588 MR. F. CHAPMAN ON THE CONSOLIDATED [Aug. 10,00,. 



of formation of the rocks from India just described, and seems to be 

 in some respects a parallel case. 



In cod eluding these notes I may briefly refer to the foraminiferal 

 wind-borne sands of Dog's Bay (Galway), which Dr. Evans has 

 already mentioned. These sands are an almost pure foraminiferal 

 deposit, and consist largely of sub-globular MiUolince and the inflated 

 Truncatulina lobatuld. As in the case of the foraminifera of the 

 Kathiawar rocks, where the genera are of the Milioline or the 

 Rotaline types, the deposits at Dog's Bay are composed of those 

 forms which are very susceptible of movement by the slightest 

 breeze that blows upon them, and causes them to creep along in the 

 direction of the wind. 



EXPLANATION OF PLATE XXXII. 



Fig. 1. Microscope-section of cavernous semicrystalline limestone from Chorwar 

 Eoad. X 36. 

 2. Microscope-section of calcareous rock from Porbandar. X 30. 



Discussion on the two foregoing papers. 



Prof. Hull thought Dr. Evans's paper very suggestive ; but he was- 

 unable to accept his views, unless to a very limited extent. As 

 regards the oolitic limestones on the coast of the Red Sea and along 

 the Sinaitic peninsula, described by Prof. Walther, he had not had 

 an opportunity of personally examining them, but he had understood 

 that they were distinctly coralline raised-beaches. It was un- 

 questionable that the whole of that region had been elevated from 

 below the waters of the sea in late Pliocene times as shown, among 

 other cases, by the raised beach of Jebel Mokattam above Cairo 

 (first described by Dr. Oscar Fraas) at a level of 220 feet above the 

 surface of the Red Sea. With regard to the suggestion of Dr. Evans 

 that some of the Oolite-limestones of England, characterized by 

 oblique lamination, were of acolian origin, he (the speaker) thought 

 that possibly some of the lower beds of the Great Oolite on the 

 horizon of the Stonesfield Slate might have been moved by winds 

 when left dry during the recession of the tides, as these were 

 doubtless shallow-water deposits ; and, finally, he desired to point 

 out that absence of marine shells or fossils from certain strata by 

 no means indicated that these strata were not of marine origin, as 

 the calcareous matter of which they are formed is liable to be 

 dissolved away by subaerial waters. 



The Rev. J. F. Blake said he was gratified that Dr. Evans had 

 been able to adopt the view of the seolian origin of the Porbandar 

 and Junagarh limestones. He was not sure of the necessity of the 

 sea being nearer at hand during the formation of the latter. If the 

 intervening land was covered with the usual fine alluvial soil, the 

 wind might have a selective action, blowing away the finer dust 

 while it deposited the coarser shell-grains against the hill-side. 

 He had not been able to recognize among the Jurassic rocks of 



