198 Scientific Proceedings, Royal Dublin Society. 
wasafterwardsmadeinthis. The Knockmealdown and Commeragh 
Mountains in Tipperary and Waterford are O.R.S. These were 
soon to be altered to Transition, and afterwards back again to 
O.R.S. What we name below the Fintona district, extending 
from Lough Erne to Pomeroy, is marked O. R. 8.,and so remains to 
the last, though Griffith doubted the propriety of this afterwards. 
Griffith mentions in February, 1836, that one desideratum in that 
map is a subdivision of the Tr ansition, or Greywacke, slates, which 
the Welsh ones had received from Murchison. No rocks decidedly 
belonging to the Silurian system had been observed by himself, or 
described by others, as occurring in Ireland. Another desideratum, 
he says, is some division of the Conglomerate and Old Red Sand- 
stone. It will be necessary to distinguish between the Old Red 
Sandstone and the sandstone connected with the lowest part of 
the Carboniferous Limestone. Another desideratum, he says, is a 
subdivision of the Carboniferous Limestone. On that map there 
were only two colours for the whole Carboniferous system: blue 
for the Limestone and the connected rocks, and black for the Coal 
formation.* At that time he supposed that the Calp of Kirwan 
was lowest in the Limestone division. In his paper to the British 
Association he speaks of the coal fields, and mentions that bitu- 
minous coal is confined to the north; he speaks of the New Red 
Sandstone and the Lias, &c., of the N.E. He mentions that the 
Wexford marls contain shells to be compared with those of the 
Crag. He speaks also of the Eskers. This map was ordered by 
Government to be reconstructed and engraved under the Board of 
Ordnance. This was not completed until 1838. 
In 1837 the map was exhibited to the British Association at 
Liverpool. The Yellow Sandstone was now separated from the 
Old Red, and put at the base of the Carboniferous system, and 
his triple division of the Carboniferous Limestone into Lower, 
Middle or Calp, and Upper, was now first published. 
In 1838 was published for the Railway Commissioners, of whom 
he was himself one, his “ Outline of the Geology of Ireland,” with 
his map on the reduced scale of one inch to ten miles, the date on 
which is April 28. The value to the Commissioners of the infor- 
mation thus supplied to them is obvious. 
* We here perceive that Phillips’ small map above mentioned contains one of Griftith’s 
improvements on his map of 1835. The Millstone Grit of Leitrim and Fermanagh is in- 
dicated, as in Griffith's small map of 1838. 
