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7 entries under period topic. ×

7
Oligocene genus extinction(expression, extinction, geochronology)
7
Rupelian extinction(expression, extinction, geochronology)
3
cretaceous-paleogene boundary(expression, extinction, geochronology)
3
eocene extinction(expression, extinction, geochronology)
3
paleocene extinction(expression, extinction, geochronology)
3
paleogene extinction(expression, extinction, geochronology)
3
paleogene genus extinction(expression, extinction, geochronology)
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APASmart Define. (1970). chattian extinction thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/chattian_extinction/thesaurus/related
ChicagoSmart Define. 1970. "chattian extinction thesaurus" https://smartdefine.org/chattian_extinction/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, chattian extinction thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/chattian_extinction/thesaurus/related>.
MLASmart Define. "chattian extinction thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/chattian_extinction/thesaurus/related>