KiNAHAN — Killary Bay and Slieve Partry Silurian Basin. 725 
tract is evidently a detached portion of the gneiss and schist to the 
south of the bay, and the latter evidently is covered unconf ormably 
by the Silurian. 
In connexion with the metamorphic rocks of Connemara (north- 
west Galway), the statements of Dr. A. Geikie are ''not proven." 
The rugged aspect which is intimated as to be solely characteristic 
of the " most ancient regions of the world," is not so. It also occurs 
nearly invariably in all regions of metamorphic ingenite rocks, no 
matter what was their original age ; while, even in Ireland, and more 
so in America, there are regions in unmetamorphosed rocks that have 
very similar aspects. As to the most ancient regions of the world," 
one is, probably, the Laurentian Hills, which are tame compared with 
some of the areas in the Huronians and the Ontarians. 
The Connemarians were not "most carefully examined," as the 
most important places were not visited. 
The statement that there are no proofs of the metamorphism of 
older accumulation in Connemara is misleading. 
In the conglomeritic gneiss and schist of the area south of the 
Clifden and Oughterard road, there are indisputable proofs that the 
rocks originally were accumulations derived from the denudation of older 
strata. 
The subordinate quartzites in the schists of this tract were evidently 
originally sandstones; in some places even the original fragments are 
intact. 
In the same area some of the argillaceous rocks, especially in the 
archipelago north of Galway Bay, retain in a great measure their 
original sedimentary characters. 
In one place a little north of the Clifden road the limestone is 
scarcely changed, it containing the original chert layer and nodules. 
There are good reasons for supposing that my original classification 
of the groups of these metamorphic rocks is correct, because north- 
ward, eastward, and southward, from the Bennabeola range of hills, 
are found successively very similar groups of strata. 
On the other hand, however, the recent American work in the 
Lake Superior region has illustrated how deceptive may be the most 
careful grouping of metamorphic strata in an entangled area. It is 
thus expedient now not to be too positive. Indeed, it is possible that 
there may be a concealed unconformability under the Killary Silurian 
basin, while the Lough Conga conglomeritic zone may point to a 
second. The Umalians, however, by their fossils, are proved to be 
the equivalents of the Ordovicians, while the Lough Conga congio- 
