Chaeles WORTH — Glacial Geology of North-West of Ireland. 271 



Fiveniiletown, reveal the nature of the deposits ; thej' are composed of water- 

 worn pebbles,! sand and gravel. 



A further recession of the ice at the extremities of this line caused the 

 formation of the moraine, running from the southern flanks of the Fintoua 

 hills about Ballyness Mountain, under I'ivemiletown and Colebrooke Park,' 

 to the neighbourhood of Lisbellaw.^ The whole of Colebrooke Park, and of 

 tiie park of Blessing-bourne at Fivemiletown, is underlain by spreads of 

 morainic and outwash gravel. A later moraine is represented by the 

 irregular country stretching north-east and south-west from Creeve Hill.* 



A still later pause is indicated by the broad and undulating moraine 

 which runs parallel with and along the foot of the hills from north of Tempo 

 to the vicinity of Lisbellaw, and which culminates in Gliindees Hill. 



These billowy moraiuic belts, of considerable width, are frequently 

 composite ; they contain subsidiary morainic walls, readily distinguishable 

 in the broader surface. Many instances of such composite moraines were 

 noted. 



These indicate, as Mr. W. B. Wright has shown in the case of the 

 Killarney moraines," a major and minor periodicity. I have not attempted 

 during this investigation to determine the periodicity. 



Continued shrinkage of the ice from the position, marked by the large 

 " Glundees moraine," caused a division into separate glaciers, thrust eastward 

 through the gaps in the " Brougher Mountain Eange." The series of lobar 

 moraines formed during this withdrawal greatly resemble in their internal 

 structure and mutual arrangement those observed in the hill country to the 

 west of Cookstown. The great morainic belts to the east of this, along the 

 foot of the range and beyond, furnish a parallel witli those of the country 

 east of the Beleevnamore Eange of Tyrone. 



The Permanagh moraines are by no means so patent nor so picturesque 

 as those of Tyrone, though greatly excelling these in number and in 

 strikingness of arrangement. The map brings out clearly the behaviour, 

 mutual arrangement and adaptation to the relief of these lobar moraines of 

 the " Brougher Mountain Eange." 



Of the breaks in this range, the chief are the Glen and Esk valleys. The 

 finest series of lobar moraines are to be found in the Esk recess. The 



1 The chief constituents include quartz, quartzite, carboniferous limestone, sandstone, 

 shale, conglomerate, an occasional porphyry and epidiorite. 



° -Between these places it is known as the Long Range. 



^ Lisbellaw itself stands on rook. 



* This hill is entirely "solid." 



^ Minor Periodicity in Glacial Retreat, Proc. Roy. Irish Acad., vol. xxxv, sect. B 

 (1920), p. 93. 



