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I used a simplification. Wikipedia has a bit more detail: https://en.wikipedia.org/wiki/Carboniferous#Rocks_and_coal https://en.wikipedia.org/wiki/Carboniferou

by DanBC 6y ago

I used a simplification. Wikipedia has a bit more detail: https://en.wikipedia.org/wiki/Carboniferous#Rocks_and_coal https://en.wikipedia.org/wiki/Carboniferous#Rocks_and_coal