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91 entries under paleocene topic. ×

2
Aequornithes(noun, creature, geohistory)
2
Afroaves(noun, creature, geohistory)
2
Afrotheria(noun, creature, geohistory)
2
Aldrovanda(noun, creature, geohistory)
2
Alligatorinae(noun, creature, geohistory)
2
Ampullinopsis(noun, creature, geohistory)
2
Andrias(noun, creature, geohistory)
2
Anguillidae(noun, creature, geohistory)
2
Apodiformes(noun, creature, geohistory)
2
Astraea(noun, creature, geohistory)
2
Atlantogenata(noun, creature, geohistory)
2
Australidelphia(noun, creature, geohistory)
2
Bathytoma(noun, creature, geohistory)
2
Boidae(noun, creature, geohistory)
2
Boinae(noun, creature, geohistory)
2
Bonefishes(noun, creature, geohistory)
2
Budgerigar(noun, creature, geohistory)
2
Caiman(noun, creature, geohistory)
2
Callichthyidae(noun, creature, geohistory)
2
Caprimulgiformes(noun, creature, geohistory)
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APASmart Define. (1970). extant oligocene first appearance thesaurus. Retrieved October 2, 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 2, 2026).
HarvardSmart Define 1970, extant oligocene first appearance thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related>.
MLASmart Define. "extant oligocene first appearance thesaurus" 1 January 1970. Web. 2 October 2026. <https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related>