Abstract
ABSTRACT The present article describes the Middle Eocene Echinoids fauna from the Dammam formation that has been investigated on the Ras Abrouq peninsula, near the town of Zekreet, the western part of Qatar. The circa 4 km long section where the fossils have been identified, consists of a carbonate-dominated lower part and a silica-rich calcareous upper part, corresponding to a general transgression/regression cycle. A total of 25 Echinoid species belonging to 16 genera are described. Various echinoids assemblages were distinguished, which differ with respect to the species diversity and sedimentary environment. Mainly the following two assemblages, as defined by Kroh A. and Nebelsick J. H., are represented: regular Echinoid (Phymosomatoida Order, Porosoma genus) in the lower part of the formation, ‘Spatangoid’ assemblage: it includes Schizaster, Linthia, Eupatagus, Opissaster, Hemiaster and Brissopsis genera in the lower part of the formation, ‘Cassiduloid’ assemblage: it includes Echinolampas and Petalobrissus genera in the upper part of the formation.
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