*8 



THE GEOLOGIST. 



tawen, for the distance of three-quarters of a mile to near the farm- 

 houses of the latter townland, when I think it will be found to strike 

 S.S.E., and with that bearing to leave the district. 



It is a somewhat remarkable fact, that on the eastern side of the 

 fault just alluded to, the coals have never been accurately proved or 

 their outcrop denned, with the exception of a small space east of the 

 shafts, at the distance of one-third of a mile above the chisel-pit. 



The townland of Tullytawen lies to the south of Aghabehy, on the 

 southern slope of the mountain, and is traversed by the Aghabehy 

 fault, which cuts off the coals by a downthrow to the west. I was 

 informed that the " top coal " here measures 1 foot 6 inches in thick- 

 ness, with a fire-clay seat of 3 inches. The " crow coal " is stated 

 to be here 6 inches thick. Considerable workings have, for many 

 years back, been made in the " top coal " at this locality ; but as at 

 Aghabehy no record was kept of the amount of coals extracted, and 

 as the workings were on the pillar-and-stall plan, no sooner was the 

 coal extracted than the roof and floor were allowed to collapse, and 

 thus to obliterate all traces of the works. 



The "top coal" has been rather extensively worked, at the town- 

 land of Eover, which joins Aghabehy on the east. 



In the townlands of Carrownanult, Darreenavoggy, and Cross Hill, 

 the outcrops of the two coals is very well seen. The top seam is, 

 however, by all reliable accounts, lessening in thickness at this por- 

 tion of the coal-field, and is only 12 inches thick, while the crow 

 coal is only 6 inches ; here we find that the basal sandstones are 

 thickening, while the coal is thinning. It is just as probable, how- 

 ever, that in the Western portion of the coal-field of Kilronan or that 

 which extends into the Co. Sligo, the coal may thicken and improve 

 in quality. Around the circuit of the eastern termination of Kil- 

 ronan Mount, the coal-measures are traversed by at least six faults 

 radiating from the centre of the hill; of these the most considerable 

 occurs in the south-west portion of the townland of Kilronan moun- 

 tain, but owing to the flatness of the beds, which dip often as low as 

 3° a slight dislocation in their continuity would throw a coal crop 

 hundreds of yards out of its line of strike. The faults therefore which 

 occur to the east of that at Aghabehy would be of no importance in 

 bhe event of the coals being worked, as their direction and throws 

 could be most accurately determined and calculated. 



12. The Qreaghnaslieye and Jltagotdan Coal-fields. — This area, 

 which appears to afford the most valuable coals in the district, lies 



