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3 entries under geochronology topic. ×

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Extant Eocene first appearance(expression, geohistory, appearance)
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Extant Oligocene first appearance(expression, geohistory, appearance)
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Extant Paleocene first appearance(expression, geohistory, appearance)
For more, visit Extant_paleogene_first_appearance on Power Thesaurus
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APASmart Define. (1970). extant paleogene first appearance thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/extant_paleogene_first_appearance/thesaurus/narrower
ChicagoSmart Define. 1970. "extant paleogene first appearance thesaurus" https://smartdefine.org/extant_paleogene_first_appearance/thesaurus/narrower (accessed October 1, 2026).
HarvardSmart Define 1970, extant paleogene first appearance thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/extant_paleogene_first_appearance/thesaurus/narrower>.
MLASmart Define. "extant paleogene first appearance thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/extant_paleogene_first_appearance/thesaurus/narrower>