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188 entries under eocene topic. ×

5
Extant Lutetian first appearance(expression, geohistory, period)
5
Extant Ypresian first appearance(expression, geohistory, period)
2
Actinidia(noun, creature, geohistory)
2
Adeonellidae(noun, creature, geohistory)
2
Adeonidae(noun, creature, geohistory)
2
Alectis(noun, creature, geohistory)
2
Alosa(noun, creature, geohistory)
2
Amphipoda(noun, creature, geohistory)
2
Amphistegina(noun, creature, geohistory)
2
Anomalure(noun, creature, geohistory)
2
Anomaluromorpha(noun, creature, geohistory)
2
Anseranatidae(noun, creature, geohistory)
2
Apogon(noun, creature, geohistory)
2
Arachnopusiidae(noun, creature, geohistory)
2
Araliaceae(noun, creature, geohistory)
2
Arctoidea(noun, creature, geohistory)
2
Argyropelecus(noun, creature, geohistory)
2
Astrononion(noun, creature, geohistory)
2
Atlanta(noun, creature, geohistory)
2
Auk(noun, creature, geohistory)
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APASmart Define. (1970). extant oligocene first appearance thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related
ChicagoSmart Define. 1970. "extant oligocene first appearance thesaurus" https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, extant oligocene first appearance thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related>.
MLASmart Define. "extant oligocene first appearance thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related>