354 Scientific Froceedinga, Royal Dtihlin Society. 



granite and granitoid gneiss is readied, outlying patches of these 

 granites and gneiss occur in the country southward of Glen- 

 dalough and Recess, 



It will be also found that the further we proceed eastward, 

 the more of the rocks of the older groups are absorbed into the 

 granite and gneiss ; so that in the country south and south-east 

 of Oughterardjthe intense metamorphism has also affected the rocks 

 from those of series B 11 down to those of the Bally nahinch 

 series (B 8). Going eastward from the Atlantic to the south 

 portion of Lough Corrib, the graduation is along the strike of 

 the strata; but it is transverse to it if we go south from Ough- 

 terard to Galway Bay.* 



Let us now go from Bennabeola northward across the north 

 series of the anticlinal, and we find that the rocks graduate from 

 schists, through submetamorphic rocks, into unaltered fossili- 

 ferous rocks {Doolough beds), (B 11), at Rossroe, Mweelrea, and 

 Toormakeady,the fossils being of Llandeilotype; while if thefossili- 

 ferous rocks of Mweelrea are followed eastward, they are found 

 to have graduated into schists in the country between Doolough 

 and Lough Mask. 



In Mr. Mitchell Henry's hills between the Kylemore and Culfin 

 valleys the hornblende-rock, ophites, &c.,the upper members of the 

 Great TTiicalite series (B 10) are conspicuously developed- This is a 

 very interesting district, as some of the rocks in it, which are unde- 

 niably above the quartzites of Bennabeola (B 6), are lithologi- 

 cally more allied to the Donegal rocks than any others in West 

 Galway ; and it appears to me if the similar rocks, to the south, in 

 the Great micalite series, are to be classed as Laurentian that these 

 also must be similarly classed ; which would be absurd. 



Furthermore, beginning to the N.W. at Ballinakill and going 

 eastward and south-eastward along, the rocks of the Kylemore 

 Limestone series (B 8), past Kylemore and the Maum Turk 



* Mr. E. T. Hardman has called my attention to conglomeritic rocks that contain 

 blocks and pieces of grabbro, which he found in the supposed Laurentians of Sligo and 

 Leitrim ; and he suggests that these must be pieces of rocks belonging to an older group 

 than that in which they are now found. I would also point out, as I have mentioned 

 in the Geological Survey Memoirs and elsewhere, that there are very similar con- 

 glomeritic rocks in the co. Galway in the rocks now said to be Laurentians. These Galway 

 conglomeritic rocks are in the HornhJendite and talcite series (B 11), while the con- 

 tained pieces are similar to rocks in the Greut micalite series (B 10) which was one of 

 my reasons for supposing the latter rocks to be older than the former. 



