Adaiyah Fm

Period:

Triassic

Age Interval:

Rhaetian, Sr1, Iq2

Province:
Syria, Iraq, Iran

Type Locality and Naming

Column: Syria, Column: Central Iraq, Column: Zagros belt (general), Column: Iran East; Lowermost formation in Khane Khat Fm in Iran

Synonym:

Lithology and Thickness

In Syria, dominantly dark gray, very fine-grained to porcellaneous, siliceous, thin to medium, evenly bedded dolomite. Minor contemporaneous slump and brecciation features occur in the upper 400 feet. A conspicuous, massive, brown, porous, crystalline dolomite forms the top of the unit. 200 feet of anhydrite with subordinate thin dolomite and dark shale. (According to the paper, Khaneh Kat is a separate formation below Adaiyah, Mus, and, Alan layers, however, according to the chart, Khaneh Kat is the formation and Adaiyah, Mus, and, Alan are members of the formation.)

In Central Iraq, Evaporite. Consists of bedded anhydrites with subordinate beds of brownish limestones and black calcareous shales and greenish marls, both with anhydrite nodules. In some wells salt beds occur.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Regionally, the schematic strat column indicates the next older unit as Butmah Fm. In Iran, it is Dashtak Fm

Upper contact

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

Regional extent

GeoJSON

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Fossils

Age

Rhaetian

Age Span:

Beginning stage:

Rhaetian

Fraction up in beginning stage:

0.2

Beginning date (Ma):

204.86

Ending stage:

Rhaetian

Fraction up in the ending stage:

0.45

Ending date (Ma):

203.77

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