Acta Palaeontologica Romaniae, Vol. 14 (1) 2018 - Online Articles 
PRINT ISSN 1842-371x

available online
6. 04. 2018

Abstract The Upper Cretaceous deposits exposed in the eastern part of Borod Basin (Cornitel village area, at the confluence of Stramturii Valley and Cioroi-Negru Brook) unconformably overlie rhyolitic lavas. The most common lithologies are represented by alternance of marls, sandstones and conglomerates with intercalated two carbonate litho-somes rich in rudists. Rhyolitic tuffs cap the examined section. The rudist fauna comprises the next genera: Bournonia, Gorjanovicia, Praeradiolites, Radiolites, Sphaerulites, Hippuritella and Vaccinites. A number of species belonging to the fore-mentioned genera have been recognized and taxonomically described. Rudist communities thrived in open shelf environments strongly influenced by high energy regimes and siliciclastic sedimentation during the Upper Cretaceous. Gravity flows were responsible for the processes of reworking and transport of rudists towards the slope or to the shelf slope toe.
Keywords: rudists, bivalvia, microfacies, depositional environments, Upper Cretaceous, Borod Basin, Romania.