Reports and Proceedings. 275 
for a Comparison between the Rocks of the South-west of Ireland and 
those of North Devon and of Rhenish Prussia in the neighbourhood 
of Coblentz. Mr. Jukes gave a sketch of the structure of the South 
of Ireland, with especial reference to the determination of the age 
of the ‘Carboniferous Slate, and pointed out that in the south- 
eastern counties the great Carboniferous Limestone and its under- 
lying black shale, or ‘ Lower Limestone Shale’ (transitional from the 
Old Red Sandstone to the Limestone, and from 20 to 300 feet 
thick), were together the equivalent of the ‘Carboniferous Slate’ 
(from 1,000 to 6,000 feet) and the included ‘Coomhola Grits’ of the 
South-western counties. The ‘Carboniferous Slates’ are composed of 
black shales (often slaty by cleavage) and grey grits ; the ‘Coomhola 
Grits’ are sometimes local sandstones, but occasionally 2,000 to 3,000 
feet thick in the lower part of the Carboniferous Slates. Mr. Jukes 
referred to the published ‘Explanations’ of the Geological Survey 
Map (sheet 187, &c., and sheet 192), in which he had described the 
Geology, and Mr. Baily the Fossils, for proofs of the ‘Carboniferous 
Slate’ and ‘ Coomhola Grits’ being contemporaneous with the ‘ Car- 
boniferous Limestone,’ resting, like it, on the Old Red Sandstone, 
and covered by the Coal-measures. He believed that they were 
formed in one and the same sea ; mud and sand being deposited in 
one part, while limestone was being produced in another by the 
growth of marine animals, especially by forests of Encrinites. In 
North Devon Mr. Jukes recognizes the ‘Carboniferous Slates’ and 
‘Coomhola Grits,’ with characters identical with those of Ireland, 
and passing under Coal-measures identical with those of Cork, 
Kerry, Limerick, and Clare, which rest on thick Carboniferous 
Limestone. So also near Coblentz Mr. Jukes was struck with the 
remarkable identity of the so-called ‘Devonian’ rocks with the ‘Car- 
boniferous Slate’ of Cork, and with the presence of red and yellow 
sandstones like the Upper Old Red of Ireland, whilst the Posidono- 
mya-beds with their coaly seams reminded him of the base of the 
Irish Coal-measures. 
The Rev. Prof. S. Havueuton welcomed Mr. Jukes’s paper as 
substantiating the opinions of Irish Geologists, especially as to the 
non-existence of a ‘Devonian System.’— Mr. W. H. Batty re- 
marked that the limestones of Plymouth, Newton-Bushell, &c., had 
no equivalent in Ireland, though they had in Nassau; and they 
might still be regarded as ‘ Devonian,’ being passage-beds between 
the Silurian and Carboniferous systems. 
Mr. Scort, on behalf of Dr. Carts, exhibited a specimen of an 
antler of Megaceros, with the impression of a cannon-bone on its 
palm; and two jaws of the same animal, which had also rubbed 
each other by fortuitous juxtaposition in the marl. These were 
from Limerick, where Mr. Hinckley had also found the specimens 
formerly described (Grou. Mac., No. XI. p. 216.) 
EpinsurcH GeEoLocicaL Society. — April 6; David Page, 
F.R.S.E., F.G.S., Vice-president, in the chair—Mr. Joun R. S. 
Hunter read a paper On the Carboniferous Limestones of Carluke, 
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