Articles

PALEOENVIRONMENTAL ANALYSIS AND CYCLICITY OF THE MUSTAHIL FORMATION (CRETACEOUS OF CENTRAL SOMALIA)

ANTONIO RUSSO, FRANCESCA BOSELLINI, CABDULQADIR MOHAMED, SAHRA YUSUF

Abstract


The Cretaceous Mustahil Formation is a marlstone-limestone unit, outcropping typically in the Fafan Valley of Ogaden (eastern Africa). A Mustahil section, measured at Bur Bitthale near Belet Uen (Cen­tral Somalia), is here described. The succession, dated as Late Aptian to Early-Middle Albian age on the basis of good faunal evidence (Orbitolina texana and Orbitolina sulxoncava), consists of two well developed thickening­coarsening sequences, where four different facies have been recognized. The cap of both sequences is repre­sented by a rudistid framework dominated by Eoradiolites lyratus. We interpret these cycles as shoaling up para­sequences, which are the result of two depositional regressions produced by the progradation of broad shallow­water carbonate systems over the adjacent ramp and deep shelf.

Keywords

Paleoenvironmental analysis; cyclicity; rudistid reef; Early Cretaceous; Somalia

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DOI: https://doi.org/10.13130/2039-4942/9029

NBN: http://nbn.depositolegale.it/urn%3Anbn%3Ait%3Aunimi-22553

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