Vol. 58. ] GLACIER-LAKES IN THE CLEVELAND HILLS. 505 
is a much greater mass of gravel buried beneath a layer of Warp. 
The appended map (fig. 5) shows the surface of the ground at 
Pickering, which is seen to have the form of a digitated fan, precisely 
similar to an Alpine cone de déjection, but with a lower slope. 
Tt will be shown in the sequel (p. 531) that Newton Dale ceased to 
act as an overflow long before the close of the Glacial Period, 
and the layer of Warp which partly covers the delta is seen to 
have considerable significance. 
Contour Map: oF PickerRING DELTA. 
[The gravel-covered area is copied from the 1-inch map of the Geological 
Survey. | 
(3) The Eskdale System of Lakes. 
The existence of an overflow at Newton Dale clearly implies a 
lake on the northern side of the watershed, and this could be pro- 
duced only by an ice-dam blocking some part of Eskdale at an 
altitude exceeding 525 feet, the level of the overflow. 
Direct confirmation of this implication was obtained from a first 
inspection of the maps. A series of ‘severed spurs’ forming an 
aligned sequence of overflows was found to extend from Eskdale 
across the spurs separating the Valley of the Esk from that of the 
