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Billy Springs Formation
The Billy Springs Formation is a salt-withdrawal minibasin. Salt-withdrawal basins are regions, found throughout the world, where salt and sediments subside due to the net lowering of the centre of mass (denser sediments move downwards and salt moves upwards). It is a late Ediacaran formation dominated by silty mudstones and was deposited in the Adelaide Rift Complex found in the Northern Flinders Ranges of South Australia. The formation, however, is only exposed in two regions; the Umbertana and Mount Freeling Synclines. Numerous salt diapirs (domes) are found in the Flinders Ranges (preserved as dolomitic Breccias).