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Avery Island salt dome

View on map:29.895276°N 91.903210°W

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The salt diapir had to rise nearly 40,000 feet to reach its present shallow location below the surface.  These salt domes are frequently associated with oil that is trapped by the impermeable salt and shale along its sides.  

Description


Avery Island, Louisiana

Avery Island is actually a huge dome of rock salt, three miles (5 km) long and two and a half miles (4 km) wide.[1] It was created by the upwelling of ancient evaporite (salt) deposits that exist beneath the Mississippi River Delta region. These upwellings are known as "salt domes." Avery Island is one of five salt dome islands that rise above the flat Louisiana Gulf coast.[6]

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