Oc Unit

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Oc Unit Kawamura, 2010

Type locality: Nakao, Ochi, Shimonoseki city, Yamaguchi prefecture
Coherent formation
Middle Jurassic, Bathonian - Callovian (Plants)

Sedimentary facies: Marine
Sedimentary facies: Lower slope of fan delta and prodelta slope in a inner bay
Sedimentary facies: Turbidite
Depth of water: Shallow (shallower than fair-weather wave base)
Lithofacies: Acidic tuff, Acidic tuffaceous mudstone - sandstone, Sandstone
Sedimentary structures: Parallel stratification, Cross stratification, Wave-formed ripples

Lower limit: bottom of acidic tuff bed or sandstone bed

Ohchi Formation
[ Upper ]
~~~~~~~~~~~~~~
Oc Unit
--------------
Oa Unit / Ob Unit
-------'''/,,,
[ Lower ]

Toyora Group
[ Upper ]
~~~~~~~~~~~~~~
Ohchi Formation
-------'''/,,,
Utano Formation
--------------
Nishinakayama Formation
--------------
Higashinagano Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Nakao, Ochi, Shimonoseki city, Yamaguchi pref.; Takaji pass, Shimonoseki city, Yamaguchi pref.; Nanami, Kikukawa village, Shimonoseki city, Yamaguchi pref.
Fossils: Phycosiphon isp.

Kawamura (2010) Jour. Geol. Soc. Japan, vol.116, no.1, pp.27-44 DOI