INTRODUCTION. 
XV 
In the spring of 1835 I made a very satisfactory examination of the 
low Craven country between Settle, Skipton, Colne, Burnley, Wlialley, 
Stonyhurst, and Slaidburn ; carefully reviewed the Bolland limestone ; 
and the vicinity of Craco, Burnsall, and Bolton bridge. 
In London I examined minutely the fossils collected from the 
mountain limestone of Ireland, by Mr. Weaver and Sir Philip Eger- 
ton, Bart., amongst which were some new species, and many which 
had become familiar to me in the North of England. I also saw 
some of Mr. De la Beche’s fossils from the limestones of Devonshire, 
and (a second time) the greater part of Mr. Murchison’s treasures from 
the Silurian system. 
Previously to the Meeting of the British Association in Dublin 
I had opportunities of greatly improving my knowledge of the Irish 
mountain limestone, and profited by the communications of Mr. Grif- 
fith, Capt. Portloek, Professor Seouler, and the collections of the Bev. 
S. Smyth, Dr. Greene, and Mr. R. Hutton, and received valuable dona- 
tions of specimens from Dr. Sadlier and Mr. H. Hutton. 
After the Meeting a party of geologists assembled at Florence 
Court, the hospitable mansion of the Earl of Enniskillen, where Lord 
Cole’s rich Collection was opened to me, and I could discuss the sub' 
ject of this Volume with Professor Sedgwick, Mr. Murchison, Mr. 
Griffith, Sir Philip Egerton, and M. Agassiz. Expeditions to three 
of the fine mountains which are visible from Florence Court o-ave us 
n 
a complete section of the limestone series in Ireland ; and while the 
forms of Ben .lochlin, Kulkeagli, and Belmore, seemed copied from 
Penyghent, Wild Boar fell, and Water crag, their constituent rocks 
were found closely analogous. 
Enriched with specimens, drawings, and new knowledge from this 
interesting region, I returned home to prepare my publication. I 
have however found it necessary to make two additional journeys, 
in one of which I have again surveyed Colsterdale, Coverdale, Kettle- 
