Juwayl Fm

Period:

Permian, Carboniferous

Age Interval:

Moscovian - Sakmarian, Sa2

Province:
Saudi Arabia

Type Locality and Naming

Column: Saudi Arabia Subsurface, Column: Bahrain, Column: Kuwait; Juwayl Fm C Res, Juwayl Fm Ghazal Mbr, Juwayl Fm B Res, Juwayl Fm Jawb Mbr; Lowermost formation in Unayzah Gr

Synonym:

Lithology and Thickness

Mainly relatively poorly cemented sandstone of variable coarseness, at certain levels conglomeratic, with interbedded varicolored sandy shales, and, thin, black to brown, ironstone bearing horizons. In some areas two horizons near the middle include granitic and metamorphic rock erratics reaching 2 meters in diameter. Locally a few thin, irregular, pale gray and pastel, dense, dolomite lenses are present, particularly in the upper part.

It is further divided into Juwayl Fm C Res, Juwayl Fm Ghazal Mbr, Juwayl Fm B Res, Juwayl Fm Jawb Mbr

Lithology Pattern:

Coarse-grained sandstone

Relationships and Distribution

Lower contact

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

Upper contact

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

Regional extent

GeoJSON

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Fossils

Age

Moscovian - Sakmarian

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.3

Beginning date (Ma):

312.71

Ending stage:

Sakmarian

Fraction up in the ending stage:

0.6

Ending date (Ma):

291.71

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 1301