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45 entries under chattian topic. ×

3
Extant Chattian first appearance(expression, geohistory, geogistory, period, oligocene)
1
Acer smileyi(expression, creature, geohistory)
1
Archaeohippus(noun, creature, geohistory)
1
Balbaridae(noun, creature, geohistory)
1
Carcharocles angustidens(expression, creature, geohistory)
1
Cephalomyidae(noun, creature, geohistory)
1
Cynarctoides luskensis(expression, creature, geohistory)
1
Daeodon(noun, creature, geohistory)
1
Deinotheriidae(noun, creature, geohistory)
1
Desmostylus(noun, creature, geohistory)
1
Diceratherium(noun, creature, geohistory)
1
Diprotodontidae(noun, creature, geohistory)
1
Enaliarctos(noun, creature, geohistory)
1
Enhydrocyon basilatus(expression, creature, geohistory)
1
Eocardiidae(noun, creature, geohistory)
1
Eomysticetidae(noun, creature, geohistory)
1
Eporeodon(noun, creature, geohistory)
1
Gryposuchinae(noun, creature, geohistory)
1
Hemicyoninae(noun, creature, geohistory)
1
Hymenaea mexicana(expression, creature, geohistory)
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APASmart Define. (1970). oligocene first appearance thesaurus. Retrieved October 1, 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 1, 2026).
HarvardSmart Define 1970, oligocene first appearance thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/oligocene_first_appearance/thesaurus/related>.
MLASmart Define. "oligocene first appearance thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/oligocene_first_appearance/thesaurus/related>