| Top. | ||
| 1. | Well-bedded limestone and earthy chalk. | |
| 2. | Greenish and ash-grey shaly clays. | |
| 3. | Beds with Exogyra Overwegi. |
[38]On the Stratigraphy and Physiography of the Libyan Desert of Egypt, Quart. Jour. Geol. Soc., Nov. 1894, Vol. 50, p. 535.
[39]Letter from Prof. Zittel to Capt. Lyons, dated May 19th, 1894. It was afterwards suggested (Beadnell, op. cit. Int. Geol. Congress, p. 10) that these specimens were possibly not E. Overwegi at all, and Mr. Bullen Newton, of the British Museum, who has undertaken the determination of the Baharia collection, confirms this, stating that the so-called specimens of Exogyra Overwegi, referred to in Capt. Lyons’ paper, are in reality examples of E. mermeti.
[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.
[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.
[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.
[43]In connection with the discovery of Cenomanian deposits in Baharia Oasis, vide, Geological Magazine, Nos. 127, 430, 432, 1900 (H. J. L. B.).
[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.
[45]Mr. Gorringe first drew attention to the presence of fossil wood in these beds.
[46]An analysis of this bone-bed is given in Report on the Phosphates of Egypt, Geol. Surv. Egypt, publication, Cairo. 1900.