KENDALL : THE GLACIER LAKES OF CLEVKLAN I). 
29 
western margin of the ice-lobe from Fylingdales Moor to Biller- 
Howe-Dale Slack. This channel would carry off the water 
flowing from the ice-front, as well as that coming from tlie ice- 
free ground on Sneaton Moor. As the shrinkage of the ice 
progressed, a series of small shallow trenches were worn through 
the gravelly eastern banks of Grey-Heugh Slack by water from 
the ice-front. The best preserved of these is a small slack 
draining to the westward from Foulsike Farm. 
The next phase of retreat initiated a line of drainage, second 
in importance in the Cleveland area only to the great Xewton- 
Dale gorge ; this is the valley, bearing different names in its 
parts, which I may call the Jugger-Howe Valley (Plate X.). 
The margin of the ice had withdrawn northward so as to lie 
upon, or entirely behind, the Sneaton-Moor watershed. The 
shrinkage to the east brought the edge of the ice along the line 
of the present Jugger-Howe Valley, which at that time, however, 
Imd no existence. A recess in the hills at the northern end 
produced by the valley of Kirk-Moor Beck now became a small 
lake receiving the water draining from Sneaton Moor by the two 
channels mentioned, and also from its own section of the ice- 
front. A marginal channel was then initiated, which wound 
along the edge of the ice to join the Biller-Howe-Dale overflow^ 
from Lake Iburndale. Tliis new channel. Foulsike overflow, 
continued to operate for a long time, and its broad and steep- 
«ided gorge, though containing a great thickness of peat, still 
shows a depth exceeding 75 feet. It opens out abruptly at its 
intake into the very dissimilar valley of Kirk-Moor Beck. 
Simultaneously, perhaps, with the formation of this valley, 
or, possibly, of an earlier date, a magnificent channel was being 
-excavated along the southern edge of the great Robin Hood's 
Bay amphitheatre near Stony-Marl Howes. 
If the high ground south of Robin Hood's Bay was over- 
ridden b}^ the ice-sheet, it was but for a short time, and the ice- 
front broke up into a sinuate outline. The lobe which was 
thrust into the upper bay would have a strong southerly com- 
ponent of its motion, which would cause it to stand well away 
from the escarpment at its north-westerly angle, and to press 
more closely against the precipitous slopes on the south and 
