AND THE FORMATION OF VALLEYS. 103 



and Corra fault. But that they are really lines of 

 dislocation seems probable, as there are so many of 

 them in nearly parallel lines ; also the basal beds of 

 the Old Red on the upthrow and downthrow sides 

 are similar, which would scarcely be the case if they 

 were lines of cliffs. 



Bounding the south of Slieve Aughta is the 

 Scar riff valley, which separates it from the mountain 

 group called Slieve Bernagh, which lies to the south. 

 This valley has at least one accompanying fault 

 which bounds it on the north, and seems to run 

 from Feakle Lower, to Mount Shannon. The lime- 

 stone and Silurians are brought together a little east 

 of a hamlet called Coolcoosaun. A mile and a half 

 S.E. of Feakle the most westerly traces of this fault 

 were remarked. From this it can be traced to Cool- 

 coosaun. On the east it seems to extend to Lough 

 Derg, but no positive proofs were seen farther than 

 the Bow River. 



The second valley can be traced from Lough 

 Blarnagh to Lough Ea, where it crosses into the 

 Lough Graney basin, and down the Lough Ea or 

 Cahir River to Lough Graney, from whence it runs 

 along the Corra and Derrygoolin Rivers, coming out 

 of the Lough Graney basin on the north of Ardeven. 

 Its fault has been traced from near Maghera Lough 

 to Ardeven The Cloonnagro and Corra fault above 

 mentioned. From the Maghera River towards the 



