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IX. Proceedings of Learned Societies. 



GEOLOGICAL SOCIETY. 



[Continued from vol. xxi. p. 514.] 



May 12, 1886.— Prof. J. W. Judd, F.E.S., President, in the Chair. 



THE following communications were read : — 

 1. " On the Maxilla of Iguanodon" By J. W. Hulke, Esq., 

 F.B.S., F.G.S. 



2. " Notes on the Distribution of the Ostracoda of the Carboni- 

 ferous Formations of the British Isles." By Prof. T. Rupert Jones, 

 F.E.S., F.G.S., and J. W. Kirkby, Esq. 



3. " Note on some Yertebrata of the Eed Crag." By E. Lydekker, 

 Esq., F.G.S. 



4. " The Pleistocene Succession in the Trent Basin." By E. M. 

 Deeley, Esq., F.G.S. 



The author, after referring to previous publications on the subject, 

 proceeded to notice the leading characters of the greatly developed 

 Pleistocene deposits in the area drained by the Trent river and its 

 tributaries. He proposed to classify the beds in question under 

 three divisions, comprising the following stages. The beds of the 

 lowest division were distinguished from those of the middle and 

 upper by the absence of Cretaceous rock-debris. 



Older Pleistocene. 



Early Pennine Boulder-clay. 



Quartzose Sand. 



Middle Pennine Boulder-clay. 



Middle Pleistocene. 

 Melton Sand. 



Great Chalky Boulder-clay. 

 Chalky Sand and Gravel. 



Newer Pleistocene. 



Interglacial Eiver- alluvium. 

 Later Pennine Boulder-clay. 



Each of the separate stages was then described separately, with 

 details of exposures and sections throughout the area. 



The Early and Middle Pennine Boulder- clays, which closely re- 

 sembled each other, were regarded as composed of materials derived 

 almost entirely from the Derbyshire mountains, but with a slight 

 admixture, to the westward, of erratics derived from Scotland and 

 Cumberland. The latter were probably brought from those localities 

 by an ice-stream, the main materials of the deposits having been 

 transported from the Pennine chain by glaciers, and deposited in the 

 partially submerged valley of the Trent. The intermediate quartzose 

 sand was deposited in the sea during an intercalated warmer age of 

 considerable submergence. 



The Middle Pleistocene deposits, distinguished from the earlier by 

 containing large quantities of chalk and flints derived from the north- 



