The Paleogene (also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period that began 66 and ended 23.03 million years ago and comprises the first part of the Cenozoic Era.
The Paleogene (also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period that began 66 and ended 23.03 million years ago and comprises the first part of the Cenozoic Era.