Notes and Comments. 



SHAP GRANITE BOULDERS. 



411 



Perhaps no rock has been so useful to geologists studying 

 .glacial phenomena in the North of England, as has Shap Granite. 

 Partly from the ready way in which it can be identified, but 

 principally from the fact that boulders of it have been scattered 

 Jike seeds in various parts of the country, and in enormous 

 juimbers, it has proved most serviceable in tracing the courses 



Boulder of Shap Qranite from Royston. 



•of the various ice streams that at one time existed in England. 

 The trails of the Shap granite boulders alone have demonstrated 

 certain unexpected routes of some of the old glaciers. We are 

 hoping shortly in these pages to print some interesting details 

 on this point. In the meantime we are able to give a represen- 

 tation of a boulder of Shap granite, weighing about 30 cwts. , 

 which was found at Royston, and is now in the Barnsley Park. 

 The illustration has been lent by the Yorkshire Geological 



jyofi December i. 



