244 KEPORT— 1882. 



intermixed with nnmeroas round and oval stones and pebbles, together with 

 small gravel, sand, and clay. In different parts of the section these 

 materials occur in varying proportions, a light clay generally pre- 

 dominating. The erratic blocks, however, so pervade the whole bed, 

 and so thoroughly constitute a component part of it, that tjjey cannot 

 have been dropped into it either singly or by twos and threes. They 

 must all have travelled together, for a certain distance at any rate, and 

 have been brought down together to the spot at which they are found. 

 They consist of — 



Fel sites. 



Felspathic ashes. 



Shales and flagstones. 



Quartz conglomerates. 



Fragments of quartzite. 



Millstone grits (with Stigmaria). 



Fossiliferous calcareous sandstones of Llandovery age. 



The felsites and the felspathic ashes are the most abundant, and the 

 Llandovery sandstones are the rarest. No granite has been found in 

 this gi'oup of erratics. 



The sizes of the blocks vary. The measurements of a few of the 

 largest are as follows : — 



20 in. X 20 in. x 8 in. ; 26 in. x 15 in. x 14 iu.; 28 in. X 29 in. 

 X 10 in. ; 32 in. x 18 in. x 16 in. 



Some are subangular ; a not inconsiderable proportion are well 

 smoothed, although they can hardly be said to be highly polished ; and 

 on a few striae may be traced. 



Professor C. Lapworth has examined the specimens, and recognises a 

 large number as being of rocks that occur m situ at the Berwyn Hills ; 

 others may be found in the Arenig range. 



The condition of the new red sandstone rock on which the boulders 

 rest is most remarkable. The sandstone rock is broken up ; and large 

 fragments of it have been lifted up out of their position and thrust into 

 the middle of the drift. At one point in the section a part of the rock 

 has been lifted up almost like an arm, and still remains united with the 

 basement mass, while the drift fills the V-shaped hollow. A lai-ge erratic 

 block is seen close to the extreme end of the uplifted arm of the basement 

 rock. 



The evidence of violence is complete. The breaking up of the sand- 

 stone rock, the uplifting of parts of it en masse, and the carrying away 

 of fragments, are facts as patent as the presence of the erratic blocks 

 themselves. 



The Secretary of the Committee has had photographs of the section 

 prepared, to be preserved with specimens of the erratic blocks found. 



The Rev. W. Tuckwell has called the attention of the Committee to 

 some very interesting boulders at Stockton, near Rugby, about equi- 

 distant from Leamington, Rugby, and Coventry. The dimensions of the 

 largest boulder are 4 ft. x 2 ft. 4 in. x 2 ft. 2 in. It is in part angular, 

 but some portions are rounded. One end is planed into two level 

 slabs. No distinct striations can be traced. The direction of its longest 

 axis is almost exactly N. and S. It is composed of granite from Mount 

 Sorrel, Leicestershire. It is quite isolated, and rests upon the lower 

 middle lias clay. Its height above the sea is 289 feet. Through the 



