98 THE RELATIONS BETWEEN FAULTS, OPEN JOINTS, 



but also in the low country; a marked example 

 extending from Clifden to Cleggan Bay, tins being in 

 places over 100 feet deep, and not more than 30 feet 

 wide. 



Deep maums, or connecting mountain-gaps or 

 passes, frequently cross the hills ; two remarkable 

 ones being those of Salrock and Maumturk, the 

 latter giving its name to the mountain range which 

 it crosses. 1 



In the counties of Kerry and Cork are long, straight, 

 narrow, more or less regular and deep fissures tra- 

 versing the hills, which give a marked character to 

 the country. Some of these evidently are pre-glacial, 

 as the rocks bounding them are dressed, grooved, pol- 

 ished, and etched; but others, such as those stretch- 

 ing across the hills in the neighbourhood of Kilma- 

 killogue Harbour, appear to be post-glacial, while good 

 examples of some of the ice-dressed fissures occur 

 in the vicinity of Mount Gabriel, Schull, Cork. Very 

 large examples of these fissures occur, in places 

 cutting down to the base of mountain ranges, and 

 often diverting the water from one longitudinal 

 valley into another. These, however, will hereafter 

 be mentioned when speaking of the valleys of S.W. 

 Ireland, and at the present we will only draw atten- 



1 In the Salrock Pass there seems to have been a fault long prior to 

 the glacial period ; while subsequent to it there appears to have been 

 another movement along the old line of break. 



