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97 entries under paleocene topic. ×

2
eocene first appearance(expression, geohistory, period)
2
extant paleogene first appearance(expression, geohistory, period)
2
oligocene first appearance(expression, geohistory, period)
2
paleogene first appearance(expression, appearance, period)
1
Aequornithes(noun, creature, geohistory)
1
Afroaves(noun, creature, geohistory)
1
Afrotheria(noun, creature, geohistory)
1
Aldrovanda(noun, creature, geohistory)
1
Ampullinopsis(noun, creature, geohistory)
1
Andrias(noun, creature, geohistory)
1
Apodiformes(noun, creature, geohistory)
1
Astraea(noun, creature, geohistory)
1
Atlantogenata(noun, creature, geohistory)
1
Australidelphia(noun, creature, geohistory)
1
Bathytoma(noun, creature, geohistory)
1
Boidae(noun, creature, geohistory)
1
Boinae(noun, creature, geohistory)
1
Budgerigar(noun, creature, geohistory)
1
Callichthyidae(noun, creature, geohistory)
1
Caprimulgiformes(noun, creature, geohistory)
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APASmart Define. (1970). thanetian first appearance thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/thanetian_first_appearance/thesaurus/related
ChicagoSmart Define. 1970. "thanetian first appearance thesaurus" https://smartdefine.org/thanetian_first_appearance/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, thanetian first appearance thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/thanetian_first_appearance/thesaurus/related>.
MLASmart Define. "thanetian first appearance thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/thanetian_first_appearance/thesaurus/related>