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34 entries under oligocene topic. ×

6
Extant Oligocene first appearance(expression, geohistory, period)
5
Chattian first appearance(expression, geohistory, period)
5
Rupelian first appearance(expression, geohistory, period)
2
Aceratheriinae(noun, creature, geohistory)
2
Afossochiton(noun, creature, geohistory)
2
Ailuridae(noun, creature, geohistory)
2
Amphechinus(noun, creature, geohistory)
2
Andrias scheuchzeri(expression, creature, geohistory)
2
Borophaginae(noun, creature, geohistory)
2
Chubutherium(noun, creature, geohistory)
2
Dromornithidae(noun, creature, geohistory)
2
Ekgmowechashala(noun, creature, geohistory)
2
Hanleya(noun, creature, geohistory)
2
Kentriodontidae(noun, creature, geohistory)
2
Mammacyon(noun, creature, geohistory)
2
Merycochoerus(noun, creature, geohistory)
2
Miotylopus(noun, creature, geohistory)
2
Neocynodesmus(noun, creature, geohistory)
2
Octodontotherium(noun, creature, geohistory)
2
Orophodontidae(noun, creature, geohistory)
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APASmart Define. (1970). paleocene first appearance thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/paleocene_first_appearance/thesaurus/related
ChicagoSmart Define. 1970. "paleocene first appearance thesaurus" https://smartdefine.org/paleocene_first_appearance/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, paleocene first appearance thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/paleocene_first_appearance/thesaurus/related>.
MLASmart Define. "paleocene first appearance thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/paleocene_first_appearance/thesaurus/related>