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34 entries under oligocene topic. ×

4
Extant Oligocene first appearance(expression, geohistory, appearance, period)
4
Chattian first appearance(expression, geohistory, period)
4
Rupelian first appearance(expression, geohistory, period)
1
Aceratheriinae(noun, creature, geohistory)
1
Afossochiton(noun, creature, geohistory)
1
Ailuridae(noun, creature, geohistory)
1
Amphechinus(noun, creature, geohistory)
1
Andrias scheuchzeri(expression, creature, geohistory)
1
Borophaginae(noun, creature, geohistory)
1
Chubutherium(noun, creature, geohistory)
1
Dromornithidae(noun, creature, geohistory)
1
Ekgmowechashala(noun, creature, geohistory)
1
Hanleya(noun, creature, geohistory)
1
Kentriodontidae(noun, creature, geohistory)
1
Mammacyon(noun, creature, geohistory)
1
Merycochoerus(noun, creature, geohistory)
1
Miotylopus(noun, creature, geohistory)
1
Neocynodesmus(noun, creature, geohistory)
1
Octodontotherium(noun, creature, geohistory)
1
Orophodontidae(noun, creature, geohistory)
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APASmart Define. (1970). eocene first appearance thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/eocene_first_appearance/thesaurus/related
ChicagoSmart Define. 1970. "eocene first appearance thesaurus" https://smartdefine.org/eocene_first_appearance/thesaurus/related (accessed September 30, 2026).
HarvardSmart Define 1970, eocene first appearance thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/eocene_first_appearance/thesaurus/related>.
MLASmart Define. "eocene first appearance thesaurus" 1 January 1970. Web. 30 September 2026. <https://smartdefine.org/eocene_first_appearance/thesaurus/related>