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211 entries under creature topic. ×

4
Florissantia(noun, appearance, eocene)
4
Formiciinae(noun, appearance, eocene)
4
Galecyon(noun, appearance, eocene)
4
Gastornis(noun, appearance, paleocene)
4
Gigantostrea(noun, appearance, eocene)
4
Gobiomyidae(noun, appearance, eocene)
4
Ground sloth(expression, appearance, eocene)
4
Hanleya(noun, appearance, oligocene)
4
Hapalodectidae(noun, appearance, paleocene)
4
Hegetotheriidae(noun, appearance, eocene)
4
Heliscomyidae(noun, appearance, eocene)
4
Henricosborniidae(noun, appearance, paleocene)
4
Hesperocyoninae(noun, appearance, eocene)
4
Hoanghoniinae(noun, appearance, eocene)
4
Homalodotheriidae(noun, appearance, eocene)
4
Horusornithidae(noun, appearance, eocene)
4
Hyaenodon(noun, appearance, eocene)
4
Hyaenodontidae(noun, appearance, paleocene)
4
Hypertragulidae(noun, appearance, eocene)
4
Hypertragulus(noun, appearance, eocene)
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APASmart Define. (1970). paleogene first appearance thesaurus. Retrieved September 29, 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 29, 2026).
HarvardSmart Define 1970, paleogene first appearance thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/paleogene_first_appearance/thesaurus/related>.
MLASmart Define. "paleogene first appearance thesaurus" 1 January 1970. Web. 29 September 2026. <https://smartdefine.org/paleogene_first_appearance/thesaurus/related>