During the Lower Palaeozoic, the Saharan craton was part of the North-Western passive margin of Gondwana and was located close to the South Pole during the Cambrian and Ordovician (Stamplfi & Borel, 2002). A short-lived glaciation event occurred in the Latest Ordovician. The ice sheet covered a large part of North Africa and resulted in a major phase of glacial erosion. This glacial erosion formed the tunnel valleys that we see in the outcrops of the Tassili N’Ajjers today.


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