Jauf Fm

Period:

Devonian

Age Interval:

Pragian – Emsian, Sa (1,2,4)

Province:
Saudi Arabia

Type Locality and Naming

Column: Saudi Arabia Outcrop, Saudi Arabia Subsurface, NW Saudi Arabia

Synonym:

Lithology and Thickness

It is further divided into Murayr Mbr, Hammamiyat Sequence, Upper Subbat Mbr, Lower Subbat Mbr, Qasr Mbr, Sha'iba Mbr, where it is thin beds of cream to tan, thin-bedded, hard, finely crystalline limestone (locally coral-bearing) separated by gray-green silty shale layers, with subordinate interbedded sandstone in Murayr Mbr and Hammamiyat Sequence. It is banded red and gray, silty shale with minor beds of partly micaceous, fine sandstone and siltstone common in the upper part and few in the lower part in Upper Subbat Mbr. It is Gray thin-bedded, saccharoidal to finely crystalline limestone which locally includes common reef mounds 1 to 5 meters high, grading down into grayish-green, silty shale with subordinate maroon shale and silty limestone in Lower Subbat Mbr and Qasr Mbr.

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

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

Upper contact

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

Regional extent

GeoJSON

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Fossils

Age

Pragian – Emsian

Age Span:

Beginning stage:

Pragian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

411.46

Ending stage:

Emsian

Fraction up in the ending stage:

0.75

Ending date (Ma):

398.35

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.