284 



21. Altmore Upper is one mile south-west of Lurrig quarry, No. 20. 

 In the southern boundary of this little townland, at a bridge on the 

 old road, the limestone is seen. It may be estimated here at 60 

 feet thick, showing a rapid diminution of thickness from what it is at 

 Lurrig. A few perches south of this, in a small stream at a waterfall, 

 in which a section is exposed, showing the bottom layer of the chalk, 

 with the greensand and red sandstone underlying. This lower layer is 

 8 feet thick, and is composed of a mixture of chalk, fragments of flints, 

 and small pebbles of white quartz. The mulatto stone, or greensand, 

 is only 8 inches thick, and it lies on new red sandstone, for there is no 

 lias. That rock is absent hereabouts. 



22. Cloghglass, or Ballyeemin Glen, is a mile south-west of 

 Altmore. Here the limestone in the river is but 20 feet thick. The 

 bottom bed consists of 6 feet of conglomerate, of flints, chalk, and small 

 white quartzy pebbles, resting on nine inches thick of greensand, which, 

 like Altmore, overlies red sandstone. 



A little below the chalk here, in the river bed, there are two 

 patches of mica slate peeping up through the sandstone, which appears 

 to have been cut quite through by the water. The lower patch has 

 brown grit in contact with the mica slate. In the upper the mica 

 slate is surrounded by a very coarse conglomerate, composed of large 

 pieces of mica slate, in a matrix of red sand, which is the lowest part, 

 the very base of the new red sandstone here. About this place is to be 

 found the greatest variety of rocks in a small space to be met with any- 

 where in the county. There are mica slate, brown Silurian grit, new 

 red sandstone, greensand, chalk, and trap, all within the distance of a 

 few perches. 



23. Gortnagross is a mile north of Cloughglass, Wo. 22. 



24. Tievebulliagh is a mile north-west of Gortnagross, Wo. 23. 



25. Eshery, about a mile north-west of Tievebulliagh, Wo. 24. 



These three localities are very much alike : they are in a wild, de- 

 solate, heathy region. In each of them the chalk rests on mica slate, 

 there being no new red sandstone nor lias to the west of "Ballyeemin 

 Glen, and the greensand quite inconsiderable — less than a foot. In 

 those places the limestone is from 20 to 30 feet thick. The quarries 

 are on high ridges or bluffs, emanating from Trostan Mountain on the 

 south, and separated by valleys. At the bluff points, between the 

 streams, the limestone crops out ; and it is in those points the quarries 

 have been made, being most accessible to the low country, where the 

 lime is used. The outcrop is continuous, but it forms a zigzag line, 

 projecting round the bluffs, and retiring up the valleys, so that the line 

 of the outcrop in the three localities resembles the letter W. In the 

 valleys the limestone is but rarely seen, being covered over with bog 

 and heath. There is no tillage so high up. Corn would not ripen 

 here, the locality being more than 1000 feet above sea level. The 

 height and thickness of the limestone at each place are given in the 

 Table. 



26. Ben Croaghan is more than four miles north-west of Isherry, 



