Returns the correct colour for a geological period. Currently requires expansion to work with all periods.
The colours use the World Geological Map (Paris) colours, the global standard used at by the international commission for stratigraphy.
The template should be updated to use the values stated at https://engineering.purdue.edu/Stratigraphy/charts/RGB.pdf. Please be careful not to leave any spaces in the rgb() declaration.
Will be seen like this in a wikitable or template.
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