16 KENDALL: THE GLACIER LAKES OF CLEVELAND. 
Slack, an immense trench cut in the plateau of Roxby Old Moor, 
was the first channel for this overflow. A second, and much 
greater intake, Tranmire Slack, comes directly through the 
plateau from the north-west ; and a third, Moses Slack, of lesser 
size, from the north. These two latter orignated as mere gutters 
to carry of? the water from the ice-front when it was at the 
watershed. The Tranmire channel is connected with the Moors- 
holm Lake by a series of parallel aligned channels of great com- 
plexity. 
At Stanghow (Plate V.), six miles to the east, there is a 
well-defined overflow channel cutting the 625 contour, which 
appears to be the lowest channel possessing an easterly drainage 
in the north of the Cleveland Hills. Close to this Stanghow 
ohannel, and a few feet lower, is another valley, Bushy Dale, 
with a steep fall westward. This appears to have been con- 
nected with channels leading to the Vale of York, which was 
the only way of escape for the drainage of the ice along the 
northern escarpment in the closing stages of its retreat. 
At the lower end of Tranmire Slack, from its confluence 
with Hardale Slack, the valley is excavated through a flattened 
floor of gravel, which forms a notable pair of terraces. The 
lower terrace about the village of Stonegate is a shelf of hard 
sandstone in which the stream has cut a splendid gorge, but 
a little further up a series of derelict railway cuttings show 30 
feet of very coarse gravelly clay, containing so many fragments 
of Upper Liassic shale that in parts they make up a large pro- 
portion of the mass. Blocks of Jurassic sandstone are abundant, 
and many foreign boulders. The most noteworthy fact is the 
comparative rarity of Carboniferous rocks, and the abundance 
of Magnesian Limestone with botryoidal and other concretionary 
structures. These terraces were produced as a kind of marginal 
•delta between the hillside on the west and the ice-margin on the 
east of the valley. 
(2) The Eskdale Series of Lakes. 
The great overflows from Kildale and the Northern Lakes, 
ivith their related delta plateaux and the laminated warp of 
Danby, point to the existence of a great lake in Eskdale, which, 
