Letler to the Countess of Gosford, Se. 363 
sr not; but neither in Ireland nor Scotland did I ever find gra- 
nite stratified; a point much contested by naturalists, as the 
stratification of granite is necessary to some of their theories, 
adverse to others. 
‘** Proceeding due west*, we again change our material in 
Powerscourt Park, which now becomes micaceous schistus, and 
it is over a mighty stratified facade of this stone, the Powers- 
court waterfall is precipitated. 
“* T believe the Wicklow material is mostly schistus, and on 
Croghan mountain, near the termination of the Military Road, 
i saw a beautiful junction of schistus and granite+, distinct and 
rectilinear, the granite and schistus passing into each other as 
much fer saltum as the pieces of a Mosaic. 
“© Though your ladyship may be tired of this long tour to the 
southward, I must make you acquainted with the arrangements 
in your own immediate neighbourhood. 
“Travel northward t by Richhill road; at the end of your 
own wall, you enter an extensive scliistose distrist, spreading to 
thé we-tward beyond the Newtownhamilton road; but on the 
eastward for several miles, you have the basaltic area withia 
200 or 300 yards of you, not indeed more thamtwo miles broad, 
and bounded on the eastward by a great schistose stratum, 
spreading into the county of Down. 
*¢ At Kilmore § you come direct on a great calcareous district, 
stretching from the westward of Portadown, by Loughgall and 
Armagh, far to the westward ||; and to the northwest by Gores- 
town, Clonfecle and Benburb 4], where the Blackwater, passing 
through a deep ravine, shows the limestone stratum, or accumu- 
‘lation of strata, to be above 200 feet thick. 
“‘ Had you gone** direct to Armagh, near the town you 
would have crossed a new arrangement of stone, resembling ba- 
salt in colour and in its subdivisions: Mr. Weaver tells me it is 
argillite strongly impregnated with quartz. 
** Had your ladyship stuck to the boundary of the basaltic 
area, it would have brought you very near both Richhill and 
Portadown, leaving them to the west; thence direct to Lough- 
neagh, and across the lake to the confines of Tyrone and Derry, 
thence to the west side of the summit of the ridge of mountaiw 
leading due north to the ocean, where our magnificent facades 
* From the Sugar-Loaf Hills. J. F. 
t+ Quere, is this the juuction mentioned by Dr. Fitton, at bottom of 
p. 305? or, is it on another Mountain of the same name, 6 or 7 Miles to 
the N of it?) J. F. ¢ From Gosford Castle. J.T. 
§ NE of Armagh, and NW of Ricbhill. J. F. || Of Kilmore. J. F. 
€ Is this the same with Benbervin Mill?, Ph. M. xxxix. p. 353. J. F. 
** [vom Gosford Castle, or Markethill, westward. J. F. 
commence ; 
