8 PBOCEEDINGS OF THE GEOLOGICAL SOCIETY. 



boulders are wedged fast in the channel, and suspended over the 

 stream, which flows about 6 feet beneath them. The boulders could 

 not possibly have been carried down the existing gorge, and they 

 did not, the author belieyed, fall from above. He suggested that 

 they might have been carried down by the aid of ice, probably in 

 the glacial period, when the stream ran in a wider channel at a 

 higher level, and that the stream had since deepened its bed at least 

 6 feet below them. 



The following objects were exhibited : — 



Bock-specimens and Microscopic Sections, exhibited by Prof. 

 J. W. Judd, P.E-.S., in illustration of his paper. 



Platinotype Photographs of Views in various parts of England, 

 illustrating the features of the different Geological Formations, ex- 

 hibited by E. H. Tiddeman, Esq., E.G.S. 



I 



