88 
THE GEOLOGIST. 
tawen, for tlie 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 defined, 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 TuUytawen 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 incites. 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 Hiil, 
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 
the event of the coals being worked, as their direction and throws 
could be most accurately determined and calculated. 
2. The GreagJinasUeve and Altagowlan Coal-fieJds. — This area, 
which appears to aff'ord the most valuable coals in the district, lies 
