4
Extant Lutetian first appearance(expression, geohistory, appearance, period, geochronolog)
4
Extant Ypresian first appearance(expression, geohistory, appearance, period, geochronolog)
1
Actinidia(noun, animal, geohistory, appearance)
1
Adeonellidae(noun, animal, geohistory, appearance)
1
Adeonidae(noun, animal, geohistory, appearance)
1
Alectis(noun, animal, geohistory, appearance)
1
Alosa(noun, animal, geohistory, appearance)
1
Amphipoda(noun, animal, geohistory, appearance)
1
Amphistegina(noun, animal, geohistory, appearance)
1
Anomalure(noun, animal, geohistory, appearance)
1
Anomaluromorpha(noun, animal, geohistory, appearance)
1
Anseranatidae(noun, animal, geohistory, appearance)
1
Apogon(noun, animal, geohistory, appearance)
1
Arachnopusiidae(noun, animal, geohistory, appearance)
1
Araliaceae(noun, animal, geohistory, appearance)
1
Arctoidea(noun, animal, geohistory, appearance)
1
Argyropelecus(noun, animal, geohistory, appearance)
1
Astrononion(noun, animal, geohistory, appearance)
1
Atlanta(noun, animal, geohistory, appearance)
1
Auk(noun, animal, geohistory, appearance)
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APASmart Define. (1970). extant eocene first appearance thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/extant_eocene_first_appearance/thesaurus/narrower
ChicagoSmart Define. 1970. "extant eocene first appearance thesaurus" https://smartdefine.org/extant_eocene_first_appearance/thesaurus/narrower (accessed September 26, 2026).
HarvardSmart Define 1970, extant eocene first appearance thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/extant_eocene_first_appearance/thesaurus/narrower>.
MLASmart Define. "extant eocene first appearance thesaurus" 1 January 1970. Web. 26 September 2026. <https://smartdefine.org/extant_eocene_first_appearance/thesaurus/narrower>