8o THE GLACIAL PHENOMENA OF THE COUNTRY 



observed, all upon Coal Measures sandstone, and preserved 



from weathering by a capping of drift.* 



Direction 

 Place Lat. and Long. of Stri^. 



Kenton Quarry ... 55° i' 10" 1° 39' 30" S.S.E. to S.E. 

 BruntonQuarry... S5°2'i." x° 37' 45" {Xo^^^H ruMdiary. 

 Burradon Quarry 55° 3' 5" i° 34' lo" 28°S. ofE. 



BurradonOld ... (44° S. of E.) j^^^^^^f^,^ 



5. of E. >• 



Quarry ... 55° 2' 55" 1° 33' 55" ■^20°S. ofE.^ oldestto 



(56°N. ofE.) most recent. 



From these data it would appear that the general move- 

 ment of the ice-sheet which produced the striations was to the 

 south-east, though, of course, we have no means of finding 

 out at what stage in the Glacial Period they were made. 



II. — Roches Moutonnees. 



Owing to the yielding nature of the rocks which crop out 

 in this area, well smoothed and rounded rock surfaces are 

 seldom met with. The best examples known to me are on 

 Shafthoe Crags, where large patches of gritty sandstone show 

 the characteristic appearance, although the groovings and 

 striations which must have accompanied it have long since 

 been obliterated by weathering. 



At Killingworth, a scarped face of highly-dipping sand- 

 stone, free from drift, gives undoubted evidence of planing by 

 ice-action. This is shown still more clearly at Kenton Quarry, 

 where, thanks to a protective covering of boulder clay, the 

 original ice-worn surface has been excellently preserved. The 

 "post" there dips at 10° S.E., and the N.-S. section showed, 

 a short while ago, a clean-cut convex curve at the scarped 

 end, instead of the notched outline which would result from 

 sub-aerial denudation. The surface of the rock under the 

 clay was striated, and the clay itself charged with scratched 

 boulders. The ice must have moved in the main from north 

 to south to produce the effect, and this direction agrees with 

 that of the striations given in the above table. 



* See Report of Boulders' Committee, Univ. Dur. Phil. Soc, vol. ii., p. 271. 



