224 Proceedings of the Uoyal Irish Academy. 



on the western flank of Eaghtin More,' and at the foot of the Gap of Maniore, 

 on theSvvilly side of the quartzite range. 



Granites are scattered over all the area north of the Sperrin Mountains, 

 being observed on the hills- and in the valleys. They are abundant and large in 

 the neighbourhood of J)unnamanagh, in the Glenniornan area, and at Moor 

 Ijouo-h, while a few were encountered on High Moor (N.-W. of Slievebuck) at 

 an altitude of 600 feet. They are also eoiunion at Claudy, and a few were 

 seen at Feeny. They lie scattered o\'er the Burntollet country, and between 

 AVaterside and the Faughan Valley. They are numerous along the southern 

 shores of Lough Foyle, over the country between Londonderry and Eglinton, 

 and on the hills to the south of here. 



The main track of the Barnesmore granite boulders can now be readily 

 traced. Picking it up west of Ballybofey and Stranorlar, it passes between 

 llaphoe and LiMbrd, nearer the latter than the former, sweeps down the 

 valley of the Foyle, crosses the city of Londonderry lying directly in its path, 

 and continues down Lough Foyle, I'oughly coincident with its western shores. 



The line limiting the fan of dispersal on the south and east can also be 

 fairly accurately fixed. A few granites were observed at Meenglass, near the 

 watershed between the Finn and Mourne Eivers, though at Eepentance close 

 by, one boulder only was detected, and this was after considerable search. 

 Here, therefore, we appear to be near the bounding line. A few occur at 

 Stirring, and one (4 feet in diameter) was observed at Trusk.^ A boulder of 

 granite (4 feet in diameter) was observed about one mile east of Meenasrone^ 

 on the north side of tire Mourne Valley, while another was seen on its south 

 side in the stream at Croagh. Boulders were met with at Carraffrin and to 

 the north of this locality ; none was observed to the south-east of this as far 

 as Lismullyduff Mountain and Meenagolan.^ The boulders occur along the 

 hillside sloping northward to Clady on the Finn. A single boulder was seen 

 at Lisky, just east of Victoria Bridge, and another near Elagh about three- 

 quarters of a mile east of this. The most southerly of these boulders was 



1 The boulder, 15 feet by 12 feet, occurring here at an allitude of oa. J 50 feet, is 

 derived from the adjacent mass of DunaH', or rather from the granite bo.sses rising from 

 the raised beach floor between Dunaff and this hillside. Bouklers of this Dunaff granite 

 have also strayed into the depressicm to the west of Clonmany, as was recognized by 

 Carvill Lewis {vp. cit., p. 112, here inadvertently spelled Dundaff). 



- E.g., Portlock (Report, p. 631) observes that at the N.W. of Slievekirk, the boulders 

 of granite are " of very great size, and form a large proportion of the whole." 



3 Drift is piled up against the we.stern slopes of Kinlitter Hill, while thousands of 

 boulders are strewn along the shores'of 'J'rusk Lough . These are chiefly schist and coaise 

 hornblendic rock with an occasional granite boulder. 



•• Possibly because of the fewness of op})ortiinities, the .area being practically distilute 

 of drift, and the fields bordered by hedgerows. 



