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Updated: May 8, 2025
The base of some of the dunes in the Delta of the Nile is reached by the river during the annual inundation, and the infiltration of the water, which contains lime, has converted the lower strata into a silicious limestone, or rather a calcarous sandstone, and thus afforded an opportunity of studying the structure of that rock in a locality where its origin and mode of aggregation and solidification are known.
The lowest bed of a calcarous sericitic schist is four feet thick and underlies a bed of schistose lime stone six feet in thickness, which is in turn covered by a finely laminated phyllite, ten feet thick. The whole is capped by thirty feet of quartzite, which forms the top of a long ridge.
The strain to which the rock has been subjected has resulted in a very fine lamination, and it is considerably weathered. 9 Calcarous Sericite Schist. Seven Miles East of Seal Lake. A dark compact rock, in which calcite and sericite predominate. Quartz is less plentiful. The results of shearing and pressure are very prominent and bring out the foliation, even in the calcite.
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