Paleoenvironments and Biostratigraphy of the Maastrichtian Section of the Darya River (North Caucasus)

An integrated approach to the study of the Maastrichtian deposits of the Darya River (North Caucasus) section served as a basis for reconstructing the sedimentation conditions. As a result of our research, we have made conclusions about the biotic and abiotic events of that time. The stratigraphic position of the section has been clarified and its zonal subdivision by foraminifers has been defined. The paleogeographic and paleoclimatic environments have been reconstructed. It has been revealed that there was a warm-water basin (from shallow-sea to moderately deep-water one) with a normal salinity and an irregular sedimentation rate in the region in the Maastrichtian.