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30 entries under oligocene topic. ×

2
Eumorphocorystes(noun, extinction, genus)
2
Proplatyarthrus(noun, extinction, genus)
1
Afrotarsius(noun, fauna, extinction)
1
Archaeohyrax(noun, fauna, extinction)
1
Bennettitales(noun, fauna, extinction)
1
Caedocyon(noun, fauna, extinction)
1
Calamophylliopsis(noun, fauna, extinction)
1
Cormocyon(noun, fauna, extinction)
1
Cymatoceras(noun, fauna, extinction)
1
Cymatoceratidae(noun, fauna, extinction)
1
Eosimiidae(noun, fauna, extinction)
1
Florissantia(noun, fauna, extinction)
1
Groeberiidae(noun, fauna, extinction)
1
Hercoglossidae(noun, fauna, extinction)
1
Holosteus(noun, fauna, extinction)
1
Hyporhina(noun, fauna, extinction)
1
Leptauchenia(noun, fauna, extinction)
1
Leptictida(noun, fauna, extinction)
1
Miohippus(noun, fauna, extinction)
1
Multituberculata(noun, fauna, extinction)
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APASmart Define. (1970). chattian extinction thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/chattian_extinction/thesaurus/related
ChicagoSmart Define. 1970. "chattian extinction thesaurus" https://smartdefine.org/chattian_extinction/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, chattian extinction thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/chattian_extinction/thesaurus/related>.
MLASmart Define. "chattian extinction thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/chattian_extinction/thesaurus/related>