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Avery Island is a salt dome, the largest of five along the Louisiana coast. Salt springs attracted animals and men to this high area in the marsh, and a massive salt deposit was discovered in 1862. The annual production is currently 2.5 million tons of 98.9% pure halite, the mines are depicted at lower right.

All images copyright © 2014 F.W. Vollmer and may not be used without permission.