Abstract: Three Cretaceous oceanic red-bed (CORB) successions from the Eastern Carpathians of Romania were studied in detail to determine their age and depositional environments. Our investigations revealed that the studied CORBs display a variety of lithofacies, such as red shales, red radiolarites, red cherts with radiolarians, red cherts, and red claystones and marlstones with microfossils. The CORBs of the Eastern Carpathians encompass the latest Albian-Coniacian interval, based on calcareous nannofossil analyses. But the main part of the CORBs is carbonate free or has very low carbonate content; the upper part becomes increasingly more calcareous. The CORBs average 60% SiO 2 , and also includes a high amount of Fe 2 O 3 which suggests an oxic deep marine environment. The CORBs of the Eastern Carpathians, overlying Albian black shale lithofacies, are similar in lithology and age to other Tethyan CORBs. CORB deposition indicates significant paleoenvironmental changes, from an anoxic setting to an oxic one, across the Early-Late Cretaceous boundary interval. KEY WORDS: Eastern Carpathians, CORBs, lithofacies, biostratigraphy, paleoenvironment

Abstract Several types of graded bedding have been recognized in sediments collected from the central Black Sea. The grading types, matrix content, grain-size distribution, and pulsations in the vertical size distribution provide data on the dynamics of the turbidity currents that deposited these sediments.