1
Asterostomatidae(noun, animal, geohistory, appearance)
1
Astrapotheriidae(noun, animal, geohistory, appearance)
1
Azibiidae(noun, animal, geohistory, appearance)
1
Bartonian first appearance(expression, appearance, period, geochronology)
1
Barytherium(noun, animal, geohistory, appearance)
1
Basilosaurinae(noun, animal, geohistory, appearance)
1
Bear dog(expression, animal, geohistory, appearance)
1
Borhyaenidae(noun, animal, geohistory, appearance)
1
Bothriogenys(noun, animal, geohistory, appearance)
1
Brontotheriidae(noun, animal, geohistory, appearance)
1
Cercamoniinae(noun, animal, geohistory, appearance)
1
Chalicothere(noun, animal, geohistory, appearance)
1
Chalicotherioidea(noun, animal, geohistory, appearance)
1
Coeloma(noun, animal, geohistory, appearance)
1
Conoclypus(noun, animal, geohistory, appearance)
1
Cosmopolitodus hastalis(expression, animal, geohistory, appearance)
1
Cynodictis(noun, animal, geohistory, appearance)
1
Daphoenus(noun, animal, geohistory, appearance)
1
Dermotherium(noun, animal, geohistory, appearance)
1
Diamantomyidae(noun, animal, geohistory, appearance)
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APASmart Define. (1970). eocene first appearance thesaurus. Retrieved September 25, 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 25, 2026).
HarvardSmart Define 1970, eocene first appearance thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/eocene_first_appearance/thesaurus/narrower>.
MLASmart Define. "eocene first appearance thesaurus" 1 January 1970. Web. 25 September 2026. <https://smartdefine.org/eocene_first_appearance/thesaurus/narrower>