Bioerosional structures from the Late Pleistocene coral reef, Red Sea coast, northwest Saudi Arabia

Authors : Huriye DEMİRCAN, Abdelbaset S ELSOROGY, Talal ALHARBİ

Pages : 22-37

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Herein, 20 ichnospecies belonging to 8 ichnogenera were identified in bivalves, gastropods, and corals insert ignore into journalissuearticles values(n = 701); from the Late Pleistocene coral reef along the Red Sea coast, northwest Saudi Arabia. The trace fossils were produced by clionid sponges insert ignore into journalissuearticles values(47.39%);, endolithic bivalves insert ignore into journalissuearticles values(42.17%);, polychaete annelids insert ignore into journalissuearticles values(5.42%);, vermetid gastropods insert ignore into journalissuearticles values(3.81%);, and acrothoracican barnacles insert ignore into journalissuearticles values(1.21%);. The recognized ichnotaxa were Entobia geometrica, E. ovula, E. cf. goniodes, E. cf. retiformis, E. cretacea, Entobia isp., Gastrochaenolites torpedo, G. lapidicus, G. cf. dijugus, Gastrochaenolites isp., Oichnus paraboloides, O. simplex, Oichnus isp., Caulostrepsis taeniola, Caulostrepsis isp., Maeandropolydora cf. sulcans, Maeandropolydora isp., Renichnus isp., Centrichnus isp., and cf. Rogerella isp., Most bivalves and gastropods contain Entobia rather than Gastrochaenolites, which is commonly found in the larger and thicker corals. The content of the trace fossils indicated an Entobia ichnofacies formed in the coral reef during transgression. The habitat conditions changed gradually, from well-oxygenated, shallow, high-energy back-reef and reef crest bioeroding polychaetes and bivalves, to deep, low-energy reef slope dominated by boring sponges.
Keywords : Bioerosional structures, coral reefs, Pleistocene, Red Sea coast, Saudi Arabia