Owada Formation

[ Top ] [ Japanese ]

Owada Formation

Coherent formation
Middle - Late Jurassic, Bajocian - Kimmeridgian (Ammonoids)

Lithofacies: Shale
Lithofacies (Minor): Sandstone

Lower limit: Transitional (Ojima Formation)

Hashiura Group (Shizukawa - Tsuya, Miyagi pref.)
[ Upper ]
?--?--?--?--?-
Sodenohama Formation
--------------
Arato Formation
--------------
Aratozaki Formation
~~~~~~~~~~~~~~
[ Lower ]

Hashiura Group (Toyoma, Miyagi pref.)
[ Upper ]
~~~~~~~~~~~~~~
Nagao Formation
--------------
Nakahara Formation
~~~~~~~~~~~~~~
[ Lower ]

Hashiura Group (Ishinomaki, Miyagi pref.)
[ Upper ]
~~~~~~~~~~~~~~
Owada Formation
--------------
Ojima Formation
~~~~~~~~~~~~~~
[ Lower ]

Shizukawa-Hashiura Subbelt
[ Upper ]
?--?--?--?--?-
Hashiura Group
~~~~~~~~~~~~~~
Shizukawa Group
~~~~~~~~~~~~~~
Saragai Group
~~~~~~~~~~~~~~
Inai Group
~~~~~~~~~~~~~~
[ Lower ]

South Kitakami Belt (after Permian)
[ West ]
::::::::::::::
Shizukawa-Hashiura Subbelt
::::::::::::::
Karakuwa-Oshika Subbelt
::::::::::::::
Ofunato Subbelt
::::::::::::::
[ East ]

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

Distribution: Ibarazu, Ishinomaki city, Miyagi pref.
Fossils (Ammonoids): Kepplerites (Gowericeras) oyamai, Kepplerites (Seymourites) cf. aculicostatum, Perisphinctes (Krannosphinctes) matsushimai

Takizawa et al. (1984) Geology of the Ishinomaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 7p.)