DU NOTEK BITUMINOUS COAL OF THE ARIGNA DISTRICT. 89 



at an elevation of between 71.0 and 1209 feet above the level of 

 Lough Allen,' from which it is distant about three miles ; a most 

 excellent road leads from the lake to within 400 yards of the out- 

 crop of the bottom seam of coal. The lower coal has here a slate 

 roof, from which fact, I should suppose that it corresponded to the 

 top coal of Aghabehy, and the upper coal here would therefore agree 

 with the thin seam, numbered 15 in Sir Ii. Griffith's section, and which 

 is thinly developed in the district to the west of Kilronan mountain. 

 Though this may be probable, I am aware that it is unsafe to attempt 

 to identify coal-seams merely from a correspondence in their "roof" 

 or " seat. At the outcrop of the lower coal, along the northern 

 brow of this mountain, the strata are clearly seen to have a slight 

 dip away from the hill, or to the north-east. This is explained in the 

 Section No. 3, which shows that this portion of the coal-measures 

 forms the northern side of a low anticlinal, the prolongation of which 

 to the north has been cut off by the denudation ; by tracing these 

 beds, however, up the mountain, they are found, as a mass, to be 

 bent synclinally and to form a shallow basin. The rise therefore 

 of the coal to the hill, on its northern flank, which causes the beds to 

 be self-draining, will, in all probability, be found to cease in the dis- 

 tance of 250 yards. 



The lower coal-seam of Greagh nasi i eve afforded the following 

 section on the northern face of the mountain : — 



Seat rock, sandstone. 



Holing G to 8 inches in brown sandy clay, and slightly micaceous 

 shale, answering to an impure fire-clay. 



Eire-clay coal, or fire-clay, with numerous bituminous layers and 

 strings through it, 8 to 10 inches. 



Coal from 1 foot 4 to 1 foot 6. 



Hoof, black slate clay, 7 to 10 feet. 



Hock roof, sandstone. 



In my table of thickness, etc., of the coals, I have called this the 

 two-foot coal. 



The upper coal seam, or that nearest to the top of the mountain, 

 was not as well exposed as the lower. I traced its outcrop across 

 the townland, but had not an opportunity of examining it closely. I 

 was informed, however, that it is of equal thickness with the lower 

 seam, but it wanted the shale holing, and its roof and floor is sand- 

 stone or "rock ;" we may therefore value it as an 18-inch coal. 



From the inaccessible nature of the ground in the townland of Alta- 



VOU. TI. 



