252 
Mr. Weaver on the 
bridge, ranges nearly east and west, and its laminae dip 80° toward 
the north, but the rock is partly subdivided by parallel seams into 
strata six and seven feet thick which dip 35° toward the north. (§ 113.) 
The day slate contains disseminated cubical iron pyrites. Above 
the cliffs, the outgoings of strata of coarse sandstone conglomerate 
are exposed to view. These acquire greater thickness by accumu- 
lation to the north and west, inclining under an angle of 15° in that 
direction, and at length descend to the road and river at the distance 
of about 20Q yards from the bridge, and as they recede from the 
subjacent clay slate rock they also assume a finer grain. These 
strata, which are one, two, and three feet thick, are not unfrequently 
traversed by small contemporaneous veins of quartz nearly parallel 
to each other, and in general parallel also to the line of the dip* 
The conglomerate is very similar in composition to that of the 
Dmmdowny quarries, adjoining the Barrow and the Suire, which 
yield excellent millstones ; the smaller components of which con- 
si ?t of quartz and mica in abundance, with some little white felspar ; 
and the larger, of a predominance of white, grey, and reddish 
quartz, and occasionally hornstone also, of various shades of grey, 
yeilow, and red, with a few casual small fragments of mica slate 
and clay slate. This rock presents a mottled aspect, from the 
i 
varied patches of its colours. 
§ 150. The Slievenaman group, (see Plate 7. No. 4. and 6.) 
consists of a nucleus of clay slate surrounded and surmounted by 
sandstone, which is connected with the sandstone hills that extend 
toward Thomastown on the north, and have also clay slate for their 
foundation. The relations of this tract are very similar to those on 
the south of the Suire, presenting strata, fine grained and hori^ 
zontal where they have attained a considerable thickness by accu- 
mulation, but in their line of apposition to the base below follow- 
