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It's candle wax. I can't find the reference, but I remember reading that the "shelves" were used as an elevated place for candles by early explorers who noticed the airflow. Also explains the "fluid dynamics" and narrow flow down the wall.
Edited 2 time(s). Last edit at 15-Aug-17 23:56 by Apap.
Edited 2 time(s). Last edit at 15-Aug-17 23:56 by Apap.
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