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Akashat Formation
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Akashat Fm base reconstruction

Akashat Fm

Period: 
Cretaceous, Paleogene

Age Interval: 
Maastrichtian – Thanetian, Iq3


Province: 
Iraq

Type Locality and Naming

Column: Rutba Uplift (W Iraq)

Synonym:


Lithology and Thickness

The lowest unit consists of buff to grey shale and white chalk. The middle unit consists of sandstone which is yellowish, quarzitic and often phosphatic with occasional beds of silicified shelly limestone. The upper unit consists of micrite limestone and chert. Thickness varies between type sections.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

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

Upper contact

Regionally, the schematic strat column indicates the next younger unit as Ratga 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 upper unit consists of foraminiferal biomicrite and micrite with recrystallized planktonic tests often alternating with sparite, with broken bivalve shell fragments, including large Lenticulina sp.


Age 

Maastrichtian - Thanetian

Age Span: 

    Beginning stage: 
Maastrichtian

    Fraction up in beginning stage: 
0.9

    Beginning date (Ma): 
66.65

    Ending stage: 
Thanetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
56.00

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"