ABSTRACT The non-avian dinosaurs died out at the end of the Cretaceous, ~66 million years ago, after an asteroid impact. The prevailing hypothesis is that the effects of the impact suddenly killed the
The Changhsingian (Late Permian), 4 to 5 m thick Paratirolites Limestone has yielded diverse ammonoid assemblages composed of the genera Neoaganides , Pseudogastrioceras , Dzhulf
Dataset contains abundance data for fossil mollusk genera from the Late Cretaceous of the U.S. Coastal Plain published by Sohl and Koch (1983, 1984, 1987). Also contains global stratigraphic ranges, g
The biggest known mass extinction in the history of animal life occurred at the Permian-Triassic boundary and has often been linked to global warming. Previous studies suggested that a geologically ra