xvm 
INTRODUCTION. 
Very few and slight notices concerning this district have reached 
the Philosophical Societies of Yorkshire ; the maps of Mr. Smith and 
Mr. Greenough are still the only graphical representations which can 
be consulted, (for Mr. Hall’s Lancashire map only reaches the border of 
Craven,) and the memoirs of Professor Sedgwick and Dr. Auckland 
on the Penine chain, of Mr. Winch on the Geology of Northumberland 
and Durham, and of Professor Sedgwick and Mr. Hutton on the Whin 
sill, with my own Essays in the Geological Transactions and Encyclo- 
pedia Metropolitana, contain nearly all the geological information that 
has been even partially given to the public. 
Mr. Nixon has inserted in the Philosophical Magazine and Annals, 
some of the results of his exact trigonometrical and barometrical mea- 
sures of the Yorkshire mountains ; these, combined with the results 
of the Ordnance Survey and some of my own measures, will be found 
under the proper head. The labour of reducing my numerous baro- 
metical observations was lightened by the assistance of my friend Mr. 
Wm. Gray, jun. 
I acknowledge w ith pleasure the useful information which I have 
received concerning the metalliferous veins of Cornwall from Mr. Hen, 
wood, and those of Flintshire from Mr. John Taylor. 
It has been my wish, to make just mention in the preceding notices 
of every individual who has accompanied me in my walks or in other 
ways specially aided my work ; those who have in a less direct man- 
ner interested themselves in the publication are by far more numerous, 
including nearly all the eminent cultivators of geological science. Among 
these I may be permitted to signalize one, the most competent of all 
men to have undertaken the description of this his native district, and 
whose labours on the borders of it rank among the best efforts of English 
geology. Professor Sedgwick’s examinations of the North of England 
have the same date as my own ; we met for a few moments near the 
High force in 1822 ; after ten years of independent research we com- 
pared results at Cambridge, and I found with great satisfaction that my 
