The Paleogene (n or n; also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that began {ma|Paleogene|and} ended {ma|Neogene|million years ago} and comprises the first part of the Cenozoic Era. Lasting 43 million years, the Paleogene is most notable as being the time in which mammals evolved from relativ...
Found on
http://en.wikipedia.org/wiki/Paleogene
A period from 65.5 to 23.03 million years ago. This is the new name given to the first portion of the Tertiary Period.
Found on
http://www.scientificpsychic.com/etc/geology-glossary.html
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