RESEARCHES AMONG THE PALEOZOIC ROCKS OF IRELAND. 143 
17. At Seegronan the inferior rocks abound with bands of crys¬ 
talline limestone, interstratified with mica slate. The marble is 
striped, white and gray mixed; and some of it a beautiful salmon 
colour. 
21. A good section of the Old Red Sandstone is visible in the 
river running through Kildress, from Orritor to Cookstown. Pe¬ 
culiar fossils are got in a bed of Red Sandstone near the base of it. 
Atrypa sublobcita , and two or three other small shells, occur in it. 
A band of red limestone, accompanied with red shale, is seen in the 
river bank, which has been quarried for use, and contains some of 
the usual fossils of the limestone. 
22. At Latbeg, near Clogher, in ascending the high ground 
northwards, the beds of brownstone dip to the N. W., at an angle of 
40° to 50°, and accumulate in that direction for about two miles, 
showing a great thickness of this brown grit. The rock in the val¬ 
ley dips at a lower angle, in an opposite direction; and, as both are 
sandstones, the anticlinal might be supposed the top of a convolu¬ 
tion; but this is not the case, as, if so, the rock dipping to the south 
would be brownstone, the same in lithological character as that 
which dips N. W., which it is not. It is a whitish or yellowish thin 
bedded flag, with alternations of black shale. 
23. The Old Red Sandstone at Gortnagross, near Cushendall, lies 
on mica slate, and its lower conglomerates are formed of rounded 
pebbles and fragments from that rock,—with little else. 
27. At Drummanbeg, three miles N. N. E. of the town of Ar¬ 
magh, in the large quarry whence was got sandstone to repair the 
church, I got a fish-tooth, which resembled a Plectrodus, but was 
much larger than those figured in the Silurian system, being above 
half an inch in length. 
30. The Red Sandstone at Kilcurry seems but thin, as the lime¬ 
stone appears not far from its base; but situated as it is, in the vi¬ 
cinity of metamorphic and porphyritic rocks, there may be a fault, 
in which part of the sandstone is buried. 
33. The strong green grit is well seen at Drumany, near Kille- 
shandra. On the road side the nearest sandstone lies N. W., nearly 
half a mile off in the flat land of Portlongfield, and lies nearly level; 
it is of a yellowish-white colour, and contains a few large rounded 
quartz pebbles. 
35. At Portrane Pier there is only a small part, about five yards 
