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9 entries under period topic. ×

8
Chattian first appearance(expression, geohistory, appearance, oligocene)
8
Rupelian first appearance(expression, geohistory, appearance, oligocene)
7
paleogene first appearance(expression, appearance, oligocene)
5
Extant Lutetian first appearance(expression, geohistory, eocene)
5
Extant Ypresian first appearance(expression, geohistory, eocene)
4
paleocene first appearance(expression, geohistory, oligocene)
1
Extant Eocene first appearance(expression, geohistory, appearance)
1
Extant Paleocene first appearance(expression, geohistory, appearance)
1
eocene first appearance(expression, geohistory, appearance, oligocene)
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APASmart Define. (1970). extant oligocene first appearance thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related
ChicagoSmart Define. 1970. "extant oligocene first appearance thesaurus" https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, extant oligocene first appearance thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related>.
MLASmart Define. "extant oligocene first appearance thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/extant_oligocene_first_appearance/thesaurus/related>