SOUTHERN TART OP THE LAKE-DTSTRICT. 



155 



Such cases as these here enumerated must either be the result 

 of the ice having so great a thickness as to be fairly above these 

 separate cols or passes, and thus flowing in some instances directly 

 through them, or due to floating ice. I cannot easily conceive how 

 any land ice could produce the grooves across the ridge south of 

 Bow Pell, unless a great sheet was forced across the district from 

 the outside, either from the east or west ; and this idea seems quite 

 untenable. 



Much more drift is found in the valley on the west of the Wrynose 

 Pass than on the east ; and I am strongly inclined to think that 

 during the submergence a current ran from west to east through a 

 Wrynose Strait, and that the cases across Bow Fell indicate that 

 the depression may have reached an amount little short of 2500 feet 

 (woodcut, fig. 4). 



During submergence there could be no direct communication 

 between the east and west halves of this southern part of the lake- 

 district until the sea reached the level of rather more than 1250 

 feet. At 1500 feet, the contour of the country would be as repre- 

 sented in woodcut, fig. 2, the Coniston group being separated from 

 mountains to the north by the Wrynose Pass. In woodcut, fig. 3, 

 the contour at 2000 feet is shown, and in fig. 4 that at 2500 feet. 

 The map in woodcut fig. 1 shows not only what the form of the land 



Fig. 1. — Contour-map showing the probable form of the land when the 

 submergence had reached 1000 feet. (Scale 3 miles to y 7 ^- inch.) 



might be during a submergence of 1000 feet, but also indicates the 

 area of land once covered by the confluent glaciers, the white parts 

 representing the ice. Fig. 2 might be similarly used*. 



* The lines drawn on fig. 1 are those along which some of ne principal 

 sections have been taken. 



