The Westphalian (middle Carboniferous) strata of the Colomb-Bechar-Kenadza and Guir basins in southern Oran, Algeria, are lagoon deposits formed in continental or marginal paralic basins in which there were frequent marine invasions from the north until middle Westphalian time. The strata were not subjected to Hercynian (Paleozoic) crustal movements until after the lower Stephanian (upper Carboniferous), at which time extensive anticlines were formed, some of which were further dislocated during Tertiary tectonic activity.

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