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271 entries under geohistory topic. ×

1
Omomyidae(noun, creature, paleocene)
1
Oreodontoides(noun, creature, chattian)
1
Orohippus(noun, creature, eocene)
1
Oromerycidae(noun, creature, eocene)
1
Osbornodon(noun, creature, rupelian)
1
Osbornodon iamonensis(expression, creature, rupelian)
1
Oxyaena(noun, creature, paleocene)
1
Oxydactylus(noun, creature, chattian)
1
Pagrus(noun, creature, eocene)
1
Pakicetidae(noun, creature, eocene)
1
Palaelodidae(noun, creature, rupelian)
1
Palaeoamasiidae(noun, creature, eocene)
1
Palaeocarpilius(noun, creature, eocene)
1
Palaeochiropterygidae(noun, creature, eocene)
1
Palaeogale(noun, creature, eocene)
1
Palaeomerycidae(noun, creature, eocene)
1
Palaeonictis(noun, creature, paleocene)
1
Palaeotheriidae(noun, creature, eocene)
1
Palorchestidae(noun, creature, chattian)
1
Pantodonta(noun, creature, paleocene)
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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>