re: Now Closed: I'll answer any question you have about ROCKS!

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Real question. How do salt domes form? Where did all that salt come from?

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The salt in salt domes comes from old salt deposits. For the Gulf of Mexico coast, our salt comes from long long ago in the Jurassic when the Gulf was just forming. It was very shallow and a lot of the water evaporated making it super salty. Over the years salt would be preserved in the rocks that make up the bedrock below the coast.

Salt is like a slow moving fluid under intense pressure...also add a little water and it becomes rather mobile. Salt domes form from salt squeezing out of places under high pressure and accumulating in a low pressure area.