Cenozoic

Mesozoic

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Shagara Formation

Shagara Fm

Period:

Quaternary

Age Interval:

Pleistocene

Province:
Sudan E

Type Locality and Naming

Red Sea coastal area of Sudan. The Abu Shagara Gr can be subdivided into a clastic (Wardan Fm) underlying a distinct carbonate (Shagara Fm)

Synonym: Abu Shagara Fm

Reference section: Eltayib, 2016; Eltayib et al., 2019

[Figure 1. Index map of the Red Sea showing extent of the Red Sea Basin total petroleum system (from Lindquist, 1998).]

[Figure 2. Syn- and Post-Rift Red Sea Stratigraphy - Oligocene to Recent (from Lindquist, 1998)]

[Figure 3. Pre-Rift Red Sea Stratigraphy - Precambrian to Oligocene (from Lindquist, 1998).]

[Figure 4. Index map of the Red Sea region showing generalized geology and discussed locations (after Mitchell and others, 1992, extracted from Lindquist, 1998).]

[Figure 5. Lithostratigraphic Column of the Study Area (Modified After Eltayib, 2016, from Eltayib et al., 2019).]

[Figure 6. Stratigraphic column for the Sudanese Red Sea, based on surface geology and limited coastal exploration wells (after Bunter, 1989). Extracted from]

Lithology and Thickness

Eltayih et al. (2019) show it as limestone; but their text says: It is represented by mixed lithotypes consisting of marine sand/sandstone section intercalated with claystone and partially with thin streaks of dolomite, anhydrite and limestone. It is characterized by loose, colourless, poorly sorted, with traces of mica, slightly glauconitic, traces of carbonaceous matter, feldspars, partly dominated by carbonates of reefal facies. The topmost part is represented by raised beaches and reef terraces in the outcrops being mixed with alluvial fan delta sediments. The thickness ranges be-tween 217-1240 m (Eltayib, 2016; Eltayib et al., 2019). [Used their figure which implies limestone dominates.]

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

Wardan Fm

Upper contact

present surface

Regional extent

Red Sea coastal area of Sudan.

GeoJSON

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Fossils

Age

Pleistocene

Age Span:

Beginning stage:

Gelasian

Fraction up in beginning stage:

0.00

Beginning date (Ma):

2.58

Ending stage:

Holocene

Fraction up in the ending stage:

1.00

Ending date (Ma):

0.00

Depositional setting

Shallow marine (Elkareem et al., 2022)

Depositional pattern:

Additional Information

Compiler:

Enam O. Obiosio, Solomon Joshua Avong and Henry Nasir Suleiman (2024) - Stratigraphic Lexicon compiled from the following publications:

Bunter, M.A.G. and Abdel Magid, A.E.M. (1989): The Sudanese Red Sea: New Development in Stratigraphy and Petroleum Geological Evolution. Jour. Petroleum Geology, 12: 145-166. https://doi.org/10.1111/j.1747-5457.1989.tb00230.x

Elkareem, E.M.I.A., Osman, W.R., Ferguson, A.J., Warren, J.K. and Mohamed, N.E. (2022): New Evidence of the Holokinetic Sequences around Suakin-1 and -2 in the Sudanese Red Sea Area Using Integrated Geophysical Interpretation. International Journal of Geosciences, 13: 483-497. https://doi.org/10.4236/ijg.2022.136026

Eltayib, S.H.M.A., Abdelrahman, E.S.M., Ibrahim, A.S.M., Al-Imam, O.A.O.. (2019): Sedimentary petro graphic characteristics of Zeit Formation (Suakin-1 Well) in Sudanese Red Sea Basin. Int Jour Advanced Geosciences. 7: 10-17.

Yagoub, A.M. (2007): Preliminary sequence stratigraphy and tectonic evolution of the Tokar Delta, (Southern Sudanese Red Sea). Qatar Univ. Sci . J. 27: 85- 98.