Note 53 — Chapter V

It should be noted here that the presence of an overlap was suspected by Capt. H. G. Lyons as long ago as 1894, as in his paper (op. cit. 535) he says:—

“At the north-east and east of the Baharia Oasis the Upper Mokattam beds, characterized by Ostrea Fraasi and O. Cloti (as kindly determined by Dr. Zittel), occur 30 miles north-east and 20 miles east of Upper Cretaceous beds containing Exogyra Overwegi in the oasis, and with a difference in altitude of less than 200 feet. As there is no marked dip of the beds, we have evidently an overlap of the remainder of the Cretaceous beds and the Libyan and Lower Mokattam beds of the Eocene, and this inference is borne out by the short distance between the Cretaceous and Miocene outcrops to the west on Dr. Zittel’s route to Siwa.”