Consideration of the vertical and areal distribution and composition of upper Cretaceous and lower Tertiary foraminiferal faunas in Egypt provides evidence of the tectonic control of biologic associations. The litho- and biofacies of the stable shelf areas marginal to the Arabo-Nubian massif reflect the effects of epeirogenic movements which produced widespread trasgressions and regressions, accompanied by continuous and progressive shifting of facies toward the new shoreline. In the mobile shelf zone, lying between the foreland and the Tethyan geosyncline to the north, the complex distributional pattern of rock units and faunal assemblages is related to changing configurations of the sea bottom produced by compressional folding and intermittent tensional faulting.

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