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THE GEOLOGIST. 



The coast from Stonehaven to Aberdeen affords a most interesting exposure 

 of the structure of the Grampians. The Old Red Sandstone of Stonehaven 

 is succeeded by the clay-slate of Carron Point and that in turn by mica-slate 

 and gneiss, all of them frequently traversed by dykes of trap, porphyry, quartz, 

 and granite. This subject is noticed in Nicol's " Guide to the Geology of 

 Scotland," p. 180, &c, and in the Geological Society's Journal, vol. xi., p. 544. 



Stereognathus Ooliticus prom Stonesfield Slate. — Dear Sir, — I think 

 that most of your readers will be glad to hear of the discovery of a second 

 specimen of the hitherto unique jaw of the Stereognathus Ooliticus. Such a 

 specimen I lately had brought to me by a young friend among other fossils for 

 naming. On obtaining it from him, I showed it to my friend Professor Huxley, 

 who very kindly worked the specimen out from the enclosing matrix. At first 

 he believed it to be a new species altogether; but he tells me now, from 

 further examination and comparison with the only other known specimen that 

 he considers this also to be the Stereognathus Ooliticus. It should be re- 

 marked that my specimen has one more tooth than the original fossil, although 

 the crowns of the little molars are not in quite so perfect a state of preserva- 

 tion. There is about the same amount of the jaw-bone preserved, which is 

 clearly exposed, and in which the double fangs of the teeth (so characteristic 

 of the mammalian class) may be seen embedded. The locality from which my 

 specimen comes is rather uncertain ; but shells and other fossils which were 

 associated with it, and the appearance of the matrix itself prove it to be from 

 the Stonesfield Slate. — I remain, sir, yours &c, E. Ray, Lanbeater. 



Geology oe Arabia. — Sir, — Could you kindly inform me, through the 

 medium of your invaluable " Notes and Queries," what the principal geological 

 features of Arabia consist in; or refer me to any book, paper, or pamphlet 

 where I could find anything on the geology of that country ? Also whether the 

 deserts in the interior are of tertiary formation or not ? If you could answer 

 me these questions you would much oblige me. — Yours, &c, M. R. A., New- 

 port Pagnall. 



In the Journal of the Royal Geographical Society, vol. iv., p. 192, 1834, is 

 a paper on the Southern Coast of Arabia and the shores of the Red Sea, in 

 which geological observations are plentiful. 



The south-east coast of Arabia has been treated of geologically (bv Dr. H. 

 J. Carter), in the Journal of the Bombay Branch of the Asiatic Society, for 

 January, 1852. 



With respect to geological maps of Arabia, we may mention the " Geognos- 

 tische Karte des Petraischen Arabien (by J. Russegger, 1847, Schweizhart, 

 Stuttgart). 



The chief geological features in Arabia appear to consist of — 1, granitic and 

 metamorphic rocks (especially near the coast-line and in the Sinai district) ; 

 2, sandstone of undetermined age ; 3, cretaceous rocks of considerable extent ; 

 4, nummulitic and other tertiary strata in abundance ; 5, post-pliocene sands, 

 some of them rich in shells and foraminifera : some at least of the desert-sands 

 belong to the last. 



Geology of Yorkshire. — Dear Sir, — It is a regular custom for a few of 

 us in tills district, during the summer season, when we are favoured with a 

 week's recreation, to visit some district in search of its geological treasures. 

 We are this year anxious to visit the east-coast of Yorkshire, but more parti- 

 cularly Whitby and Scarborough; none of us, however, are acquainted with 

 the formation of that district, and from the books which we have we can obtain 

 very little information. 



If you or some of your learned correspondents could, through the medium 

 of your most valuable publication (which is taken by several, and read by 

 every member of our society), give us some information as to the rocks of the 



