Mass Extinction Frequency

The frequency of mass extinctions in the fossil record.

Usage

MassExtinctions

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

MassExtinctions
#>    num.extinctions count
#> 1                0     0
#> 2                1    13
#> 3                2    15
#> 4                3    16
#> 5                4     7
#> 6                5    10
#> 7                6     4
#> 8                7     2
#> 9                8     1
#> 10               9     2
#> 11              10     1
#> 12              11     1
#> 13              12     0
#> 14              13     0
#> 15              14     1
#> 16              15     0
#> 17              16     2
#> 18              17     0
#> 19              18     0
#> 20              19     0
#> 21              20     1