Vol. 62.] ANNIVERSARY ADDRESS OF THE PRESIDENT. lxxix 



important ones, the extent of which must be more particularly 

 noticed. The first of these seems to terminate on the east in Great 

 Langdale, near the tarn of Elterwater. In a westerly direction it 

 is traceable up Little Langdale, and over Wry nose Pass across the 

 Duddon Valley, and thence over Hardknott. It then runs along 

 part of the Eskdale Valley to Eskdale Green, and passes over a 

 depression north of Muncaster Fell to Miterdale, where it is lost 

 in the alluvium along the lower part of that valley. This belt has 

 an east-north-easterly to west-south-westerly trend, and the total 

 distance along which it is traceable is about 15 miles. The character 

 of the rocks in this belt is well shown in Wrynose and Hardknott 

 passes. 



The second belt has already been briefly mentioned as running 

 through Dunmail Eaise. It seems to start from near the eastern 

 termination of the belt described above, and runs towards the 

 north-north-west. Tracing it northwards from Great Langdale, it 

 passes through the depression of Red Bank between Langdale and 

 Grasmere, thence up the Grasmere Valley to Dunmail Raise, down 

 the Thirlmere Valley and along Saddle Beck, and is probably 

 continued through the Skiddaw Slates of the Glenderaterra Valley 

 between Skiddaw and Saddleback, along a total distance of nearly 

 20 miles. 



The third belt leaves the first at a point about 4 miles west of 

 that from which the second diverges, namely, near Little Langdale 

 Tarn. Thence it is traceable north-westward through a depres- 

 sion on the north side of Lingmoor above Blea-Tarn House (where 

 the feature caused by it was pointed out to me some years ago 

 by Lord Avebury), and over the col into Great Langdale, thence 

 up the Mickleden fork of that valley, over Rossett Gill, past Angle, 

 Sprinkling, and Sty-Head Tarns (where it has already been noticed), 

 through Windy Gap between Great and Green Gable and thence 

 down a stream which forms one of the headwaters of the Enner- 

 dale drainage. Its total length is about 11 miles. 



Of the minor belts, those most readily studied are among the 

 great mass of highly-altered ashes and breccias of the Scawfell 

 Group in the central fells, Scawfell and its neighbours. Probably 

 they are actually more numerous here, owing to the greater rigidity 

 of the rocks of this tract than of those of others ; but they are also 

 more easy to detect, owing to the marked contrast between the 

 rotten rocks of the belts and the fresh un weathered rocks of the 

 interspaces between belt and belt. 



