2
Ecphora(noun, animal, geohistory, appearance)
2
Palaeocarpilius(noun, animal, geohistory, appearance)
1
Acer dettermani(expression, animal, geohistory, appearance)
1
Acer ivanofense(expression, animal, geohistory, appearance)
1
Adapidae(noun, animal, geohistory, appearance)
1
Adapiformes(noun, animal, geohistory, appearance)
1
Adapinae(noun, animal, geohistory, appearance)
1
Afrotarsius(noun, animal, geohistory, appearance)
1
Ambulocetidae(noun, animal, geohistory, appearance)
1
Amynodontidae(noun, animal, geohistory, appearance)
1
Anchitheriinae(noun, animal, geohistory, appearance)
1
Ancylopoda(noun, animal, geohistory, appearance)
1
Anoplotheriidae(noun, animal, geohistory, appearance)
1
Anthracotheriidae(noun, animal, geohistory, appearance)
1
Anthracotherium(noun, animal, geohistory, appearance)
1
Archaeohyrax(noun, animal, geohistory, appearance)
1
Archaeopithecidae(noun, animal, geohistory, appearance)
1
Archaeotherium(noun, animal, geohistory, appearance)
1
Arsinoitheriidae(noun, animal, geohistory, appearance)
1
Asiadapinae(noun, animal, geohistory, appearance)
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APASmart Define. (1970). eocene first appearance thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/eocene_first_appearance/thesaurus/narrower
ChicagoSmart Define. 1970. "eocene first appearance thesaurus" https://smartdefine.org/eocene_first_appearance/thesaurus/narrower (accessed September 24, 2026).
HarvardSmart Define 1970, eocene first appearance thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/eocene_first_appearance/thesaurus/narrower>.
MLASmart Define. "eocene first appearance thesaurus" 1 January 1970. Web. 24 September 2026. <https://smartdefine.org/eocene_first_appearance/thesaurus/narrower>