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During the Late Cretaceous, marine organisms experienced significant changes   in their biodiversity. These diversity changes were influenced, particularly,   by the Oceanic Anoxic Event 2 near the Cenomanian/Turonian boundary (93.6   Ma). Here, stratigraphic ranges of 80 marine macroinvertebrate genera   (cephalopods, brachiopods, gastropods, corals, and echinoids) were employed   to assess the Late Cretaceous biodiversity dynamics in the Eastern Caucasus,   which covered a large region located in the northern Neo-Tethys Ocean. Our   results outline three prominent diversity minima, which occurred in the late   Cenomanian-late Turonian, the early Santonian-late Campanian, and the late   Maastrichtian. Probably, the latter two were just local. Despite of some   differences in trends between the regional and global marine biodiversity   dynamics, the late Cenomanian-late Turonian biotic crisis appeared both on   the regional and global scales and was probably a long-term consequence of   the Oceanic Anoxic Event 2. Oxygen depletion and eustaticallydriven shoreline   shifts are considered as plausible causes of the observed biodiversity   dynamics

Late Cretaceous marine biodiversity dynamics in the Eastern Caucasus, northern Neo-Tethys ocean: Regional imprints of global events