. Geological magazine. estone and Softer Beds near Thebes. are much shifted by faults, so that in places the newer membersof the series are brought down to the level of the middle the north, where the crystalline rocks terminate, the east andwest fractures become more pronounced. A very important oneseems to pass through the VVady Dugla, behind the Mokattam Hill,extending thence eastward toward the Red Sea. The north andsouth fractures have no doubt exercised an important influencein determining the position of the river valley, and their compaiativeabsence on the eastern side has
. Geological magazine. estone and Softer Beds near Thebes. are much shifted by faults, so that in places the newer membersof the series are brought down to the level of the middle the north, where the crystalline rocks terminate, the east andwest fractures become more pronounced. A very important oneseems to pass through the VVady Dugla, behind the Mokattam Hill,extending thence eastward toward the Red Sea. The north andsouth fractures have no doubt exercised an important influencein determining the position of the river valley, and their compaiativeabsence on the eastern side has tended to give greater continuityand elevation to the cliffs on that side as far up as Thebes. Clays, believed to belong to the lower part of the Eocene, appearbeneath the limestones at Thebes, and between El Kab and Silsilisthere are clays, marls, limestones and sandstones, which are saidto contain Cretaceous fossils, and these rest on the Nubian sandstoneto be noticed in the sequel. In the soft beds near Edfou, which. Fig. 3.—Cretaceous Sandstone and Marl above Silsilis. are probably Cretaceous, and above the Nubian sandstone, boringsmade for coal have ascertained the existence in clays and sandy 390 Prof. J. W. Daicson—Notes on the Geology of Egypt. beds of carbonized wood, striated leaves and stems resembling thoseof reeds. The Cretaceous formation does not, however, attain toso great a development in Egypt as in Syria, and this, I think,is an important point with reference to the attempts which havebeen made to correlate the rocks of the two regions. We shall bestunderstand their true relations by studying a section geographicallyintermediate, which we may find on the shores of the Red Sea, sixtymiles to the eastward of the great Mokattam section near Cairo. Tracing the Mokattam range to the eastward, in Jebel Attaka onthe Red Sea, it rises to a considerably greater elevation, and whileits upper part consists of Eocene Limestone with Nummulites ^ andother characteristi
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