The High Atlas Trough was formed during the early rifting of Africa and North America. Sedimentologic evidence indicates that subsidence of the trough was not accompanied by intense crustal deformation. The trough was a site of active sedimentation from Lower (Liassic) to Middle (Dogger) Jurassic time, and it contains a sequence of predominantly carbonate sedimentary rocks that do not indicate extensive syntectonic activity. The numerous tectonic features (that is, faulting and folding) associated with the Jurassic sedimentary rocks of this area today probably developed at a later, post-Jurassic date.

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