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cretaceous-paleogene boundary(noun, eocene, extinction)
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paleogene extinction(noun, eocene, extinction)
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APASmart Define. (-0001). ptilodontoidea thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/ptilodontoidea/thesaurus/related
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MLASmart Define. "ptilodontoidea thesaurus" 30 November -0001. Web. 1 October 2026. <https://smartdefine.org/ptilodontoidea/thesaurus/related>