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thanetian first appearance(noun, animal, geohistory, appearance)
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APASmart Define. (1970). Pelagornithidae thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/pelagornithidae/thesaurus/broader
ChicagoSmart Define. 1970. "Pelagornithidae thesaurus" https://smartdefine.org/pelagornithidae/thesaurus/broader (accessed September 23, 2026).
HarvardSmart Define 1970, Pelagornithidae thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/pelagornithidae/thesaurus/broader>.
MLASmart Define. "Pelagornithidae thesaurus" 1 January 1970. Web. 23 September 2026. <https://smartdefine.org/pelagornithidae/thesaurus/broader>