THE GLACIAL GEOLOGY OF NORTHUMBERLAND 89 



system of dry valleys in the eastern half of the county is 

 described and their bearing upon the subject indicated. 

 Lastly, brief mention is made of the effects of the glaciation 

 on the drainage of the country. 



I . — The St nations. 



Two general directions of striation can be observed in 

 Northumberland, one from west to east, the other from north 

 to south. The former direction varies locally, becoming E.S.E. 

 in the valley of the North Tyne and E.N.E. in the country 

 between the Redewater and the Aln. Towards the coast the 

 direction swings to the S.E. and S., conforming to the trend 

 of the coast-line. The west-to-east series frequently bears no 

 relation to the surface features, crossing deep valleys and the 

 tops of lofty hills. Some of the greatest elevations striated in 

 this direction are the Wanny Crags 1050- ft., Callerhues Crag 

 1,100-ft., Darden Fell 1,150-ft., Harbottle Crag 1,135-ft, 

 Padon 1,190-ft., and Corsenside Common 1,190-ft. This 

 series can be traced from the Cumberland border to within a 

 few miles of the coast. 



The north-to-south series is well developed in the country 

 between Wooler and the coast due east of that town, thence 

 southwards along a strip of land about ten miles wide. The 

 highest surfaces bearing these striae are about 800 feet : most 

 of them are of much less height. Near the coast a few 

 examples trend slightly to the west of south (Tate records one 

 at Swinhoe bearing S.W. ; this observation lacks confirmation). 

 Frequently, the same rock-surface shows both series of 

 striations, and in one or two favoured instances, as at 

 Burradon and South Charlton, it is apparent that the 

 southerly trend is later than the easterly one. At Little Mill 

 the directions are to the south and west of south, and the 

 former is of earlier date than the latter [20]. 



The igneous rocks of the Cheviot area do not appear suit- 

 able for the preservation of striae. Two striae have, however, 

 been recorded in this district by Clough [6], one on the Baker 



