Vol." 51.] ME. J. E. MAEE ON THE TAKNS OF LAKELAND. 



39 



be found to ran from the bay north of the present exit, round the 

 north side of Cockly Crag, and so to the present stream at Cockly 

 Moss. This is more likely to be the case as the depression from the 

 bay is in a direct line with the lower part of the course of the stream 

 entering Easedale Tarn at the other end, and between these points 

 are the deepest parts of the tarn, with soundings of 53, 60, 71, and 

 59 feet. However, enough was seen to show that Easedale Tarn 

 need not be a rock-basin, though the solid rock does occur in the 

 stream close to the point of exit. 



More satisfactory evidence was obtained in the case of Codale 

 Tarn, situated at a height of over 1500 feet above sea-level (see 

 fig. 5). This tarn occurs in a lateral valley running in a south- 

 south-westerly direction to join the main valley which starts from 

 Sergeant Man, the longer axis of the tarn being parallel with the 

 direction of the lateral valley. The stream which leaves the tarn 

 runs at right angles to this direction, and nearly parallel to that of 

 the main valley, which it joins a few hundred yards below the tarn. 

 The stream at once runs over solid rock, and the exit is not at the 

 end but at the side of the tarn. A moraine-blocked valley is seen 

 passing from the lower end of the tarn, past Belles Knott, and 

 quickly joining the main valley. No solid rock is visible down this 

 partially-buried valley for many scores of feet below the lake-level., 

 and as the tarn, from 



the abundance of ve- Fig. 5. — Plan of Codale Tarn. 



getation therein, is 

 probably very shallow, 

 the blocking-up of this 

 lateral valley by mo- 

 raine-material would 

 be quite sufficient to 

 form the tarn. Much 

 moraine is seen in the 

 main valley where the 

 moraine-filled valley 

 joins it, and it is quite 

 natural to expect that 

 a moraine from the 

 receding glacier origi- 

 nating in the direction 

 of Sergeant Man would 

 block the lateral val- 

 ley. 1 [Scale: 4J inches =1 mile.] 



Stickle Tarn lies beneath the Pavey Ask precipice in what may 



1 These moraine-filled valleys are usually marked by continuous depressions, 

 probably due in some cases to the accumulation of less moraine at the valley - 

 bottom than elsewhere, but probably in the great majority of cases (where the 

 moraine has filled up depressions and elevations to a fairly uniform height) to 

 the greater shrinkage of the thick moraine in the valley than of the thinner 

 material on the elevations. In the following descriptions the term ' moraine- 



