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54 entries under geogistory topic. ×

3
Extant Chattian first appearance(expression, geohistory, period, oligocene)
3
Extant Rupelian first appearance(expression, geohistory, period, oligocene)
1
Acanthochitona(noun, creature, eocene)
1
Aeluroidea(noun, creature, eocene)
1
Albatross(noun, creature, eocene)
1
Alligator(noun, creature, eocene)
1
Ameiurus(noun, creature, eocene)
1
Aplodontiidae(noun, creature, eocene)
1
Buccella(noun, creature, eocene)
1
Buteo(noun, creature, eocene)
1
Callochiton(noun, creature, eocene)
1
Certhioidea(noun, creature, eocene)
1
Chaetopleura(noun, creature, eocene)
1
Chamaesipho(noun, creature, eocene)
1
Colpophyllia(noun, creature, eocene)
1
Colubridae(noun, creature, eocene)
1
Cottidae(noun, creature, eocene)
1
Curassow(noun, creature, eocene)
1
Cyprinodontiformes(noun, creature, eocene)
1
Delphinoidea(noun, creature, eocene)
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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>