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219 entries under appearance topic. ×

4
Extant Paleocene first appearance(expression, period, paleocene)
4
Fabiania(noun, creature, paleocene)
4
Ficopsis(noun, creature, paleocene)
4
Florentiamyidae(noun, creature, eocene)
4
Florissantia(noun, creature, eocene)
4
Formiciinae(noun, creature, eocene)
4
Galecyon(noun, creature, eocene)
4
Gastornis(noun, creature, paleocene)
4
Gigantostrea(noun, creature, eocene)
4
Gobiomyidae(noun, creature, eocene)
4
Ground sloth(expression, creature, eocene)
4
Hanleya(noun, creature, oligocene)
4
Hapalodectidae(noun, creature, paleocene)
4
Hegetotheriidae(noun, creature, eocene)
4
Heliscomyidae(noun, creature, eocene)
4
Henricosborniidae(noun, creature, paleocene)
4
Hesperocyoninae(noun, creature, eocene)
4
Hoanghoniinae(noun, creature, eocene)
4
Homalodotheriidae(noun, creature, eocene)
4
Horusornithidae(noun, creature, eocene)
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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>