r 145 ] 



are more than fi"x feet in diameter. On the top of the moun- 

 tain there is one that is monflrous. It is placed on the very 

 fummit; and it is fo placed, that though it is nine or ten 

 feet in length, it has not four in the bafe : all thofe flones 

 are of the iame nature with the fundamental granite of the 

 country. 



5th. Immediately above the granite towards the grotto 

 of Calypfo three or four beds of flate are to be feen, the upper- 

 moft of which is fo chequered with quartz that it may be eafily 

 miftaken for argillaceous clay. 



6th. Above thefe beds of flate are to be feen the calcareous 

 flielly beds which are extended down the river towards Lough- 

 correb, and continue fome miles on the Galway road. 



7th. Near Portcarren you can difcover a very thick vein of 

 calcareous fpar, in which you will find fome lead mixed with 

 blackjack. It is impoffible to bring up any level to it, as it is as 

 low as the lake. 



8th. Above the granite, on the fouth fide, begins the flate 

 mixed with quartz, which forms the foot of the mountain of 

 Mahiramore. 



9th. About halfway up the mountain the flate is very argilla- 

 ceous. On the fouth fide of Oughterard it contains fome hardly 

 Vol. VIII. T perceptible 



