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Araej Formation
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Araej Fm base reconstruction

Araej Fm


Period: 
Jurassic

Age Interval: 
Bajocian – Callovian, Qa1


Province: 
Qatar

Type Locality and Naming

Column: Qatar, Upper Araej Mbr. Uwainat Mbr. Lower Araej Mbr.

Synonym:


Lithology and Thickness

Further divided into Upper Araej Mbr. Uwainat Mbr. Lower Araej Mbr. Olive, calcareous, clay shale interbedded with white chalky limestone. Cream limestone with subordinate shale. Cream to tan limestone, mainly soft, with subordinate marl and shale, and, several prominent brown oolite beds. Cream soft limestone capped by a bed of hard oolite. Cream compact limestone with several thin calcarenite beds in upper part. Cream dense lithographic limestone, passing down into softer partly calcarenitic limestone with interbedded shale. Olive-green and golden-brown, slightly gypsiferous shale, with a few thin chalky limestone layers. Fossils scarce, none identified. Interbedded white and cream, mainly chalky, limestone and golden-brown, slightly gypsiferous clay shale; several thin hard limestone layers in lower part. Green to olive, in part varicolored clay shale, with several thin layers of calcaernite and fine sandstone in the upper part; in some places several meters of bedded gypsum at the base.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

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

Upper contact

Regionally, the schematic strat column indicates the next younger unit as Tuwaiq Mountain Limestone Fm

Regional extent


GeoJSON

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Fossils


Age 

Bajocian – Callovian

Age Span: 

    Beginning stage: 
Bajocian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
170.90

    Ending stage: 
Callovian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
163.41

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

From Middle East Geological Timescale 2008 Al-Husseini, Journal of Middle East Petroleum Geosciences v 13, no. 4.