148 







■0}::C^^ 



Fig. 6. 

 Intercalations of loam and clay in Sand and Gravel, with Till. 

 Midland Railway, Throstle Hall cutting. 



Width, 6 feet. 



affected were pliant ; and when the disturbing cause ceased to act, 

 the resulting crumpled and contorted strata would naturally be 

 covered up by other strata undisturbed. Appended are illustra- 

 tions of these phenomena, taken from Cumberland drifts, where 

 they are due, I believe, to the irregular subsidence of the melting 

 ice sheet upon the pliant masses of sediment accumulating below it, 

 and giving rise to phenomena of the same nature as the "creeps" in 

 coal mines. By way of further illustration of the same phenomena, 

 I have here inserted, by permission of the Council of the Geologists' 

 Association, a figure illustrating a paper of mine on " The Super- 

 ficial Deposits of North Kent," published in the Proceedings of 

 that Association. In this case I feel sure that the contemporaneous 

 crumpling, shewn on various horizons, resulted from the disturbing 

 action of floating ice upon the Thames Valley deposits, at the 

 time when the Scandinavian Ice-Sheet had extended so far south 



