A New Period for the Geologic Time Scale

@article{Knoll2004ANP,
  title={A New Period for the Geologic Time Scale},
  author={Andrew H. Knoll and Malcolm R. Walter and Guy M. Narbonne and Nicholas Christie‐Blick},
  journal={Science},
  year={2004},
  volume={305},
  pages={621 - 622}
}
The geologic time scale is in need of an update, given that the last modification took place in 1891. In their Perspective, [Knoll and colleagues][1] announce the proud addition of a new interval to the geologic time scale, the Ediacaran Period, by the International Union of Geological Sciences. [1]: http://www.sciencemag.org/cgi/content/full/305/5684/621 
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