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13 entries under period topic. ×

7
paleocene extinction(expression, extinction, geochronology)
6
cretaceous-paleogene boundary(expression, extinction, paleogene)
6
oligocene extinction(expression, extinction, paleogene)
5
eocene extinction(expression, extinction, paleogene)
2
Paleogene species extinction(expression, extinction, paleogene)
1
Bartonian extinction(expression, extinction, geochronology)
1
Chattian extinction(expression, extinction, geochronology)
1
Eocene genus extinction(expression, extinction, geochronology)
1
Lutetian extinction(expression, extinction, geochronology)
1
Oligocene genus extinction(expression, extinction, geochronology)
1
Priabonian extinction(expression, extinction, geochronology)
1
Rupelian extinction(expression, extinction, geochronology)
1
Ypresian extinction(expression, extinction, geochronology)
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APASmart Define. (1970). paleogene genus extinction thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/paleogene_genus_extinction/thesaurus/related
ChicagoSmart Define. 1970. "paleogene genus extinction thesaurus" https://smartdefine.org/paleogene_genus_extinction/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, paleogene genus extinction thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/paleogene_genus_extinction/thesaurus/related>.
MLASmart Define. "paleogene genus extinction thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/paleogene_genus_extinction/thesaurus/related>