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12 entries under period topic. ×

6
Extant Eocene first appearance(expression, eocene, appearence)
6
Lutetian first appearance(expression, eocene, appearence)
6
Bartonian first appearance(expression, eocene, appearence)
6
Priabonian first appearance(expression, eocene, appearence)
6
Ypresian first appearance(expression, eocene, appearence)
4
Chattian first appearance(expression, appearance, oligocene)
4
Danian first appearance(expression, appearance, paleocene)
4
Extant Oligocene first appearance(expression, appearance, oligocene)
4
Extant Paleocene first appearance(expression, appearance, paleocene)
4
Rupelian first appearance(expression, appearance, oligocene)
4
Selandian first appearance(expression, appearance, paleocene)
4
Thanetian first appearance(expression, appearance, paleocene)
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APASmart Define. (1970). paleogene first appearance thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/paleogene_first_appearance/thesaurus/related
ChicagoSmart Define. 1970. "paleogene first appearance thesaurus" https://smartdefine.org/paleogene_first_appearance/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, paleogene first appearance thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/paleogene_first_appearance/thesaurus/related>.
MLASmart Define. "paleogene first appearance thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/paleogene_first_appearance/thesaurus/related>