Continental rifting commonly follows flood basalt volcanism. Rift graben lakes are formed from crustal stretching also known as rifting. Craters or depressions formed by tectonic rifting often provide such topological depressions. Finally, there is rifting at the crest of the domed crust and volcanism occurs. The tectonic setting was one of a rifting continental margin. It was separated from the mainland by tectonic rifting and coastal erosion. The eruption of continental flood basalts is often associated with continental rifting and breakup. Fault-block mountains often result from rifting, an indicator of extensional tectonics. Nevertheless, the era featured the dramatic rifting of the supercontinent Pangaea. They develop in response to tensional tectonics due to rifting of an existing island arc. These basins were rift basins formed by the rifting of Rodinia. Many continental flood basalt events coincide with continental rifting. Continental rifting, with associated subsidence, tends to produce such landlocked water bodies. The sediment accumulated during the rifting of Pangea in the Triassic age. The Masefau dike complex and talus breccias are remnants of this rifting.