For agriculture or for gunpowder manufacturing? Because I would say fairly late in both cases. Large-scale quano mining for fertilizer didn’t start until the 19th century.
At what stage of Westeros’ technological/agricultural development would guano mining become a major industry and could this drastically change the economy of the Iron Islands? Is there a chance for this have occured (and have been succesful) in some AU? Canon evidence is given to the abundence of fish as well as the numerous rocky isles/outcrops of Ironmans Bay, perfect nesting grounds for birds…
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