The extinction event may have killed some groups over a period as short as thousands of year. But the dinosaurs probably took millions of years before they became extinct. Africa breaks off from South America. After extinction of the dinosaurs, mammals radiate into ecological nitches formerly occupied by dinosaurs. Placental mammals evolve.
First primates appear in the late Cretaceous as one of the first groups of placental mammals.
Monkeys appear in the Ecocene and the first true apes appear more than 25 million years ago. India is moving north towards Asia and Australia is moving east. India has crashed into Asia, forming the Himalayan mountains. The Rocky mountains grow and the Alps form. Present Evidence indicates that a new continent may form in the future around the North Pole.