What is the meaning of ordovician period?

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

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 28, 2026, from http://smartdefine.org/ordovician_period/definitions/1299280
ChicagoWordNet. 2010. "Ordovician period" http://smartdefine.org/ordovician_period/definitions/1299280 (accessed September 28, 2026).
HarvardWordNet 2010, Ordovician period, Smart Define, viewed 28 September, 2026, <http://smartdefine.org/ordovician_period/definitions/1299280>.
MLAWordNet. "Ordovician period" 23 October 2010. Web. 28 September 2026. <http://smartdefine.org/ordovician_period/definitions/1299280>