Fig. 24.—Seetion along the watershed, from Cowgate Slack to Hayburn-Wyke Station (Newlands Date). 
“YIEIG ISYNYUPsIER 
advantage to the new outlet, 
which developed into a large and 
deep valley, now very swampy in 
its upper parts, but drier lower 
down where the steep fall enables . 
a small stream about a foot wide 
toform. This valley is just a mile 
long, and falls in that distance 
100 feet. It terminates abruptly 
at 400 feet in a fine terrace, which 
evidently represents the level of 
another lake to be presently men- 
tioned. The intake of Ringing- 
Keld Slack was cut down to about: 
551 feet. 
The further course of the ice- 
margin is weil shown by Oxdale 
Slack, a magnificent gorge nearly 
a mile long, and not less than 
75 feet deep at the intake, 
which gashes completely threugh 
a bold spur composed of hard 
and massive grit forming the last. 
limb of the Lake-Hayburn water- 
shed. There is scarcely any more 
£ instructive and convincing ex- 
= ample to be found in the district 
= than this wild rocky gorge sweep- 
ing completely through from side 
to side of the hill. The cutting 
was commenced at a little over 
450 feet, and it ceases at a little 
above 375. The form of the 
contours at the intake shows that 
a small lake probably received 
the water from Ringing - Keld 
Slack and transmitted it to 
Oxdale Slack. 
Another overflow, rather doubt- 
ful, and difficult to observe on 
account of a thick growth of 
young pine-trees, crosses Clough- 
ton Moor at a slightly lower ele- 
vation. But the next marked halt 
of theice-margin was at Cloughton- 
Moor Cottage, where a new over- 
flow was formed which commenced 
to operate at about 500 feet O.D., 
and continued to carry the drainage 
until, by the cutting down of the 
