Mr Hugh Miller on Boulder-Glaciation. 167 



The figure (Fig. 2) represents part of a fine group of glaciated 



Fig. 2. 

 Pavement-boulders in Till on the fore-shore, Northumberland. 



boulders sticking in clay upon the Northumbrian coast. A 

 group somewhat similar, showing all the features of boulder- 

 glaciation, can be seen at half tide upon the shore towards 

 the west side of Granton Harbour. West of the Custom 

 House I counted forty-two of them. The angle of the 

 abraded slope varies, so far as I have observed, between 

 7 and 25 or 30 degrees. The longer axis of the stone is 

 often directed in the line of glaciation, and the pointed end 

 is frequently, but by no means always, (see Fig. 4,) towards 

 the ice. 



The Strice, 



In the largest size of boulder, the depth and firmness of 

 the strise differs in no degree from the groovings on solid 

 rock. In the boulder represented in Fig. 3 — a fine boulder of 

 Corstorphine greenstone, about 6 feet long, recently uncovered 

 beside Eothesay Terrace — the scoring was as deep and the 

 polishing as fine as in the best rock glaciation, the largest 

 scores being half-an-inch broad by one-eighth of an inch 

 deep. The strise in this case, which may be taken as typical, 

 were confined to the top and upper flanks of the stone. As 

 I saw it, it stood about 2 J feet high upon the cushion of 



