362 Leiter to the Countess of Gosford, Se. 
will encounter such an assemblage of little systems, as | have 
stated to compose the_surface of our world. 
“ Go due south, and at the quarry of Markethill, you leave 
the basaltic area, and euter a schistose district, which continues 
for some ten miles, when you enter the gray granite district, ex- 
tending from the summit ‘of the Mourne mountain®, by Newry, 
and Slieve Gullian, crossing the Forkil road, but not reaching so 
far west, as the Newtownhamilton road. . 
“Near Dundalk you enter a new district of argillaceous 
schistus, having crossed an interesting spot well worth examining, 
as a little to the north-west of Dundalk three extensive cal- 
eareous districts converge towards each other: one from Car- 
lingford to the eastward : another from Ball’s Mill to the north- 
west; the third from Ardee to the south-west; whether all 
secondary limestone, whether they actually meet at the point 
they converge towards, or how near they approach, remains to 
be inquired into. 
“© The Ball’s Mill and Ardee districts are separated from each 
other by a schistose district. 
* At Dundalk t, a new and extensive district of argillaceous 
sehistus commences; in the hills above Dunleer, they are often 
crossed by veins of quartz; near Drogheda we enter a calcareous 
district, very important to that country. 
** On the south side of Drogheda we first meet the stone called 
ealp, described by the Hun, Geo. Knox, in the Transactions of 
the Royal Irish Academy; ; its strata seem to me to deviate more 
from rectilinear planes, and to vary more suddenly in their ins 
élination, than any other stone I am acquainted with. 
“ At Cloughran church we find a calcareous district, or rib, 
stretching § from the foot of the hill of Howth, by Raheny and 
Cloughran, into the country of Meath; the boundaries of this 
valuable district, I am unacquainted with, but observe its comn- 
ponent strata more inclined to the horizon than any other lime- 
stone I have met with. 
‘‘ Immediately south of Dublin|| the calp is resumed, and in 
three miles we enter the granite district, stretching 4 from the 
sea up to the mountains. ‘The quarry stone used for building in 
Dublin is calp, and the cut stone gray granite. 
~« As we enter Wicklow county, we find a new hard stone 
strongly blended with quartz; of this Bray Head and the Sugar- 
Loaf Hills are formed. I could not find whether it was stratified 
~* Situated E of Newry, toward the coast. J. F. + Orrather SSW. J. F. 
t In proceeding again still south. J.P. § To the westward. J. FP. 
|| See Dr. Fitton’s Map, plate viiein Ph. M. xxxix. and its description, 
p.305. J.P. q| To the south-westward, according to Dr. Fitton. J.F. 
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