SOÜRCE: Adapted from V.H. Heywood, R.T. Watson, and ünited Nations Environmental Programme, Global Biodiversity Assessment (Cambridge and New York: University of Cambridge Press, 1995), p. 879.
Table 4: Degree of extinction (%) in the five major mass extinctions in the fossil records
Mass Calculated Calculated extinction Observed species-level Observed species-level extinction extinction extinction extinction
1. End-Ordovician 439 Maii
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