480 ON THE PLEISTOCENE SUCCESSION IN THE TKENT BASIN. 



work in the Midland districts was a most useful contribution towards 

 the correlation of the Drift-deposits of the British Islands. 



Prof. Blake congratulated the Author on the amount of work he 

 had done. He remarked on the difficulty of determining the dura- 

 tion of glacial flows. The Drift about Nottingham is very peculiar 

 and exhibits many varieties ; one form contains igneous rocks 

 largely, probably from Derbyshire and the west. Beneath are false- 

 bedded sandy beds ; above comes the Chalky Boulder-clay with 

 eastern rocks, Chalk, Oolite, and Lias, besides the volcanic rocks, 

 which may be remanie. Another bed is formed entirely of Car- 

 boniferous Limestone, beautifully striated. Besides these beds there 

 are the well- stratified coarse gravels. He had himself never been 

 able to understand the whole sequence. 



Rev. A. Irving inquired about the great range of Boulder-clay 

 south of I^^ottingham, where it is 70 feet thick, overlying Lias shales. 

 This Boulder-clay contained Charnwood-Porest rocks, and occasion- 

 ally Carboniferous Limestone, but was mainly reconstructed Lias. 



Dr. HiNDE pointed out that the distinctions between the different 

 Boulder-clays were unmistakable. He inquired about the evidence 

 of marine submergence, and noticed that in Bavaria immense fresh- 

 water beds, gravels of great thickness, had been formed in connexion 

 with glaciers. 



Mr. Teall was imperfectly acquainted with the district, but 

 could testify to the large amount of careful work done by Mr. 

 Deeley. " The appearance of the deposits was at first sight most 

 perplexing, but Mr. Deeley really appeared to have succeeded in 

 establishing a definite sequence. 



The AiTTHOR said that his results were not dissimilar to Prof. Blake's, 

 all of whose remarks supported the vi,ew8 mentioned in the paper. 

 He explained the dispersion of the Charnwood-Porest rocks alluded 

 to by Mr. Irving. The distribution of the Quartzose Sand could 

 only be explained by assigning to it a marine origin. Mollusca only 

 appear in the Chalky Gravel along the westerly watershed of the 

 Trent basin in Staff'ordshire and Cheshire. 



