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10 entries under oligocene topic. ×

4
Oligocene mammal of North America(expression, fauna, america)
4
Oligocene reptile of North America(expression, fauna, america)
2
Archaeotherium(noun, animal, america)
2
Arikareean(noun, animal, america)
2
Geringian(noun, animal, america)
2
Hoplophoneus(noun, animal, america)
2
Ischyromys(noun, animal, america)
2
Metamynodon(noun, animal, america)
2
Orellan(noun, animal, america)
2
Whitneyan(noun, animal, america)
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APASmart Define. (1970). oligocene animal of north america thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/oligocene_animal_of_north_america/thesaurus/narrower
ChicagoSmart Define. 1970. "oligocene animal of north america thesaurus" https://smartdefine.org/oligocene_animal_of_north_america/thesaurus/narrower (accessed October 2, 2026).
HarvardSmart Define 1970, oligocene animal of north america thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/oligocene_animal_of_north_america/thesaurus/narrower>.
MLASmart Define. "oligocene animal of north america thesaurus" 1 January 1970. Web. 2 October 2026. <https://smartdefine.org/oligocene_animal_of_north_america/thesaurus/narrower>