盐穹在过去干湿两季交替出现时期开始形成。

Salt domes start during past periods of alternating wet and dry climate.

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当许多盐穹挤压年轻的上覆岩层时，有可能原本在下方的盐质会逐渐挤压直至突出地表。

While many salt domes retain a cap of the youngest rock layers at the surface, in some cases the underlying salt extrudes all the way to the surface.

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例如，盐穹表现为负的重力异常，因为比起所有的固结沉积物，岩盐具有较低的密度。

For instance, salt domes appear as negative anomalies because rock salt is of a lower density than all consolidated sediments.

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