CHAKLiiSWORTH — C/ac/ftZ Geologij of North-West of Ireland. 267 



As lias already been shown, and as the retreat phenomena most clearly 

 prove, the " Central Axis " never had an existence over this part of its 

 supposed course. In view of this fact, and of tlie over-riding of this area by 

 a powerful ice-sheet from the north and north-west, it would be a matter of 

 the o'reatest difficulty to explain the preservation intact of a series of mounds 

 formed at an earlier period and almost transverse in direction to the later 

 ice-mo\'ement. 



The position of a later halt is marked by the almost parallel strip of 

 morainic country, extending from near Emyvale, passing north of Tedaviiet 

 to Scotstown and to the south-west of this place. Considerable quantities of 

 gravel are exposed in several places along this line. From this position the 



Man sliowing the caslwaid diversion of tlie streams, ainl llie alienant deflection of 

 tlie conlours nlong tlie S. slopes of Slieve Beagli (Co. ^[onagliaiil, lij- ice 

 j)i"oceeding eastward. Scale — 1 inch = 1 mile. 



ice retreated westward and north-westward, flowing in two large streams along 

 the southern and eastern flanks respectively of the Slieve Beagh mass, the 

 higher parts of which, by the thinning of the ice-sheet, now projected above the 

 ice-surface. The huge lobe to the east of this hill, thrust between Slieve Beagh 

 and Ballygawley, withdrew northwards along the lower eastern slopes of the 

 former, straightening on to the Augher-Clogtier line, and thereby forming 

 the eastern end of the Cloglier valley glacier. Tlie morainic ridge at Sniotnn 

 Bridge, on the eastern slopes of Slie\'e Ijeagh, marks one of the pauses in 

 this retreat. 



That tlie last movement of tlie ice in the area immediately south of Slieve 

 Beagh was eastward is clearly indicated by the diversion of the streams and 



