ELGEE : GLACIATION OF NORTH CLEVELAXD. 379 
with the lower stages of Slapewath proves that this line of 
drainage existed. But where arc the traces of the drainage out 
of Kildale corresponding to this state of affairs ? The valley 
of Sowerdale and the course of the Leven indicate no flow into 
the Vale of York. A readvance would, however. obHterate all 
traces of the Vale of York drainage from Kildale, and explain, 
I think, the very curious phenomena of the Castle Hill. 
I have looked for traces of the northward flow from Kildale 
along the Guisborough Valley, but no channels were found. 
The advanced position of the ice front near Ay ton must have 
prevented the Sowerdale and Leven flows from passing through 
the Dyke at Langbaurgh, as the channel there, if free, would 
at once have been utilised. Further east along the ridge of the 
Dyke is a low col at 350 feet, over which extra-morainic drainage 
must have passed, for a well-defined thougli small channel 
occurs here, but the fall of it is so slight that it is quite impossible 
to say in which direction the drainage has really gone. It must 
be admitted, however, that the non-occurrence of definite over- 
flows in the Guisborough Valley in alignment with Sowerdale 
is against the explanation given of the origin of that valley. 
Turning now to the Plain of Cleveland, I have to remark 
that after the phenomena above described had been produced, 
the ice stood for a long time for about a mile to the north of 
Stokesley, and a splendid series of moraines and gravel mounds 
was deposited. The most southerly and most striking of these 
moraines, evidently marking a halt in the retreat of the ice, runs 
from near Hilton to the east of Seamer (Plate LIV.). The road 
from Hilton to Seamer follows the trend of the moraine which, as 
might be expected, runs in an east and west line. It takes the 
form of a series of mounds of gravel and sand separated by s fight 
hoUows. These mounds have received local names, and, running 
from west to east, they a.re : — Boy Hill, 300 feet ; the Kirk Bank, 
at Seamer, 325 feet ; Rough Hill, 300 feet ; and Hunter Hill, 
300 feet. To the south they slope gradually down to Stokesley, 
but on the north they have a very steep descent to 250 feet, 
especially north of Seamer, where the ground is very flat and 
peat-filled. The Kirk Bank is about 75 feet high, and near the 
church is an old gravel pit so grassed over that no clear section 
