The second epoch of the Paleogene period, spanning 56 million to 33.9 million years ago. It opened with a sharp global warming spike, the Paleocene-Eocene Thermal Maximum, and saw the diversification of early modern mammal groups before a long term cooling trend set in toward its end. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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1. Paleogene (Wikipedia)
Wikimedia FoundationLead sectionQuote, Lead section
The Paleogene Period (IPA: PAY-lee-ə-jeen, -lee-oh-, PAL-ee-; also spelled Palaeogene or Palæogene) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period 66 Ma (million years ago) to the beginning of the Neogene Period 23.04 Ma.
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