New ICS International Chronostratigraphy Chart Uses the Long Norian

The base of the Norian stage is set at ~228 Ma on the new chronstratigraphy chart of the International Commission on Stratigraphy.  Still needs further support and eventially a golden spike, but this is the first time the ICS has used the long Norian hypothesis on its published chart.

You can download the latest timescale from here:

http://www.stratigraphy.org/ics%20chart/ChronostratChart2012.pdf