 Ichthyornitheans became extinct at the Cretaceous–Paleogene boundary, along with enantiornitheans, all other non-avian dinosaurs, and many other animal and plant groups.The earliest known ichthyornitheans appear in the fossil record about 95 million years ago, during the Cenomanian age of the Late Cretaceous.Based on fragmentary fossil remains, the two known species present in the Ashville Formation have not been given names, but overall were very similar to "Ichthyornis dispar".