Two small Suggarian (Precambrian) massifs, one in the northern Ahaggar mountains, Algeria, southwest of the Tihodaiene Erg and the other in the extreme southern part of the range east of Tin Zaouatene, exhibit similar characteristics. Both occur within Pharusian (Precambrian) basins, and the rocks are characterized by a facies resembling that of rocks of the distant In Ouzzal horst. Analysis of the mechanism responsible for development of this facies may throw light on the genesis of the rocks and on charnockitic facies in general.

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