KiNAHAN — Hillary Bay and Slieve Fartry Silurian Basin. 723 
ward to Gal way Eay, we find northward, eastward, and southward, 
a remarkable similarity in the order and characters of the successive 
groups of strata. 
One thing, however, appears self-evident, which is, that the 
** Lough Conga conglomerate'''' belongs to a more recent age than the rochs 
of the Bennaheola ratige, as fragments of the latter rocks occur in the 
conglomerate. 
As the metamorphic rocks of West Galway are of uncertain age, I 
would suggest that hereafter they be referred to as Connemarians, 
being so well developed in that region ; and that the rocks of the 
Slieve Patrick District, south of Clew Bay, should similarly be named 
after the territory, and be called Umalians. 
The Connemarians, in lithological characters and grouping, are 
very similar to the metamorphic series of Perthshire, Scotland. I, 
however, now put very little faith in lithological characters, as they 
have been proved valueless in the Lake Superior district ; also in the 
county DonegaL Groups, however, may be of more value ; yet, at 
the same time they are not positive proofs. The very peculiar fine 
conglomerate, or pebbly grits (near Knappagh, five miles south-west 
of Westport), in connexion with the Erriff valley quartzose grits, 
have no counterpart in the Connemarian, except that possibly, as 
just mentioned, they may be the equivalents of the Lough Conga beds. 
But the pebbly beds in the hill immediately south of Westport are in 
aspect identical with the Mullaghsawnites of Donegal. These here 
lie above the serpentine range, while to the west, apparently below the 
serpentine range, are pebbly rocks, but more of the nature of a typical 
conglomerate. As in Donegal, Tipperary, Clare, and Perthshire, the 
Mullaghsawnites are found on slightly different geological horizons ; I 
would therefore suggest that the pebbly sandstones in the hill south 
of Westport, and the conglomerate in the Croagh Patrick range, may 
possibly be related one to another, more especially as the serpentine 
was originally a trappean overflow. 
[Summary. 
