300 



</. E. Marr — Studies in Lakeland. 



(a) Shifting of the Drainage of the Trouthech. 

 The Troutbeck (T B) rises on Matterdale Common, about three 

 miles S.S.W. of Troutbeck station ; it runs in a general N.N.E. 

 direction until close to the station, when it turns shai'ply to the 

 west, and passes through a rocky gorge of insignificant size, cut 

 through the Skiddaw slates. In direct continuation with the upper 

 part of the stream is a swampy depression, just south of the station 

 and continued into Tarn Moss, from the eastern side of which, 

 (situated about -I of a mile E.N.E. of the station) a small beck 

 (Swinescales Beck, S B) takes its rise, and eventually drains into 

 the Eden, whilst the waters of Troutbeck find their way to the 

 Derwent. The rise from the angle of the Troutbeck to Tarn Moss 

 is almost inappreciable, and the watershed is not twenty feet above 

 this angle where the Troutbeck turns sharply westward. The 

 conformation of the ground shows clearly that the Troutbeck 

 originally ran by way of Swinescales Beck into the Eden basin ; and 



Map of the Upper Waters of the Glenderamacldn and Caldew. 

 Scale : 4 miles = 1 inch. Old lake marked by diagonal lines. 



the part of the old valley now occupied by Tarn Moss and the 

 ground immediately west of it having been filled by drift, this 

 part of the course of the beck was blocked and the beck forced 

 to turn westward, with the formation of a small lakelet which 

 has now been filled up, but which must have existed recently as 

 indicated by the name applied to the moss. It is here that the drift 

 gives indications of the mingling of boulders brought from the east 

 and south respectively, pointing to the accumulation of a specially 

 thick deposit at the meeting of the Helvellyn and Eden Valley 

 ice-lobes.^ 



' The extension of the Eden Vallej' ice to considerable heights on the west side of 

 Edenside is not discussed here, but see Physiographical Studies, No. 2, " Swindale," 

 Geol. Mag., Dec. IV, Vol. I (1894), p. 539. 



