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The change effected by Mr. Griffith in this district, consists in 
removing the dark-gray and greenish-gray fossilliferous slate at 
Curreen’s Bridge from the transition series to the lower part of the 
carboniferous limestone system, in consequence of its resting con- 
formably on the sandstone, and dipping regularly under the lime- 
stone, as well as on account of its fossils. 
Mr. Griffith then describes a line of country between Mount 
Leinster, in the county of Wexford, and the sea-coast south of Cork. 
This district presents a succession of east and west valleys, in which 
flow the Suire, Blackwater, Bride, and Lea, with intermediate 
ridges, more or less elevated. ‘The valleys are occupied by lime- 
stone, beneath which, in each instance, are, in descending order, 
the carboniferous slates, yellow sandstone, red slate, quartz rock, 
the conglomerate and subjacent greywacké, thus presenting the 
whole of the former section with the exception of the millstone grit. 
Since the reading of his paper on this district at the Meeting of 
the British Association at Newcastle, Mr. Griffith has revisited the 
country, and found that his views of its structure, given in that 
paper, are perfectly correct ; and during his examination he directed 
his attention more particularly to the limestones in the neighbour- 
hood of Cork. A detailed section from French Furze, south of Cur- 
rigoline to Middleton and Broomfield, intersecting the limestones 
of Cork Harbour, was exhibited and described in the paper. It 
displays the same succession of formations, namely, carboniferous 
limestone, carboniferous slate, yellow sandstone, red slate, and 
quartz rock. 
To prove more particularly the correctness of his views, Mr. 
Griffith gives a minute account of the structure of the Monavollagh 
Mountains, in the county of Waterford. The base of these moun- 
tains consists of greywacké, covered unconformably by alternations 
of coarse-red or brownish conglomerates, coarse-red slate, and red 
quartzose slate. From Crotty’s Rock the conglomerates are suc- 
ceeded southward by alternations of coarse-red slate and quartz 
rock, the latter being interstratified, in descending towards the 
Blackwater, with beds of roofing slate, which occur only in the 
upper portions of the red slate series. On approaching the Black- 
water, the clay slate is succeeded, conformably, by yellowish-white 
sandstone, and sandstone slate, containing casts of Calamites. These 
strata are again overlaid, conformably, by the greenish-gray im- 
perfect clay slate, which alternates with the limestone of the valley 
of the Blackwater. The limestone of this valley is connected with 
that of the counties of Cork, Tipperary, &c., allowed by other geo- 
logists to belong to the carbomiferous limestone of Ireland. ‘The 
dip of the limestone strata in the valley of the Blackwater varies 
from 20° to 75°. Mr. Griffith then shows, that a similar though 
reversed order of succession prevails south of the valley; but as the 
strata dip southward 80°, they apparently overlie the limestone, 
the deceptive character being due to the contortions of the for- 
mations. 
It is not possible to follow the author throughout his details, but 
