What is the meaning of ordovician period?

noun

  • From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds.
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APAWordNet. (2010). ordovician period. Retrieved September 29, 2026, from http://smartdefine.org/ordovician_period/definitions/1299280
ChicagoWordNet. 2010. "ordovician period" http://smartdefine.org/ordovician_period/definitions/1299280 (accessed September 29, 2026).
HarvardWordNet 2010, ordovician period, Smart Define, viewed 29 September, 2026, <http://smartdefine.org/ordovician_period/definitions/1299280>.
MLAWordNet. "ordovician period" 23 October 2010. Web. 29 September 2026. <http://smartdefine.org/ordovician_period/definitions/1299280>