556° MR. P. F, KENDALL ON A SYSTEM OF [ Aug. 1902, 
after it was cut, just as happened to Hardhurst Slack, but may also, 
as we have seen, have caused an actual reversal of flow. 
I think it not improbable that the series was partly cut in 
order from south to north, the Northstead Valley being the last ; but 
that a re-advance of the ice and second recession completed the 
cutting of all except the Northstead one, which, owing to its greater 
elevation, could not have been eroded while lower channels stood 
open farther south. 
In the angle of the Scarborough recess, two overflows of brief occu- 
pation may perhaps exist in the cols at Cross Lanes at 307 feet 
above sea-level, and beside the ancient camp near the Racecourse.} 
In the latter case, two valleys inosculate on a col at 464 feet O.D., 
but the abandoned head of the southern valley is traceable in 
the high ground to the eastward. Both these overflows, if overflows — 
they be, drained into the Seamer Valley. 
The last Glacial drainage-channel cutting through the Oolitic 
escarpment from the Scarborough recess, is the fine valley called 
Deepdale. This valley has many of the characteristics of the 
Seamer valley, from which it is separated by the bold ridge of 
Weaponness, culminating in Oliver’s Mount, about 500 feet 
above sea-level. 
The present watershed across Deepdale is situated well to the 
northward of the Corallian escarpment, and from this point a small 
stream flows in each direction. ‘The watershed, which is in a 
country heavily covered with Drift, is a little above the 250-foot 
contour. ‘There is a boulder of Shap Granite within 20 yards to the 
eastward. 
This valley seems to have carried off the drainage of a small 
lakelet about Wheatcroft, but though the valley is of considerable 
size, the amount of cutting was probably not very great. I do 
not think that the beheading of the stream by marine erosion 
would account for its present form and condition. JI should 
consider its sharp outline and precipitous sides to indicate the 
passage of a large volume of water through it at some date too 
recent for the comparatively slow erosion of the coast to explain it. 
From this point onward to Filey Brigg no definite overflows are 
traceable, marine denudation having probably carried away a 
considerable tract of land higher than that which remains. 
(8) The Vale of Pickering: Eastern End. 
It now remains to consider certain phenomena displayed by the 
country within the Vale of Pickering, that is, behind the Corallian 
outcrop. 
The closure of the Vale by a species of morainic barrier running 
through Hunmanby was long ago recognized by Carvill Lewis, 
Mr. Fox-Strangways, and others; but it has seemed to me very 
1 A re-examination of the ground has rendered me more sceptical as to these 
gullies 
te] . 
