I'm sure coal is as important in Glorantha as it was on our own world's history:
http://en.wikipedia.org/wiki/Charcoal
You are of course talking about fossilized coal. That has propably something to do with Lodril, and other underground fires. Parhaps it's a part of the explanation for volcanoes.
Interestingly enough one can often see imprints of prehistoric plants in coal. I wonder what that signifies on Glorantha. Parhaps the great forests of prehistory burned into charcoal and were buried underground in the cataclysms of the greater darkness.
-Adept
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