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Chia Zairi Formation
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Chia Zairi Fm base reconstruction

Chia Zairi Fm

Period: 
Permian

Age Interval: 
Wuchiapingian – Changhsingian, Iq4


Province: 
Iraq

Type Locality and Naming

Column: N Iraq

Synonym:


Lithology and Thickness

Subdivided into three units. Lower member (Darari) consists of alternating thin bedded organic detrital limestone, dark blue limestone and massive, cliff-forming, silicified limestone with black shale beds near the base. Middle member (Satina Evaporite) comprises dolomite and solution and recrystallization formed by dissolution of anhydrite beds and recrystallized marls. The upper unit (Zinnar) comprises thin bedded organic detrital, sometimes cherty, limestone with some harder, scarp-forming silicified limestone; in the uppermost part oolitic limestones with clastic beds occur.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Regionally, the schematic strat column indicates this is the oldest unit in N Iraq

Upper contact

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

Regional extent


GeoJSON

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Fossils


Age 

Wuchiapingian – Changhsingian

Age Span: 

    Beginning stage: 
Wuchiapingian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
257.43

    Ending stage: 
Changhsingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
251.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

From S. Z. Jassim and J. C. Goff, Geology of Iraq, 2006. pg 105, Fig. 9-1: "Stratigraphic correlation of the Late Permian-Liassic Megasequence (AP6)."