/--/--/-
Harachiyama Formation
--------------
Omoto Formation
--------------
Koshimeguri Formation
--------------
Magisawa Formation
/--/--/--/--/-
[ Lower ]

Taro Belt
[ Upper ]
/--/--/--/--/-
Rikuchu Group
/--/--/--/--/-
[ Lower ]

northern Iwate pref.
[ East ]
/--/--/--/--/-
Taro Belt
/--/--/--/--/-
Iwaizumi Belt
/--/--/--/--/-
North Kitakami Belt (sunsu lato)
/--/--/--/--/-
[ West ]

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

Distribution: northern part of Miyako city, Iwate pref.
Fossils (Ryoseki-type flora): Plants

Yoshida and Katada (1984) Geology of the Miyako District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 44p. (in Japanese with English abstract 6p.)
Shimazu et al. (1970) Geology of the Taro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 6p.)