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219 entries under appearance topic. ×

4
Machaeroides(noun, creature, eocene)
4
Macraucheniidae(noun, creature, eocene)
4
Mammacyon(noun, creature, oligocene)
4
Merycochoerus(noun, creature, oligocene)
4
Merycoidodontoidea(noun, creature, eocene)
4
Mesonychid(noun, creature, paleocene)
4
Mesonychidae(noun, creature, paleocene)
4
Mesonyx(noun, creature, eocene)
4
Mesotheriidae(noun, creature, eocene)
4
Miacidae(noun, creature, paleocene)
4
Miohippus(noun, creature, eocene)
4
Miotylopus(noun, creature, oligocene)
4
Mixodectidae(noun, creature, paleocene)
4
Nanotragulus(noun, creature, eocene)
4
Neocynodesmus(noun, creature, oligocene)
4
Notharctidae(noun, creature, eocene)
4
Notharctinae(noun, creature, eocene)
4
Notohippidae(noun, creature, eocene)
4
Notostylopidae(noun, creature, eocene)
4
Notoungulata(noun, creature, paleocene)
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APASmart Define. (1970). paleogene first appearance thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/paleogene_first_appearance/thesaurus/related
ChicagoSmart Define. 1970. "paleogene first appearance thesaurus" https://smartdefine.org/paleogene_first_appearance/thesaurus/related (accessed September 30, 2026).
HarvardSmart Define 1970, paleogene first appearance thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/paleogene_first_appearance/thesaurus/related>.
MLASmart Define. "paleogene first appearance thesaurus" 1 January 1970. Web. 30 September 2026. <https://smartdefine.org/paleogene_first_appearance/thesaurus/related>