118 IV. B. TFrig/it— Submerged Forests in Donegal Lakes. 



that height as in Lough Bannus. The outlet is to the east over rock 

 dehris and drift, the stream descending rapidly into a little rock 

 gorge. The submerged tree stumps, which are obviously in the 

 position of growth, occur in two places in a bay to the north-east 

 of the lake. They are beneath the level of the water even at the 

 present day.^ 



Drumgun Lough is a mile and a half due west of Pettigo. It is 

 surrounded for the most part by boulder-clay, but rock appears on 

 the shores in several places. The outlet is to the south between 

 boulder-clay and rock. There is a fairly large peat moss bordering 

 the lake at the east end, and a small one at the west end. Tree 

 stumps are visible in the water on the northern shore, but it is possible 



Fig. 2. MaiJ of Lough Avehy, on the scale of 3 inches to a mile, showing the 

 position of the submerged tree stumps and the contours of the surrounding 

 ground. 



that they are not in the position of growth. They are also to be 

 seen on the eastern shore, where the lake at one spot is cutting away 

 the bog. It is not clear in this position either that the submerged 

 stools are in place. This is, however, a good locality for cutting 

 a section in the peat, if it should ever be desired to determine the 

 relations more exactly. 



Lough Afurnagh lies on the moorland about two and a half miles 

 W. 30 N. from Pettigo. It is surrounded on all sides by crystalline 

 schists and peat mosses. It has its outlet to the west over a ledge 

 of rock, but the shore for about a hundred yards to the north of the 



^ In the ease of excavations ever being made with a view to further investigating 

 the oscillations of level and the sequence of plant growth, I would suggest the 

 sandy shore in the north-west bay of this lake as a suitable place. 



