Abstract
A profile taken across the aeromagnetic coverage of Foul Bay and the adjacent north Benas Bay indicates seafloor spreading. The best synthetic-to-observed profile fit was for spreading to have occurred, along NNE axis, between 22 and 5 Ma ago at a rate of 0.5 cm/yr. In this interval extensive basic volcanicity was occurring in eastern Egypt. A nearly continuous spreading phase for this span of time, in a direction parallel to the present-day spreading axis, is suggested. It is postulated that spreading may have taken place under the evaporite cover, at which time coarse-grained Miocene and younger sediments were accumulated. This hypothesis may be supported by borehole data in Foul Bay. Magnetization values calculated for model blocks, of thicknesses comparable to that of layer 2, is found as approximately equal to that of the Brunhes epoch in the axial trough.
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