Stratified Rocks near Killarney and Dublin. 171 
pie slate which there alternates with the chloride quartz for 
that rock. 
It appears to me to be extraordinary, that when arriving at 
the conclusion that the chloride rocks of Turk and Manger- 
ton mountains were newer than the old red sandstone, owing 
to the observed dip to the south both of the old red sand- 
stone and the chloride rocks, Mr. Hamilton did not (with 
Mr. Weaver) consider these chloritic rocks to be superior to 
tlie carboniferous limestone of Muckross and Turk. The 
limestone beds all dip to the south towards the fault, and ap- 
parently underlie the chloritic rocks; and as the limestone 
strata rest upon the yellow and red sandstone, the„ natural 
conclusion should have been, that the whole of the strata to 
the south of the lakes of Killarney belonged to the millstone 
grit^ which we find resting on the same limestone to the north 
of the lakes. Mr. Weaver carefully observed all these dips ; 
and not having noticed the fault or unconformity of the strike 
of the old red and limestone series on its north side with the 
chloritic rocks on the south, and conceiving that the lime- 
stone together with the old red sandstone belonged to the 
transition series, he naturally concluded that the chloritic rock 
to the south belonged to the same ; but Mr. Hamilton has 
overlooked the southern dip of the limestone at the north- 
ern base of Turk mountain east of Turk cottage, and placed 
the chloritic rocks in a position in which they could not occur 
according to the dips of the strata, namely, between the old 
red sandstone and the carboniferous limestone series. 
I shall not pursue this subject, as I should hope that suffi- 
cient data have been brought forward to prove that the strata 
to the south of the Lake of Killarney, which Mr. Hamilton 
considers to be Devonian, do really belong to the Silurian 
system. 
I shall next allude to a paragraph in Mr. Hamilton’s paper, 
page 445, in which he states, “ that among other localities 
in which the yellow sandstone is laid down on the Geological 
map in positions in nxihicli it does not exist, he may mention 
the boundary of the carboniferous limestone, on the banks of 
the River Roughty in the Valley of Kenmare.” 
I wish Mr. Hamilton had mentioned the other instances 
that came within his knowledge as well as this, as I have no 
doubt I should have been equally well able to show that the 
boundaries marked were founded on actual observation. 
In the present case I shall merely observe, that at Kilgawan, 
on the north side of the valley of Kenmare, above Roughty 
Bridge, yellow sandstone occurs in considerable thickness, 
overlying red quartz rock, green and red clay slate, and red 
