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7 entries under period topic. ×

4
Chattian extinction(expression, extinction, geochronology)
4
Oligocene genus extinction(expression, extinction, geochronology)
2
cretaceous-paleogene boundary(expression, extinction, geochronology)
2
eocene extinction(expression, extinction, geochronology)
2
paleocene extinction(expression, extinction, geochronology)
2
paleogene extinction(expression, extinction, geochronology)
2
paleogene genus extinction(expression, extinction, geochronology)
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APASmart Define. (1970). rupelian extinction thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/rupelian_extinction/thesaurus/related
ChicagoSmart Define. 1970. "rupelian extinction thesaurus" https://smartdefine.org/rupelian_extinction/thesaurus/related (accessed October 2, 2026).
HarvardSmart Define 1970, rupelian extinction thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/rupelian_extinction/thesaurus/related>.
MLASmart Define. "rupelian extinction thesaurus" 1 January 1970. Web. 2 October 2026. <https://smartdefine.org/rupelian_extinction/thesaurus/related>