{p. 39}

And we are not without evidences that the drift-deposits are found in
Africa. We know that they extend in Europe to the Mediterranean. The
"Journal of the Geographical Society" (British) has a paper by George
Man, F. G. S., on the geology of Morocco, in which he says:

"Glacial moraines may be seen on this range nearly eight thousand
feet above the sea, forming gigantic ridges and mounds of porphyritic
blocks, in some places damming up the ravines, and at the foot of
Atlas are enormous mounds of bowlders."

These mounds oftentimes rise two thousand feet above the level of the
plain, and, according to Mr. Man, were produced by glaciers.

We shall see, hereafter, that the sands bordering Egypt belong to the
Drift age. The diamond-bearing gravels of South Africa extend to
within twenty-two degrees of the equator.

It is even a question whether that great desolate land, the Desert of
Sahara, covering a third of the Continent of Africa, is not the
direct result of this signal catastrophe. Henry W. Haynes tells us
that drift-deposits are found in the Desert of Sahara, and that--

"In the _bottoms_ of the dry ravines, or wadys, which pierce the
hills that bound the valley of the Nile, I have found numerous
specimens of flint axes of the type of St. Acheul, which have been
adjudged to be true palæolithic implements by some of the most
eminent cultivators of prehistoric science."[1]