Vol. 58. ] GLACIER-LAKES IN THE CLEVELAND HILLS. 511 
with a few foreign stones. The level at which this is seen is about 
560 feet. This is about the level of the top of the Moor Grit at 
Fen Bogs. 
At several points along the approach to Fen Bogs, a similar scarping 
is observable. For example, at Thorn-Hill House it can be seen 
_extending across four fields; and farther on, at Moss Dyke, where 
the feature is very marked, there are clean sections visible, which 
show that although the scarp coincides in altitude with the outcrop 
of a hard rock, it is really due to an excavation in a facing of Drift- 
material, perhaps the delta of Moss Slack. At Thorn-Hill House 
the surface is Boulder-Clay with erratics, and at Moss Dyke the 
section is as shown in figs. 10 & 11. 
Fig. 10.—Section through the feature at Moss Dyke. 
Fig. 11.—WSection 10 yards upstream from fiy. 10, showing gravelly 
rotnwash bedded ayaiust grit. 
o 
° 
A well-marked scarp is also visible about Hollin House, near the 
Randay-Mere outfall, for a distance of fully half a mile. It is at 
the same altitude as that mentioned above, namely, 550 to 560 feet. 
Two features must be mentioned in conclusion, the deltas. At 
the outlet of the Murk-Mire-Moor channel, from Hollin House to 
Hazel Head, there is a considerable accumulation of gravel which 
may represent the delta of that overflow, but the erosion of the 
gorge would not supply a very large amount of material. 
The lower Moss-Swang and Randay-Mere overflow, however, is 
on a gigantic scale, much of it being at present 100 feet deep by 
