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Oginohama Formation

Oginohama Fm


Period: 
Jurassic

Age Interval: 
Jurassic (Oxfordian), (8j)


Province: 
South Kitakami Belt-Central Sub-belt

Type Locality and Naming

the Karakuwa-Oshika Sub-belt; Oshika Peninsula

Synonym:


Lithology and Thickness

It is composed of sandstone and alternating beds of sandstone and mudstone with intercalated conglomerate, and has been divided into the Kitsunezaki, Makinohama. Kozumi and Fukiura members (Takizawa et at., 1974).


Lithology Pattern: 
Sandy_claystone


Relationships and Distribution

Lower contact

Regionally, the schematic strat column indicates the next older unit as Tsukinoura Fm

Upper contact

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

Regional extent


GeoJSON

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Fossils

The Oginohama Formation yieids Oxfordian-Tithonian ammonoids (lnai & Takahashi 1940; Sato 1962: Takahashi 1969; Takizawa et a1., 1974) and abundant plant fossils belonging to the Ryoseki Flora (Kimura & Ohana 1989a, b).


Age 

Jurassic (Oxfordian)

Age Span: 

    Beginning stage: 
Oxfordian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
161.53

    Ending stage: 
Kimmeridgian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
149.24

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.