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paleogene first appearance(geohistory, appearance, geochronology)
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APASmart Define. (1970). extant paleogene first appearance thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/extant_paleogene_first_appearance/thesaurus/broader
ChicagoSmart Define. 1970. "extant paleogene first appearance thesaurus" https://smartdefine.org/extant_paleogene_first_appearance/thesaurus/broader (accessed September 25, 2026).
HarvardSmart Define 1970, extant paleogene first appearance thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/extant_paleogene_first_appearance/thesaurus/broader>.
MLASmart Define. "extant paleogene first appearance thesaurus" 1 January 1970. Web. 25 September 2026. <https://smartdefine.org/extant_paleogene_first_appearance/thesaurus/broader>