Butmah Fm

Period:

Triassic

Age Interval:

Norian – Rhaetian, Sr1, Iq2

Province:
Syria, Iraq

Type Locality and Naming

Column: Syria, Column: Central Iraq

Synonym: In Central Iraq, it contains a sandy unit called the Mileh Tharthar Clastics Fm

Lithology and Thickness

In Syria, average thickness of 600m, this formation is a heterogenous aggregate of sediments: consists of oolitic limestones, reef limestones, shales, interbedded anhydrites, and sandy limestones, all interbedded and present in comparable amounts. Very fossiliferous, with many gastropods (unidentified), microfossil debris, fish debris, and sponge spicules present.

In Central Iraq, Lithologically heterogeneous. Upper part consists of oolitic, pseudo-oolitic, and detrital limestone with beds of clayey limestone, shale, and anhydrite. The middle part is oolitic and pseudo-oolitic, clayey, and dolomitic with sandstone and shale beds. The lower part is composed of limestone with bedded anhydrite. 500m thick at type section

Lithology Pattern:

Oolitic limestone

Relationships and Distribution

Lower contact

Regionally, the schematic strat column indicates the next older unit as Kurra Chine Fm in Syria. In Central Iraq, it is Mileh Tharthar Clastics Fm

Upper contact

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

Regional extent

GeoJSON

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Fossils

Age

Norian – Rhaetian

Age Span:

Beginning stage:

Norian

Fraction up in beginning stage:

0.85

Beginning date (Ma):

208.97

Ending stage:

Rhaetian

Fraction up in the ending stage:

0.2

Ending date (Ma):

204.86

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