The Paleocene epoch was a time of dense forests and evolutionary experiments. The extinction of the dinosaurs and other giant reptiles at the end of the Cretaceous paved the way for mammals and birds to evolve to fill those empty niches, so many new creatures appeared. During the Paleocene the island continent of India moved north and collided with Asia. At the end of the epoch, an abrupt rise in temperature across the planet made the climate much wetter and caused a sea level rise.
Cretaceous-Tertiary mass extinction
65 million years ago
Ended: 54.8 million years ago
During this period the following extinction level events are thought to have occurred.