The Tunisian Atlas mountains are a fold and thrust belt between the Rifo-Tellian chain, in the northwest (a part of the Alpine chain) and the Saharan platform in southern Tunisia. The Rifo-Tellian chain is separated from the Atlas Mountains in northern Tunisia by the Tunisian Trough.[1] Sedimentary units in the Tunisian Atlas mountains are divided by three regional faults: the Kasserine Fault, Gafsa Fault and Kaala-Djerda-Sbiba Fault. [2]