RESEARCHES AMONG THE PALiEOZOIC ROCKS OF IRELAND. 125 
similar conclusion results from observing the volume of the sand¬ 
stone at Scrabo, near Newtownards, in the county of Down, and at 
Armagh; while the limestone about Cookstown, perhaps, does not 
exceed 200 or 300 feet. Contrast this with the south. The sand¬ 
stone at Toberelathan, as just stated, is 430 feet. The limestone 
at Black Head, in the county of Clare, immediately south of Galway 
Bay, shows about 1200 feet in thickness over the sea level, in one 
of the best exposed and least disturbed sections in Ireland, besides 
some under the water, the thickness of which is not known. 
6. At Baheen, near Tomgraney, in Clare,I am inclined to doubt 
the result, 1460 feet. The section at Capparoe (No. 5), not two 
miles off, is only 790 feet, and this is backed by the section (No. 4) 
at Toberelathan, on the same band of sandstone, which, as just 
stated, is only 430 feet. The dip is low at Baheen, and, though the 
rock is visible at bottom and top, the section in the middle is 
covered with drift. A slight change of dip, from 10° to level, or 
an undulation under the drift, would nullify the result. 
12. At Currahill, in Kilkenny, the result, 1680 feet, appears 
large, but I give it as it turned out. There is a change of dip in 
the section; it gets flatter proceeding northward, towards the lime¬ 
stone; and the point where the change from 25° to 20° takes place, 
is not clear. 
13, 14, 15. The three sections, at different places, on the east 
flank of Forth Mountain, in Wexford, give the result as unusually 
thin. There may, possibly, be a fault along the south-east side of 
the mountain, near the edge of the quartz rock, in which some of 
the thickness may be buried. Indeed, there are grounds for sup¬ 
posing that the quartz rock mass of Forth mountain was pushed up, 
in the fact that, the tertiary blue marl of the county of Wexford, 
along its western or highest margin from Gorey, by Camolin and 
Enniscorthy, towards Wexford, is found at a general level of about 
200 feet over the sea, with only one exception that I know, and 
that is on the eastern side of Forth Mountain, two miles south-west 
of the town of Wexford, where a patch of this marl, resting on 
quartz rock, occurs at a height of something above 300 feet. This 
fact affords a strong presumption that Forth Mountain itself was 
forced up above the general level of the country, since the deposi¬ 
tion of the blue marl; and, if so, there must be a fault along the 
eastern boundary of the quartz rock, or near it. 
