Vol. 58.]  IBESDALE, WEARDALE, AND THE TYNE VALLEY. 603 
valley, is now at 1100 feet. The stream which occupied this huge 
channel flowed into the valley of Beldon Burn, a tributary of the 
Derwent. 
Above its junction with the overflow the valley of Beldon Burn is 
a normal V-shaped river-valley, but immediately below the junction 
it widens out into a broad gorge with almost vertical sides, and a 
flat bottom on which the existing stream swings to and fro in a 
series of windings. All the small tributary streams which enter 
the burn below the junction of the overflow-valley, do so by a series 
of waterfalls, showing that this part of the valley was excavated by 
the overflow of the Allen and Devil’s Water lakes, the present 
stream being an obvious misfit. (See fig. 8.) 
Fig. 8.—Dragrammatic view of the Beldon-Burn valley. 
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The water was again impounded by the margin of the ice crossing 
the Derwent Valley below Blanchland, forming a lake in that 
valley. Thence it overflowed by a channel over Edmondbyers 
Common (1100 feet) into Burnhope Burn, the valley of which 
formed another of this chain of lakes. This, in its turn, drained 
over the Fell above Muggleswick Park at Lamb Shields (1100 feet), 
forming yet another lake which occupied the upper portions of the 
