154 TPIE VALLEYS OF SOME OF THE IRISH LAKES. 



coincides with the strike of the direction of the pre- 

 viously-mentioned faults connected with the groups 

 of hills called Slieve Bernagh and Slieve Aughta. 

 From Killaloe to Rinnaman Point, the bearing of 

 the lake is nearly south and north ; there the direction 

 changes, although no fault is known to cross the basin. 

 From Rinnaman the deeps extend for four miles 

 towards the N.N.E., when they are probably crossed 

 by a fault, north of which they bear north and south ; 

 this fault, however, has not been proved, but that it 

 exists seems probable, on account of the position of 

 the old red sandstone in the hill KE. of the Cornagoe 

 valley. 



A little farther north the deeps run into the great 

 east and west reach that extends between Scarriff and 

 Youghal bays. This east and west stretch lies in 

 the continuation of the limestone valley which 

 separates Slieve Bernagh from Slieve Aughta, and 

 this limestone seems to be brought into its present 

 position, not only by a synclinal curve, but also by 

 faults. On the north of the valley a large fault, a 

 downthrow to the southward, has been proved, while 

 near the south margin one or two lines of breaks 

 seem to exist ; but they could not be proved through 

 the valley on account of a great accumulation of drift 

 obscuring the geology hereabout. One of them was 

 proved, however, farther west in the low country in 

 the line of this valley, and in its strike are all the 



