806 SoLLAS — A 3Iap to shotv the Distribution of Eskers in Ireland. 



These are represented on sheets numbered 76, 86, and 96 of the one-inch map 

 of the Geological Survey, and are described in the corresponding " Memoirs," by 

 Messrs. R. G. Synies, and S. B. Wilkinson. To the south, in southern Galway, 

 on sheets 105 and 106, are fragmentary chains, described by Mr. G. H. Kinahan, 

 which may possibly belong to this system. The more important are : — 



7. Kilcornan chain. 9. Monivea chain. 



8. Athenry chain. 10. Gortachalla chain. 



Widely separated on the south and west, these chains pursue an undulating 

 and often broken com-se ; at first more or less parallel, trending from south-west 

 to north-east; afterwards, turning more towards the north, or even west of 

 north, they converge towards the small town of Kilkelly, county Mayo, 9 miles 

 N.N.W. of Ballyhaunis ; sometimes meeting and uniting on the way. Thus 

 the Moyne and Kilnalag chains (fig. 2) unite just before reaching the hamlet of 

 Kilnalag, forming an acute angle open towards the south ; the single chain so 

 produced joins, a little further to the north, with that of Tuam, which, in turn, 

 becomes closely associated with the chain of Dunmore. The western slopes of 

 these chains are frequently abrupt ; those on the east are gentler. The four 

 chains, thus united, may be termed the sub-system of Ballinlough. 



1. The Ballindine chain. — This, the most westerly chain (fig. 2), begins between 

 Claremorris and Ballindine, both in county Mayo ; its trend is mainly from south- 

 west to north-east ; and, though much interrupted by numerous gaps, some of 

 them over two miles in length, it is clearly traceable past Ballyhaunis, and as far 

 as one mile beyond it. Its component eskers lie, for the most part, in a single 

 series, but towards the north they form a multiple series by branching ; the 

 branches sometimes re-unite, enclosing elongated depressions. The three northern- 

 most ridges pass, on the north of Ballyhaunis, into a flat-topped mound, the surface 

 of which is 340 feet above sea-level, and 80 feet above the surrounding country 

 on its eastern side ; a single ridge is continued northwards from this mound with 

 the same elevation above sea-level, but with a height of only 60 feet above the 

 surrounding country. About one mile south of the mound, as shown on the map, 

 one of the ridges of the chain attains a height of 363 feet, but it is only 43 feet 

 above the surrounding country. 



The three small eskers, seen south of Ballyhaunis (fig. 2) may be regarded as 

 parallel outlying members of the Ballindine chain ; but the cluster on the west 

 near Claremorris, and the small group to the north near Kilkelly, cannot be 

 brought into direct relation with this chain. 



2. The Dunmore chain. — This fairly continuous chain (fig. 2) extends from 

 south-west to north-east for about 14 miles before it joins the plexus or knot, of 

 Ballinlough. Though a single series for the most part, it is in some places 



