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Kojima Formation

Kojima Fm


Period: 
Jurassic

Age Interval: 
Middle Jurassic (Bajocian), (8g)


Province: 
South Kitakami Belt-Western Sub-belt

Type Locality and Naming

Shizugawa (Shizukawa)-Hashiura Sub-belt; Mizunuma area

Synonym:


Lithology and Thickness

It consists mainly of arkose in association with conglomerate and alternating beds of sandstone and mudstone


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Regionally, the schematic strat column indicates the next older unit as Saragai Gr

Upper contact

Regionally, the schematic strat column indicates the next younger unit as Owada Fm

Regional extent

Shizugawa (Shizukawa)-Hashiura Sub-belt; Mizunuma area. Coeval with Aratozaki Fm; Nakahara Fm


GeoJSON

null

Fossils


Age 

Shown as Middle Jurassic-Early Cretaceous, hence placed Base of Bajocian

Age Span: 

    Beginning stage: 
Bajocian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
170.90

    Ending stage: 
Bajocian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
169.54

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Moreno, T., Wallis, S., Kojima, T. & Gibbons, W. (Eds) 2016. The Geology of Japan. Geological Society. London. 1-24.