Omoriyama Formation

[ Top ] [ Japanese ]

Omoriyama Formation Sato et al., 2022

Type locality: Mount Omoriyama, Okayama city - Akaiwa city, Okayama prefecture
Coherent formation
Permian, Cisuralian - Guadalupian (322.0 Ma or younger, U-Pb)
Intruded by: Nibori Granite
Correlation: Lower Formation

Sedimentary facies: Marine
Lithofacies: Basalt lava
Lithofacies (Minor): Mudstone, Sandstones, Pillow lava, Dolerite

Upper limit: Unconformity (Dodozan Formation, Kamosaki Formation)

Maizuru Group (Wake, Okayama pref.)
[ Upper ]
/--/--/--/--/-
Omoriyama Formation
/--/--/--/--/-
[ Lower ]

Central zone (Okayama pref.)
[ Upper ]
/--/--/--/--/-
Nakaiso Conglomerate Bed
?--?--?--?--?-
Yanagi Formation
?--?--?--?--?-
Fukumoto Group
~~~~~~~~~~~~~~
Maizuru Group
/--/--/--/--/-
[ Lower ]

Maizuru Belt
[ North ]
/--/--/--/--/-
North zone
/--/--/--/--/-
Central zone
/--/--/--/--/-
South zone
/--/--/--/--/-
[ South ]

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

Distribution: Mount Omoriyama, Okayama city - Akaiwa city, Okayama pref.; Mount Zenojiyama, Kamosaki, Akaiwa city, Okayama pref.; Kumenan city - Misaki city, Kume county, Okayama pref.

Sato et al. (2022) Geology of the Wake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 106p. (in Japanese with English abstract 4p.)