There is a period of time that starts from the end of the Cretaceous Period million years ago.
The Cretaceous ( [ pronkrᵻˈteɪʃəs ] , ) is a geologic period and system that spans 79 million years from the end of the Jurassic Period million years ago ( Mya ) to the beginning of the Paleogene Period Mya . The Paleogene ( [ pronˈpæliːədʒiːn ] or [ ˈpeɪliːədʒiːn ] also spelled Palaeogene or Palæogene ; informally Lower Tertiary ) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago ( Mya ) to the beginning of the Neogene Period Mya .