part 3] OLACIATION OF NORTH-EASTERN IRELAND. 405 



Tullyree Hill, and at 750 feet on Slievenabrook, all of which show 

 evidence of a movement from west to east. This movement is 

 confirmed by the transport of large numbers of boulders of quartz- 

 porphyry from the great dyke which runs from Craigalustra to 

 Hilltown, into the country round Bryansford. 



The strip of Silurian country south of the granite mountains is 

 deeply covered with drift, of which there are good sections along 

 the coast. 



Striations and moraine ridges show a coastwise movement of 

 ice in an easterly direction from the mouth of Carlingford Lough. 

 This, as has already been stated, was due to the fanning-out of 

 the ice on its escape from the narrows between the Mourne and 

 Carlingford Mountains, doubtless influenced largely as regards 

 direction by the eastward thrust of the ice from the country north 

 of Dundalk presently to be considered. 



The gravels in the southern valleys of the Mourne Mountains 

 are often of great thickness, and consist principally of granite. 

 They are disposed in moraine-like ridges in many parts. 



VIII. The Carlingford Mountains and the Slieve 

 Gull-ion Area (see map, fig. 7, p. 406). 



In the portion of this region that lies immediately north of 

 Slieve Gullion (which must not be confused with Slieve Gallion in 

 Tyrone) and Canilough Mountain the roches moutonnees and 

 striated surfaces indicate an ice-movement from west of north. 

 These occur near Bessbrook at 450 feet O.D., in the townland of 

 Eshvvary at 560 feet, on the northern flank of Camlough Mountain 

 at a little over 700 feet, a quarter of a mile north-west of Davitts 

 Cross Roads at 700 feet, and in two places near Aughanduff Lower 

 Mountain at 700 and 630 feet respectively. 



North-west of this area the country from Beleek by Ewarts 

 Cross-Roads to Jerrettspass is deeply covered with drift, both 

 boulder-clay and gravels, containing a profusion of boulders of 

 Silurian rocks, together with considerable numbers from the Tyrone 

 Axis; and near Jerrettspass are roches moutonnees at alti- 

 tudes of 250 and 450 feet respectively, also indicating a movement 

 from west of north. 



The drift occurs in mounds, some of which are drumlins : as, 

 for example, those at Tullyah Hill and Carrowbane near Belleek ; 

 others are more irregular in form, and probably morainic. 



In a large excavation midway between Newry and Camlough is 

 an exposure of decomposed granite, formerly worked for gravel, 

 covered by 15 feet of buff-coloured boulder-clay which contains 

 much local granite, with smaller quantities of Silurian grit and 

 slate, both showing striae, also quartzite, flint, Tertiary basalt, 

 vein-quartz, and red granite from the Tyrone Axis. The pit is in 

 the side of one of the mounds, and there is little or no drift in 

 the spaces between them, the granite and granite-wash coming to 

 the surface. 



