. 
“ 
q 
4 
85 
those transverse depressions which have resulted from the more- 
rapid lowering of the surface where the rocks happened to waste 
ata faster rate than those around. 
What is true of the Eamon is true also of the Eden. Both 
rivers are part of the same drainage system, and both have prac- 
tically the same history. 
Another case, which throws further light still upon the history of 
the Eden, is presented by the (Westmorland) River Lune. Some 
of the larger feeders of the Eden rise close to the principal sources 
of the Lune, in the north side of the Howegill Fells. Both sets of 
tributaries flow northward down the slopes left by the recession of 
the Carboniferous rocks as far as Ressondale (or “Ravenstone- 
dale”). Here, the two sets of streams find themselves in a wide 
valley, which ranges at this point nearly east and west, and 
coincides with the outcrop of the easily-wasted rocks at the base 
of the Carboniferous series. The slope the rivers have just left is, 
in fact, part of the First Plain, tilted by the movements that have 
affected the Carboniferous rocks, and since re-exposed by their 
gradual removal. The rocks forming the slope itself, as the Geo- 
logical Survey Map 98 N.E. will shew, consist of exceedingly-tough 
Silurian grits and argillites, whose rate of destructibility is much 
lower than that of the rocks now in process of being stripped from 
off them. The north side of the Ressondale valley, or the banks 
facing this slope, consists of a limestone escarpment, formed of the 
same beds, and presenting the same general features, as those 
which meet the Eamon on its emergence from Ulleswater. Like 
the Eamon, this other tributary of the Eden crosses the depression 
formed by the softer part of the Carboniferous rocks, makes straight 
away for the escarpment, cuts through it, and thence, as in the 
other case, flows northward into the main stream. Its history is, of 
course, identical with that of the Eamon. 
But the Lune behaves in a different manner, as I pointed out in 
the original paper. Arrived at Ressondale, it flows for a short 
distance close to the stream just referred to, and is in fact, separated 
from it by a barrier only a small number of feet in height. Then 
_ it turns to the west, flows a/ong the Ressondale depression, instead 
