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9 entries under geochronology topic. ×

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