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11 entries under period topic. ×

11
cretaceous-paleogene boundary(expression, geohistory, extinction, boundary)
10
eocene extinction(expression, extinction, geochronology)
6
Paleocene extinction(expression, extinction, geochronology)
6
Paleogene genus extinction(expression, extinction, paleogene)
5
Paleogene species extinction(expression, extinction, paleogene)
3
Paleocene genus extinction(expression, extinction, geochronology)
2
Eocene genus extinction(expression, extinction, geochronology)
2
Oligocene genus extinction(expression, extinction, geochronology)
2
Paleocene species extinction(expression, extinction, geochronology)
2
Selandian extinction(expression, extinction, geochronology)
2
Thanetian extinction(expression, extinction, geochronology)
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APASmart Define. (1970). oligocene extinction thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/oligocene_extinction/thesaurus/related
ChicagoSmart Define. 1970. "oligocene extinction thesaurus" https://smartdefine.org/oligocene_extinction/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, oligocene extinction thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/oligocene_extinction/thesaurus/related>.
MLASmart Define. "oligocene extinction thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/oligocene_extinction/thesaurus/related>