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8 entries under period topic. ×

2
Bartonian extinction(expression, extinction, geochronology)
2
Eocene genus extinction(expression, extinction, geochronology)
2
Lutetian extinction(expression, extinction, geochronology)
2
Priabonian extinction(expression, extinction, geochronology)
2
cretaceous-paleogene boundary(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). ypresian extinction thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/ypresian_extinction/thesaurus/related
ChicagoSmart Define. 1970. "ypresian extinction thesaurus" https://smartdefine.org/ypresian_extinction/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, ypresian extinction thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/ypresian_extinction/thesaurus/related>.
MLASmart Define. "ypresian extinction thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/ypresian_extinction/thesaurus/related>