1882, in the meaning defined above
borrowed from German paläogen, adjective, from paläo- paleo- + -gen (in neogen neogene)
Term introduced by the German geologist Carl Friedrich Naumann (1797-1873) in Lehrbuch der Geognosie, 2. Auflage, 3. Band (Leipzig, 1866), p 8.
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“Paleogene.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Paleogene. Accessed 17 Oct. 2021.
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