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4 entries under oligocene topic. ×

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Extant Rupelian first appearance(expression, appearance, eocene, geogistory, period)
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extant paleogene first appearance(expression, geogistory, period)
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oligocene first appearance(expression, geohistory, geogistory, period)
6
rupelian first appearance(expression, geohistory, geogistory, period)
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APASmart Define. (1970). extant chattian first appearance thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/extant_chattian_first_appearance/thesaurus/related
ChicagoSmart Define. 1970. "extant chattian first appearance thesaurus" https://smartdefine.org/extant_chattian_first_appearance/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, extant chattian first appearance thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/extant_chattian_first_appearance/thesaurus/related>.
MLASmart Define. "extant chattian first appearance thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/extant_chattian_first_appearance/thesaurus/related>