KKXDALL : THE GLACIER LAKES OF CLEVELAND. 19 
IMoor, whereby a " lateral escape " was opened in the Murk-Mire 
overflow, so that the distal portion, Purse-Dyke Slack, was 
abandoned, and the outfall of the proximal half, Lady-Bridge 
Slack, was cut down below the 700-foot contour. This did not 
affect the Moss Slack overflow. The next shrinkage was a much 
more considerable one — the ice-margin withdrawing to a position 
about a quarter of a mile from the Murk-Mire Moor channel 
and parallel to it. and a new channel was commenced at the 
675-foot contour. The channel ran round the edge of the moor- 
land, and for a long distance was bounded on one side by ice. 
Its continuity was interrupted across the middle of its 
course by the natural valley draining the moorlands, known as 
Oakly Beck, so that this, like the higher channel, was in two 
segments — one. the more northerly. Moss Swang, and the 
southerly, Randay-Mere Valley (Plate VII.). 
The next shrinkage took place when Lake Eskdale was 
lowered by erosion of the overflow at Moss Swang to about 
625 feet. This opened a low gap in the side of the channel at 
Castle Hill (Plate VII.), and led to the abandonment of the 
oxbow there. Another explanation of the relation of this 
oxbow to the main channel of Moss Swang is that the Moss- 
Swang overflow had been deeply cut and then closed by a 
temporary readvance of the ice prior to the formation of the 
Castle Hill loop. The main channel continued to be eroded, 
and the oxbow, a splendid example of an overflow, stands more 
than 50 feet above the main channel. 
The last stage of ice-retreat traceable in this region is repre- 
sented by a deepening and deviation of the Moss Swang channel, 
showing that the Randay-Mere segment was the first portion 
abandoned. This is clearly shown by the lower level of the 
Moss-Swang outlet, as compared with the Randay-Mere intake. 
Xo overflows corresponding with these are to be found 
on the end of Two-Howes Rigg, and it is clear that the ice did 
not abut against that hillside at such an altitude as to maintain 
a barrier betw^een Lake Wheeldale and Eller-Beck Lake. The 
two became continuous, and may now be called Goathland Lake. 
During the succession of events here described the Fen-Bogs 
outlet was being lowered, but at a diminished rate, due to the 
