1 66 



PROCEEDINGS COTTESWOLD CLUB 



1913 



sheet as a whole gradually retreated northward, and divided 

 into its component parts, which eventually disappeared. 

 Both in the latter stages of its advance and in the earlier 

 stages of its retreat its outward edge was always fringed by 

 long ice lobes or finger-like glaciers extending far down the 

 deeper valleys. 



A'.l THE LARGE BOUUOERS m THIS MRK WERt PBOBABLY BBOUCHTHME «Y 



■'•f. r.r SHEFTj ino ctAcitHs of the great ice ace. from tme 



- _»-'iZ'^'C. WOUNTAiMS OF M09TH WALES. 



-4 > 



\t \ Cl'ACiBa, 





\ vC^GLAC'iSa 





Fig. I. — From the Indicator in the Cotteridge Park, showing how this country was 

 afiected by Glaciers in the Ice-Age, their extent, and the chief lines of flow. Note the 

 southern limit of the ice-sheet. 



It is, of course, somewhat difficult to picture the actual 

 form of the upper surface of the great Ice-Sheet when at its 

 maximum, but that surface probably sloped gently from north 

 to south (somewhat hke the surface of a gently inclined plane) 

 down to its southern extremity. The ice-mass was so thick 

 that in Scotland it apparently buried from sight the great 

 ranges of the Sidlaws and the Pentlands. It filled the Irish 

 Sea and the German Ocean to overflowing, and moved thence 

 south-eastwards and south-westwards over the plains and 

 solid lands. 



There is evidence to show that the surface of the ice 

 overtopped hills in Scotland 1,800 feet high, in Shropshire 



