Showing "Ordovician period" (corrected from "Ordovician System (Period)") | add "Ordovician System (Period)" definition

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Ordovician
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APASmart Define. (2011). Ordovician period thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/ordovician_period/thesaurus/synonyms
ChicagoSmart Define. 2011. "Ordovician period thesaurus" https://smartdefine.org/ordovician_period/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2011, Ordovician period thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/ordovician_period/thesaurus/synonyms>.
MLASmart Define. "Ordovician period thesaurus" 26 April 2011. Web. 29 September 2026. <https://smartdefine.org/ordovician_period/thesaurus/synonyms>