QUATERNARY DEPOSITS OF BRITISH ISLES — BROOKS. 331 



U-shaped, obviously glaciated valley extending northeast and south- 

 west between Croghconnellagh (1,724 feet) and Barnesmore (1,491 , 

 feet) ; its floor is very flat and is occupied by an alluvial strip in 

 which the Lowerimore Eiver meanders. The Barnes Eiver has cut a 

 narrow V-shaped gorge in an old, rounded glacier valley which enters 

 the gap at right angles ; the glacier was banked up against the oppos- 

 ing flank of Barnesmore and spread out along the gap. To the north- 

 east the latter soon widens, but to the southwest the ice was very con- 

 fined and extended for about 2 miles. On this side it has left three 

 terminal moraines, in addition to the lateral moraines against the 

 sides of the gap. Of the terminal moraines the outermost and inner- 

 most are best developed and extend across the gap in crescent form, 

 the convex side outward. The inner moraine is double. These mo- 

 raines consist of granitic sand with occasional blocks and bowlders of 

 granite and fragments of schist; scattered over the surface are 

 rounded and irregular bowlders of granite. The outer and inner 

 moraines are cut through by the stream and extend on either side of 

 it ; the middle moraine is much less developed, and extends obliquely 

 down the valley on one side of the stream only. 



From the literature of the subject I had believed that these mo- 

 raines must all belong to a later recurrence of glaciation, but the ap- 

 pearance of the moraines does not quite bear this out. The two inner 

 moraines are very rough and fresh looking, but the outer moraine is 

 worn and rounded, and is not dissimilar in contour to the drumlins 

 outside the gap. It gave me the impression of a much greater age 

 than the innermost moraine, and it seems probable that here, as in 

 Scotland, the last general glaciation was quickly succeeded by local 

 glaciers. The inner moraines, on the other hand, may correspond to a 

 later cold period for which there is independent evidence. 



Other instances of local glacier moraines have been described in the 

 Survey Memoirs and elsewhere (see LI. Praeger's Bibliography), of 

 which I will refer to one only. In Glenclody, Leinster Mountains, 

 two distinct moraines occur, of which Mr. Ivinahan says, " The in- 

 side of the smaller moraine is very well marked in places, being 

 nearly a perpendicular wall from 20 to 40 feet or more in height, and 

 having the appearance of a huge Cyclopean wall " (sheets 148 and 

 149, 1887). This evidently belongs to the latest period of valley 

 glaciers. 



RAISED BEACHES AND ESTUARINE DEPOSITS. 



In western Scotland, as already described, J. Geikie and others 

 have found raised beaches attributed to three stages, the 100-foot 

 beach, the 50-foot beach, and the 25-foot beach, and we naturally ex- 

 pect these to occur again in northeast Ireland; the two latter un- 



