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
Showing posts with label long Norian. Show all posts
Showing posts with label long Norian. Show all posts
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