The Adelaide Rift Complex is a large geological feature that is found along the eastern border of South Australia, spanning from the Lofty Rangers down to the city of Adelaide. The Adelaide Rift Complex formed during the breakup of Rodinia. It is a sedimentary basin that was formed over 300 million years ago during the Neoproterozoic and Cambrian eras. The Adelaide Rift Complex is a collection of over 100 smaller formations. Its formation was influenced by salt tectonics and land deformation. The Adelaide Rift Complex includes the Flinders Ranges and the Mount Lofty Ranges.