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271 entries under geohistory topic. ×

1
Mesotheriidae(noun, creature, eocene)
1
Miacidae(noun, creature, paleocene)
1
Miohippus(noun, creature, eocene)
1
Mixodectidae(noun, creature, paleocene)
1
Mylagaulidae(noun, creature, chattian)
1
Myophiomyidae(noun, creature, rupelian)
1
Nambaroo(noun, creature, chattian)
1
Nanotragulus(noun, creature, eocene)
1
Neoepiblemidae(noun, creature, chattian)
1
Nimravus(noun, creature, rupelian)
1
Notharctidae(noun, creature, eocene)
1
Notharctinae(noun, creature, eocene)
1
Nothokemas(noun, creature, chattian)
1
Notohippidae(noun, creature, eocene)
1
Notostylopidae(noun, creature, eocene)
1
Notoungulata(noun, creature, paleocene)
1
Numidotheriidae(noun, creature, paleocene)
1
Obdurodon(noun, creature, paleocene)
1
Oldfieldthomasiidae(noun, creature, paleocene)
1
Oligopithecidae(noun, creature, eocene)
For more, visit Oligocene_first_appearance on Power Thesaurus
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APASmart Define. (1970). oligocene first appearance thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/oligocene_first_appearance/thesaurus/related
ChicagoSmart Define. 1970. "oligocene first appearance thesaurus" https://smartdefine.org/oligocene_first_appearance/thesaurus/related (accessed October 2, 2026).
HarvardSmart Define 1970, oligocene first appearance thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/oligocene_first_appearance/thesaurus/related>.
MLASmart Define. "oligocene first appearance thesaurus" 1 January 1970. Web. 2 October 2026. <https://smartdefine.org/oligocene_first_appearance/thesaurus/related>