38 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [DcC. 9, 



but probably prse-Cretaceous, and the newer contemporaneous with 

 the flint-conglomerate. 



Notes on some Specimens of Nummulitic Eocks from Aeabia and 

 Egypt. By Prof. Eupeet Jones, F.G.S. 



Mr. H. Batjeeman having requested me to examine a series of typical 

 specimens of the Nummulitic rocks brought bj him from the East, I 

 append the following remarks on eight specimens, including a Stron- 

 tian crystal, containing some Nummulites and other organisms, from 

 near Cairo. 



Specimen No, 1. '' S. of Wady Gharandel, 7 April, 1868." (Greyish 

 brown asphaltic ISTummulitic limestone, weathering white.) Mainly 

 composed of Nummulina Ghyzensis *, large and small, with N. cur- 

 visjyira and N. Uamondi. Serpula present. 



No. 2. " Asphalt rock, S. of Wady Gharandel, 7 April." Like No. 1, 

 but browner. Contains N. Ghyzensis (large and small), pieces of Con- 

 chifera, and small fragments of Echinodelrms. Serpula also is present. 



No. 3. " Asphalt Rock, S. of Wady Gharandel, 7 April." Light- 

 brown rock (weathering white), in which Nummulina Ghyzensis is 

 abundantly visible throughout, together with Serjpulce and some frag- 

 ments of Echinoderms. 



No. 4. " Asphalt Eock, S. of Wady Gharandel, 7 April." A 

 piece of thin-bedded (|-inch) light-brown limestone, weathering 

 grey on the planes of bedding, and there showing its granular 

 structure and the organic fragments of which it is mainly composed.. 

 On one face is a small Ostrea, with Nummidina Ramondi. N. interme- 

 dia and pieces of Pecten(^) and of Echinoderms are seen in the mass. 



No. 5. ''Avsphalt Eock, near Gharandel, 7 April." No definite 

 organic remains are visible in this brown rock. It has the darkest 

 colour of all the specimens. By treatment with acid, it is found to 

 contain 90 per cent, of carbonate of lime and 10 per cent, of carbo- 

 naceous matter, which remains as a brown powder, easily inflamed, 

 burning with a bituminous odour. This substance is in sufficient 

 quantity to colour the limestone, and to give it when warmed by the 

 hand a bituminous smell ; but it is not dissolved out of the rock in any 

 appreciable quantity by boiling in turpentine -spirit or in petroleum. 



No. 6. " Lowest rock seen just beyond Pharaoh's Eall, 7 April." 

 A limestone altered by the agency of mineral springs, showing hollow 

 casts and remnants of Nummulina Ramondi and Opercidina canali- 

 fera (?). 



No. 7. " Nummulitic Limestone-gravel of Wady Gharandel, 16 

 June." Bluish -grey limestone full of N. Ramondi. Subangular, 

 polished by sand-action. 



No. 8. A Strontian crystal, from near Cairo, containing Num- 

 mulina Ramondi, and a Polyzoon comparable with Eschara Thomp- 

 soni, D'Archiac & J. H. * Eoss. de I'lnde,' pi. 36, f. 2. 



* In writing of NummuUtes Ghyzensis (Foss. de I'lnde, 1853, p. 95), D'Archiac 

 states, "As yet N. Ghyzensis is peculiar to Egypt. It abounds especially in 

 the Arabian range, in that of Mokattam to the East of Cairo, and on the lower 

 slopes of the mount Sinai massif, where it is associated with N. Eaviondi, whilst 

 in the Desert west of Cairo it is accompanied by N. Lucasana, var. j8," 



