Gulf of Mexico Salt Structures

Sea-bottom topography of the Louisiana slope, Gulf of Mexico. The complex topography has been influenced by salt migration. Darker blues represent deeper areas; lighter blues represent shallower areas. The crater-like features represent areas of salt withdrawal and subsidence. The ridge-like features, cut by normal faults, represent areas into which salt has risen. Image [provided by F.A. Diegel and N.T. Immega (Shell Oil)] appear on the cover of AAPG Memoir 65, "Salt Tectonics: A Global Perspective" edited by M.P.A. Jackson, D.G. Roberts, and S. Snelson.