BENTHIC FORAMINIFERA ACROSS THE CRETACEOUS/PALEOGENE BOUNDARY IN THE EASTERN TETHYS (NORTHERN ALBORZ, GALANDERUD SECTION): EXTINCTION PATTERN AND PALEOENVIRONMENTAL RECONSTRUCTION

摘要

Extinction patterns, paleobathymetric inferences, and paleoenvironmental changes based on benthic foraminifera were investigated across the Cretaceous/Paleogene (K/Pg) boundary at the Galanderud section (Northern Alborz, Iran), which contains one of the most continuous and expanded K/Pg transitions in the eastern Tethys. On the basis of benthic foraminiferal taxa abundance and distribution, an outer neritic to uppermost bathyal paleo-depositional setting is inferred. In addition, benthic foraminiferal assemblages and planktic/benthic ratios do not indicate any major change in relative sea level during latest Maastrichtian-early Danian time.