[Footnote 40: A short account of the geological structure of Baharia has already been published:— BEADNELL, op. cit. (_Découvertes Géologiques Récentes_, etc.) Int. Geol. Cong. 1900; Paris, 1900.] [Footnote 41: This, with the 6 metres of Eocene limestone above, gives the height of the hill above the floor as 174 metres. Ascherson gives 162, but the difference is probably due to our readings being commenced on the lowest ground in the neighbourhood, where the oldest beds were exposed.] [Footnote 42: The specific names given in this report are based on determinations made by Dr. Blanckenhorn in Cairo and by Mr. Bullen Newton at the British Museum.] [Footnote 43: In connection with the discovery of Cenomanian deposits in Baharia Oasis, _vide_, _Geological Magazine_, Nos. 127, 430, 432, 1900 (H. J. L. B.).] [Footnote 44: A very striking feature of the brown limestones is the abundance in them of calcite-lined cavities; these are often arranged in planes parallel to the bedding, as is well seen for instance in the hills north-west of Harra.] [Footnote 45: Mr. Gorringe first drew attention to the presence of fossil wood in these beds.] [Footnote 46: An analysis of this bone-bed is given in _Report on the Phosphates of Egypt_, Geol. Surv. Egypt, publication, Cairo. 1900.] [Footnote 47: BEADNELL, _Dakhla Oasis, its Topography and Geology_. Geol. Surv. Egypt. Report, 1899, Pt. IV. Cairo. 1901, pp. 96-98.] [Footnote 48: BARRON and HUME, _Topography and Geology of the Eastern Desert of Egypt_, Geol. Surv. Report, Cairo, 1903.] [Footnote 49: It may perhaps be that the lowest limestone bed disappears, having thinned out, in which case it is difficult to distinguish the sandstones and clays of this division from those of the one below.] [Footnote 50: Zittel, _op. cit._] [Footnote 51: As it seems probable that the Lower Mokattam is a somewhat local development of the upper part of the Libyan Series, and it being difficult or impossible in many areas to separate the two, we shall in our description of the Eocene of this oasis make no attempt at a division.] [Footnote 52: CHAPMAN, _Geol. Mag._ Dec. IV, Vol. IX, Feb. and March, 1902, pp. 62-67, 106-114.] [Footnote 53: 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.”]