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Paleogene extinction(extinction, geochronology, fossil)
2
Paleogene first appearance(appearance, geochronology, fossil)
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Paleogene life(geology, life, geochronology)
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APASmart Define. (1970). paleogene fossil record thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/paleogene_fossil_record/thesaurus/narrower
ChicagoSmart Define. 1970. "paleogene fossil record thesaurus" https://smartdefine.org/paleogene_fossil_record/thesaurus/narrower (accessed September 26, 2026).
HarvardSmart Define 1970, paleogene fossil record thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/paleogene_fossil_record/thesaurus/narrower>.
MLASmart Define. "paleogene fossil record thesaurus" 1 January 1970. Web. 26 September 2026. <https://smartdefine.org/paleogene_fossil_record/thesaurus/narrower>