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Necking

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East Africa's Rift Nears Continental Split as Crust Thinness Advances
science1 month ago

East Africa's Rift Nears Continental Split as Crust Thinness Advances

Scientists report that the Turkana Rift beneath East Africa has thinned to a critical point, a stage called necking that signals the continent is gradually breaking apart and could eventually form a new ocean. Center rift crust is about 13 kilometers thick, with surrounding areas over 35 kilometers, and the thinning indicates continued rifting on a timescale of millions of years. This tectonic activity also helps explain why the region preserves an unusually rich fossil record of human evolution, as subsidence and sedimentation favored fossil preservation.