Vol, 58.] TEESDALE, WEARDALE, AND THE TYNE VALLEY. O17 
Whin Sill and is at a higher elevation. The summit of Cronkley 
Scar is strongly moutonnée; but I was unable to find any actual 
strie, as the rocks have long been exposed to the action of the 
weather. , 
In the bottom of the gorge several well-developed lateral moraines 
occur; and as these reach the open valley below, they sweep round 
the foot of Cronkley Scar and spread out over Cronkley Pastures, 
between the Scar and the river. Near this point is a small lake, 
Tarn Dub, which is held up by one of these moraine-ridges, and. 
there are also several small peat-bogs entangled among them. 
Before proceeding to describe the deposits in the lower parts of 
the valley, it will be convenient to discuss those of Harwovd Beck 
and its tributary Langdon Beck, together with those at the junction 
of Harwood Beck with the Tees. 
On Yad Moss, near the source of Harwood Beck (1990 feet), there 
is a thin covering of Drift with a considerable thickness of peat on 
the top. Above Greencombe Sike the Drift becomes thicker, and 
much more moundy in appearance. At a point near the junction 
of Greencombe Sike with Harwood Beck is a large mound of bluish 
Boulder-Clay, which has been cut into by the river, so as to expose 
a clear section ; it contains boulders of Carboniferous Limestone and 
sandstone, also pieces of shale and grit, but no basalt-boulders. 
Comber Hill (8) consists of similar material, basalt being again 
absent. The country lying between Comber Hill and St. Jude’s 
Church is covered by similar Drift, lying rather more evenly over 
the land than is the case nearer the head of the valley. At St. Jude’s 
Church are several well-formed Drift-hills of typical contour. 
Fig. 4 is a section across the valley, as seen in the beds of 
Fig. 4,—Section across the valley of Harwood Beck 
(Upper Teesdale). 
Boulder 
Harwood Beck 
\ 
NV 
Sevendarg Sike and another small stream not named on the 
Ordnance Survey-maps. This is the only case in Upper 
Teesdale where the Drift is terminated by a moraine 
usually it thins out gradually against the slopes of the hills. This 
moraine is at a height of 1750 feet, and holds upa peat-bog of con- 
siderable dimensions against the hillside. 
Lower down Seyendarg Sike other ridges are to be seen running 
parallel to that last described ; and at a height of 1500 feet another 
peat-bog is seen resting between two ridges of Drift, 
