Published online by Cambridge University Press: 01 May 2009
A Sudden and great change takes place in the geology of the Nile valley in approaching the First Cataract, where we pass from the unaltered and nearly flat Nubian sandstones to rocks highly crystalline, greatly disturbed, and penetrated with multitudes of igneous veins.
page 440 note 1 In approaching the sandstone the strike of the schists changes to about N. 70° E.
page 441 note 1 Geol. Society of Germany, Jahrbueh, 1877. I have placed a suite of specimens in the hands of Prof. Bonney, F.R.S., who I hope may at some future time report on their precise lithological characters.