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In evolution theory, the Cambrian explosion, or less commonly Cambrian radiation, wis the relatively short evolutionary event, beginnin aroond 542 million years aby in the Cambrian Period, during which maist major animal phyla appeared, as indicatit bi the fossil record.[1][2]

ReferencesEedit

  1. Maloof, A. C.; Porter, S. M.; Moore, J. L.; Dudas, F. O.; Bowring, S. A.; Higgins, J. A.; Fike, D. A.; Eddy, M. P. (2010). "The earliest Cambrian record of animals and ocean geochemical change". Geological Society of America Bulletin. 122 (11–12): 1731–1774. Bibcode:2010GSAB..122.1731M. doi:10.1130/B30346.1. 
  2. "New Timeline for Appearances of Skeletal Animals in Fossil Record Developed by UCSB Researchers". The Regents of the University of California. 10 November 2010. Retrieved 1 September 2014.