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Tayarat Formation
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Tayarat Fm base reconstruction

Tayarat Fm

Period: 
Cretaceous

Age Interval: 
Maastrichtian, Iq3


Province: 
Iraq

Type Locality and Naming

Column: Rutba Uplift (W Iraq)

Synonym:


Lithology and Thickness

The lower unit of the Tayarat Formation comprises conglomerate of coarse-grained calcareous sandstone, passing upwards into dolomitic limestone, dolomite, siltstone, silty marl, and calcareous shale. The upper unit comprises coarse grained limestone, locally sandy, overlain by mudstone and dolomitic conglomerate. Geodes and chert concretions are common in the carbonates of the upper unit. In S Iraq, the formation is up to 370m thick in the S part of Salman and Mesopotamian zones.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

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

Upper contact

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

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[39.46,32.74],[39.29,32.46],[39.43,32.14],[39.97,32.04],[40.05,32.1],[40.04,32.34],[39.95,32.64],[39.46,32.74]]]]}}

Fossils

The lower unit of the Tayarat Formation locally containing shark teeth and thin-shelled gastropods.


Age 

Maastrichtian

Age Span: 

    Beginning stage: 
Maastrichtian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
70.33

    Ending stage: 
Maastrichtian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
68.49

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

From S. Z. Jassim and J. C. Goff, Geology of Iraq, 2006. pg 141, Fig. 12-1: "Stratigraphic correlation of formations of the Late Early Turonian-Danian Megasequence"