Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Nagao Formation

Nagao Fm


Period: 
Jurassic

Age Interval: 
Middle Jurassic (Bajocian-Kimmeridgian), (8f)


Province: 
South Kitakami Belt-Western Sub-belt

Type Locality and Naming

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

Synonym:


Lithology and Thickness

It comprises bedded mudstone with alternating beds of sandstone and mudstone


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

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

Upper contact

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

Regional extent

Shizugawa (Shizukawa)-Hashiura Sub-belt; Hashiura area. Coeval with Arato Fm; Owada Fm


GeoJSON

null

Fossils


Age 

Shown as Middle Jurassic-Early Cretaceous, hence placed 50% up in Bajocian

Age Span: 

    Beginning stage: 
Bajocian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
169.54

    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.