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PROCEEDINGS OF SOCIETIES. 
Dr. Griffith, in his reply to Mr. Kelly with respect to the great fault 
alluded to says :— 
il Ho doubt there is a fault of trilling character, having a north and 
south direction , visible near the coast of Bundoran; but in this case the 
strata on both sides belong to the same Calp series, while its north and 
south direction contributes nothing towards sustaining Mr. Kelly’s as¬ 
sumption of the great fault extending westward from Lough Erne to the 
sea coast near Bundoran; and the only argument he has brought forward 
in support of his opinion is, that the level of the Millstone Grit at Shean- 
hill, on the south side of Lough Erne, is 1135 feet above the sea, while 
the Millstone Grit on the north side of Lough Erne is only 150 feet above 
the sea; and, arguing on this difference of level of 985 feet, he assumes 
that a downthrow of about 1000 feet has taken place between the north 
and south shores of Lough Erne. But Mr. Kelly’s basis for the argu¬ 
ment has no foundation, because the strata on the north side of Lough 
Erne consist of Yellow Sandstone and not Millstone Grit.” 
As I am not aware of any answer from Mr. Kelly to this statement, 
I presume it sets at rest this part of the question. 
Dr. Griffith, in further confirmation of this theory, gives some very 
instructive sections:— 
1. Erom Butler’s Bridge, county of Cavan, and extending westward 
by Belturbet to Slieve B-ushan Mountain, crossing Cuilcagh Mountain, 
the valley of the Shannon, Lackagh and Benbo Mountains, and termi¬ 
nating at the sea-shore at the western base of Benbulben Mountain. 
This extends for fifty miles. 
In this case we have a succession of concentric circles, each sur¬ 
rounding the other, in an ascending order from the Lower Limestone by 
the Calp to the Dpper Limestone. 
2. Another section gives the district between Bundoran and Bally- 
shannon, and exhibits a similar overlapping of the Carboniferous strata 
round Dartree Mountain. 
3. In order to disprove Mr. Kelly’s views with respect to Slievebeagh 
mountains, Dr. Griffith exhibits a section from Lisbellaw, in the Silurian 
strata, across the valley of Clogher, thence over the Slievebeagh Moun¬ 
tains, it then crosses the Carboniferous Limestone valley of Monaghan, 
terminates in the Silurian strata of Scot’s House, west of the town of 
Monaghan. This section very clearly demonstrates the relative position 
of the Carboniferous beds. 
Professor Jukes, in his paper on the Calp of Kilkenny and Limerick, 
strongly confirms Dr. Griffith’s views with respect to those rocks by him 
called Calp , and by Mr. Kelly ascribed to the coal-measures. 
He divides the Carboniferous System of Limerick and Kilkenny into 
three divisions, of which Calp forms the central one. It is distinguished 
from the other two by its black colour, the others being gray; it also 
contains but few fossils, those that are found in it resemble in character 
those found in the upper and lower rocks. A section through Gowran 
would give the following results :— 
