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Fig. 1. — Map of Egypt, showing the distribution of the ' gravels 

 containing igneous rocks derived from the Red-Sea Bills. 



EXPLANATION 

 (Gs) = Gneiss. (Gn) = Gra 

 (A) = Andesitc. (Sch) = Sch 

 '':'•':'•':'■ Igneous Gravels. 



