GEOLOGICAL SOCIETY OF LUBLIN. 
81 
or Devonian rocks of the English geologists. Mr. Kelly considers this 
rock to form a connecting link, if not an actual member, of the Silurian 
Palaeozoic rocks, and to he in no way connected with the true Old Red 
Sandstone. 
This forms one part of Mr. Kelly’s maxim, and here there is not 
much difference of opinion. 
In the next place he refers to Dr. Griffith’s subdivision of the true 
Carboniferous rocks. 
Dr. Griffith divides them as follows, in the ascending order:— 
1. Yellow Sandstone. 
2. Lower Limestone. 
3. Calp, alternating with black shale and sandstone, and said to be 
at Bundoran 1700 feet in thickness. 
4. Tipper Limestone. 
Mr. Kelly considers that there are good grounds for interpolating a 
series of Carboniferous Slates between the Limestone and Old Red Sand¬ 
stone, which would correspond with the Yellow Sandstone of Dr. Griffith; 
but he thinks that there should be only one Limestone , and he utterly 
objects to the existence of the Calp. 
In order to make out these propositions, he contends, on stra- 
tigraphical grounds, that the two limestones are one, separated by 
a succession of faults, and that the Calp in the neighbourhood of 
Bundoran is a portion of the Old Red Sandstone. The great mass of 
Calp described in Dr. Griffith’s Geological Map as extending over the 
Slievebeagh mountains from Dungannon to Lisnaskea, he places in the 
coal-measures, as he does also the Calp of the counties of Dublin, Meath, 
Kildare, and Westmeath, and also of the south of Ireland. His argu¬ 
ments chiefly apply to the vicinity of Bundoran, and both he and Dr. 
Griffith seem to have placed the result of the issue chiefly on the result 
of an examination of the carboniferous rocks in that district and in the 
N. E. corner of Lough Erne. Mr. Kelly has traced what he considers 
to be the line of the Old Red Sandstone, and contends that throughout, 
where the shales and sandstones of the Calp are introduced, there is 
ground for supposing that they belong to that formation, and underlie 
the true Carboniferous System. The difference of level between the lime¬ 
stones north and south of Bundoran he ascribes to a great fault which 
has thrown down the northern strata to the extent of nearly 1500 feet. 
As a proof of this he adduces the difference between the level of the base 
of the Millstone Grit on Sheanhill, on the south side of Lough Erne, and 
the same rock at Portinode, on the north side. The actual difference of 
level would be about 1000 feet, and he calculates that, in consequence of 
the rock dipping south, there is a downfall of about 1500 feet. 
The lithological character of this formation appears to vary so much 
in different localities, and it has been subject to so many metamorphic 
agencies, that on this ground it would be difficult to find any safe ground 
of distinction. It is to be regretted that Mr. Kelly has not made more 
use of fossil evidence in order to elucidate this intricate subject. 
