CRETACEOUS

145-66 MYA

Flowering Plants Began to Appear and Began to Rapidly Diversify, Dinosaurs Still Dominate, Mass Extinction at The End of This Period

In addition to its most famous victims, the non-avian dinosaurs, the K-Pg event caused the extinction of pterosaurs and extinguished many species of early mammals and a host of amphibians, birds, reptiles, and insects. Life in the seas was also badly disrupted, with damage to the oceans causing the extinction of marine reptiles like mosasaurs and plesiosaurs, as well as of ammonites, then one of the most diverse families of animals on the planet.
In all, scientists estimate that 75 percent of species living at the time of the K-Pg extinction were wiped out.