586 Mr. J. Beete Jokes and the Eev. Samuel Haughton on the 



small quarry north of Tagoat. Near that village, beds of red sandstone and 

 conglomerate, exactly like Old Red Sandstone, were seen in a small quany, in- 

 terstratified with the slates of the Cambro- Silurian series. This fact makes it 

 possible that the red sandstones and conglomerates of Bonmahon, county of 

 Waterford, may in reality belong to the Cambro-Silurian rocks in which they 

 lie, and not to any former covering of Old Red Sandstone, from which they were 

 supposed to have been derived by downcast faults. In approaching the granite 

 of Carnsore Point and Crossfarnoge, the Cambro-Silurian slates become meta- 

 morphosed into gneiss and mica schist, and are traversed by veins of granite 

 and greenstone, and the granite itself is in some places also traversed by dykes 

 of greenstone. This is especially the case on the Saltee islands. 



The granite of this area differs in appearance from all the other granites of 

 our district, being a coarse-grained red granite, with large crystals of flesh- 

 coloirred felspar. Small flakes of black mica are sparingly disseminated through 

 it. A pencil-note on one of the Maps of the Geological Survey, in the hand- 

 writing, as believed, of Professor Oldham, mentions the existence at Carnsore 

 Point of segregated masses of mica, sometimes as much as two feet long by 

 one broad. 



V. Cleavage. 



Although it would be travelling out of our limits to enter at large upon 

 the subject of Cleavage, it would yet be wrong to pass it over altogether in 

 silence. 



Throughout our district, and indeed throughout the south of Ireland, all 

 the Pala30zoic rocks, both upper and lower, are more or less affected by slaty 

 cleavage, from the Cambrian rocks up to the Coal-measures inclusive. The 

 strike or direction of this cleavage is, with some few local exceptions, singu- 

 larly uniform, scarcely ever differing from E. N. E. by so much as 10°. Cleav- 

 age with this strike is to be seen over all the country, from the county of 

 Dublin to the extreme points of Cork and Kerry. Its dip, however, is not so 

 persistent, being sometimes to the one side, and sometimes to the other, and 

 varying greatly in amount; but in the Lower Palasozoic rocks of the S. E. of 

 Ireland it is always at a very high angle, often vertical, or inclined at a few 

 degrees from the vertical, either towards the N. N. W. or S. S. E. 



J 



