MassExtinctions | R Documentation |
The frequency of mass extinctions in the fossil record.
MassExtinctions
A data frame with 21 observations on the following 2 variables.
a numeric vector
a numeric vector
Raup, D.M. and J.J. Sepkoski, Jr. 1982. Mass extinctions in the marine fossil record. Science 215: 1501-1503.
http://www.sciencemag.org/cgi/content/abstract/sci;215/4539/1501
MassExtinctions
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