Marrat Fm

Period:

Jurassic

Age Interval:

Pliensbachian – Toarcian, Sa (1,2), Bn1, Kw1, Qa1, UAE1

Province:
Saudi Arabia, Bahrain, Kuwait, Qatar, United Arab Emirates

Type Locality and Naming

Column: Saudi Arabia Outcrop, Saudi Arabia Subsurface, Bahrain, Kuwait, Qatar, United Arab Emirates

Synonym:

Lithology and Thickness

In schematic strat column, it is divided into three layers, Golden brown to tan-weathering, light, gray, dense limestone with several beds of oolite; small amounts of tan clay shale near base in upper part. Dark brick red, in part silty shale, with a few thin, light-green layers, a zone of ripple marked, silty, fine, quartz sandstone in the upper part; one thin layer of limestone like that of the upper Marrat 2 m below top in the middle part. Yellowish tan to gray, compact limestone and dolomite of varying hardness, with subordinate tan, sandy shale and buff, fine to medium-grained calcareous quartz sandstone in the lower part; locally a soft, chalky fossiliferous zone at the top in the lower part.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Regionally, the schematic strat column indicates the next older unit as Minjur Fm. In Qatar and United Arab Emirates, it is Hamlah Fm

Upper contact

Regionally, the schematic strat column indicates the next younger unit as Dhruma Fm. In Qatar, it is Araej Fm. In United Arab Emirates, it is Izhara Fm

Regional extent

GeoJSON

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Fossils

Age

Pliensbachian – Toarcian

Age Span:

Beginning stage:

Pliensbachian

Fraction up in beginning stage:

0.9

Beginning date (Ma):

185.07

Ending stage:

Toarcian

Fraction up in the ending stage:

1.0

Ending date (Ma):

174.70

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. Steineke et. al., 1958, Page 1305