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Sargelu Formation
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Sargelu Fm base reconstruction

Sargelu Fm

Period: 
Jurassic

Age Interval: 
Toarcian, Iq (2,4), Ir (1,3), Sr1, Kw1


Province: 
Iraq, Iran, Syria, Kuwait

Type Locality and Naming

Columns: Central Iraq, N Iraq, Zagros belt (general), Iran East, Syria, Kuwait; Uppermost formation in Riyadh Gr

Synonym:


Lithology and Thickness

Comprises thin-bedded, black, bituminous and dolomitic limestones, and black papery shales with streaks of thin black chert. Subsurface sections contain a higher proportion of shale and occasional very fine-grained sandstone beds. 115m thick at type section.

Syria: Coarse-grained Sandstone. Oolitic and sandy, marly argillaceous limestone; argillaceous limestone marl and shale source-rock. Dark gray limestone and dark gray shale.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Regionally, the schematic strat column indicates the next older unit as Muhaiwir Fm in Central Iraq. Sehkaniyan Fm in N Iraq. Khane Khat Fm in Zagros sedimentary basin (general). In Kuwait, it is Dhruma Fm. In Syria, it is Mus Fm

Upper contact

Regionally, the schematic strat column indicates the next younger unit as Najmah Fm in Central Iraq and Zagros sedimentary basin (general) and Kuwait. Naokelekan Fm in N Iraq. In Syria, it is Qamchuka Fm

Regional extent


GeoJSON

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Fossils


Age 

Bajocian-Callovian in Zagros belt, latest-Bajocian through middle Bathonian in Kuwait, Aalenian to mid-Callovian in Central Iraq, N. Iraq. Generalized here as mid-Aalenian through Bathonian

Age Span: 

    Beginning stage: 
Aalenian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
172.80

    Ending stage: 
Bathonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
165.29

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

From S. Z. Jassim and J. C. Goff, Geology of Iraq, 2006. pg 124, Fig. 11-1: "Stratigraphic correlation of formation of Megasequence AP8."