718 
Proceedings of the Royal Irish Academy. 
CoDnemara conglomeritic schists and gneiss. Similar metamorphosed 
conglomerates occur in Mayo, Sligo, and Donegal, while Irving, Van 
Hise, &c., have described them in various places in the Lake Superior 
regions, especially in the Marquette district, and other places in Wis- 
consin and Michigan. 
The schists, gneiss, and granitic rocks to which the statements 
apply, lie principally in the tract hounded to the north by the road 
from Clifden to Oughterard, and from thence extending southward to 
Galway Bay. A brief epitome of the rocks found therein may be 
given. 
Granitic and schistose rocks herein are found, the first consisting of 
granites and gneiss. The granites are at least of three distinct types, 
called by me, in previous publications, Galway type,. Omey type, and 
Ouyhterard type. The Oughterard and Omey types are evidently 
newer than the Galway type, with its associated gneissose and schistose 
rocks. As elsewhere demonstrated, the Galway type granite graduates 
into gneiss, and from it into schists, the latter, apparently, merging 
into the unaltered Ordovicians. IN'orthward, in the Letterfrack and 
Kylemore district, there is a fourth type in the lacoliths of the Silurian 
eurites, while still further north, in the barony of Murrisk, county 
Mayo, there is a fifth type (Corvockbrack granite), which is probably 
of Devonian or even Carboniferous age. 
The latter statement, however, cannot be positively asserted, as, 
between the mass of the Connemara schists and the Ordovicians north 
of the Killary valley there is an overlying Silurian basin, under which 
there may possibly be an unconformability. 
The Galway type granite I have also called metamorphie granite, 
as the mass to the south-east, although without any structural planes, 
graduates northward through gneiss into schists, there being no 
hard boundaries, so that you cannot say exactly where you have left 
the granite and got on the gneiss, or where you have left the gneiss 
and got on the schist. This obscurity is specially apparent in con- 
nexion with the small isolated granitic tracts, in the schist area, to the 
southward of Glendalough and adjoining lakes. "Westward, however, 
the main mass of the granite has, in general, a hard boundary, this 
being due to intrudes of the Omey type coming up between the granite 
of the Galway type and the schists in the country to the west. 
As elsewhere stated by me, although I could not satisfactorily 
prove it, the metamorphie granite and its adjunct, the granitic gneiss, 
seem in their present characters — as granite and gneiss— to be newer 
than the associated schists. That is, the metamorphie action that 
