Description

The frequency of mass extinctions in the fossil record.

Format

A data frame with 21 observations on the following 2 variables.

num.extinctions

a numeric vector

count

a numeric vector

Source

Raup, D.M. and J.J. Sepkoski, Jr. 1982. Mass extinctions in the marine fossil record. Science 215: 1501-1503.

References

http://www.sciencemag.org/cgi/content/abstract/sci;215/4539/1501

Examples