At Site 546, below the Mazagan Escarpment at a water depth of 4km, 36m of salt rock was cored from the top of one of a field of salt domes. In contrast to those evaporites off the axis of Atlantic rifting, the salt at Site 546 may have been deposited in a very early central rift fed by marine waters from Tethys through the Gibraltar or South Atlas fracture zones.-from Authors