H. B. Newton — Fossils from Nubian Sandstone, Egypt. 355 



correlated with similar rock formations of Algeria, Sinai, Syria, Arabia, 

 and India (Bagh), and so be regarded as Middle Cretaceous or Ceno- 

 manian. Lartet found that no intrusions were observable from the 

 underlying igneous rocks. 



Bauerman ' determined the sandstones of Arabia Petroea as similar 

 to those of Egypt and Nubia, having older crystalline rocks below 

 and undoubted Cretaceous above. He thought such beds were of 

 Triassic age. 



Ralph Tate's' remarks On the Age of the Nubian Sandstone are 

 interesting, because a part of the formation in the Sinaitic region was 

 recognized as Carboniferous from the fossils that were found in the 

 associated limestones {Orthis 31ichelini, etc.), whilst the sandstone had 

 yielded impressions of Lepidodendron and Sigillaria. Tate, likewise, 

 referred to Unger's' determination of Dadoxxjlon ^gyptiacum ( = coni- 

 ferous) from the sandstone of Aswan and Um-Ombos of the Nile Valley, 

 which he regarded as contemporaneous in age with the Lepidodendron * 

 and Sigillaria ^ from the Sinaitic region. 



In remarking upon tlie Red Sandstone of Nubia, Coquand ^ called 

 attention to the discovery by Delanoue of Ostrea Verneuili of Leymerie, 

 in a boring called ' El-Aoui ' (since localized by Zittel as probably in 

 the Wadi Ouh, south-east of Edfu), through 94 metres of ' Grres 

 nubiens', which he considered proved the Garumnian age (= Upper 

 Cretaceous) of that formation. 



M. PomeP would not recognize the Garumnian age of the sandstone 

 advocated by Coquand. He regarded the sandstones of Central 

 Sahara as chiefly Devonian, of Sinai and Nubia (the true Nubian 

 Sandstone) as Carboniferous and extending into Abyssinia, Western 

 Guinea as probably Corallian, and of Palestine and Western Barbary as 

 Lower Cretaceous or about the horizon of the Neocomian or Gault. 



The Lihyschen Waste by Zittel® treats very fully of the Nubian 

 Sandstone. He places it in the Senonian group, and refers to 

 Mosasaurus (M. Mosensis) remains having been founcl by Pigari Bey at 

 a depth of 400 feet in a boring in the valley of Kena in ' Aschgrauen 

 Thon', similar to rocks occurring at Wadi Ouh, a large turtle carapace 

 being also discovered on the same occasion. 



The occurrence of Dadoxylon in Southern Egypt induced Dawson " 

 to regard the Nubian Sandstone of that area as Palaeozoic rather than 

 Mesozoic, although he was of opinion that both in Southern Egypt and 

 Sinai there was probably an Upper Palaeozoic Sandstone supporting 

 a not dissimilar sandstone of Lower Cretaceous age. Dawson also 

 noted, in a section between Kom Ombos and Aswan, the occurrence 

 of two distinct beds in the Nubian Sandstone, the upper consisting of 

 a ferruginous irregular sandstone, the lower being grey and laminated. 



1 Quart. Journ. Geol. Soc, 1869, vol. xxvii, pp. 17-38. 

 - Uuart. Journ. Geol. Soc, 1871, vol. xxvii, pp. 404-6. 

 3 Sitzungsb. Akad. Wiss. (Wien), 1859, vol. xxxiii, p. 228, pi. i, figs. 3-5. 



* Salter, Quart. Journ. Geol. Soc, 1868, vol. xxiv, p. 509. 



5 Holland, Quart. Journ. Geol. Soc, 1866, vol. xxii, p. 492. 

 « Bull. Soc. Geol. France, 1876, ser. in, vol. iv, pp. 159, 160. 

 ' Ibid., pp. 524-9. 



* Palcsontographiea , 1883, vol. xxx, pp. 59, 76, 77, 93. 

 9 Geol. Mag., 1884, pp. 391-3. 



