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