QUARTERLY JOURNAL 



OF 



THE GEOLOGICAL SOCIETY OF LONDON. 



PROCEEDINGS 



THE GEOLOGICAL SOCIETY. 



Dec. 16, 1846. 

 William Twining, M.D., was elected a Fellow of the Society. 



The following communication was read : — 



On the Classification of the Fossiliferous Slates of North Wales, 

 Cumberland, Westmoreland and Lancashire (being a 

 Supplement to a paper read to the Society, March 12, 1845). 

 By the Rev. A. Sedgwick, M.A., F.R.S., Vice-Pres. G.S., 

 Woodwardian Professor of Geology in the University of Cam- 

 bridge. 



Introduction. 



Before I proceed to the examination of details (and I wish to avoid 

 details as far as possible), I may state in a few words what are the 

 leading objects of the following paper. 



1. 1 wish to describe some new facts (observed during the past 

 summer) that appear to connect together, and give a consistency to, 

 various sections through the older Palaeozoic rocks, which have been 

 exhibited and explained during the meetings of former years, and 

 several of which have been published in the Proceedings and the 

 Journal of the Society. Under the term Cambrian System I at 

 present include (in accordance with the original use of the words) 



VOL. III. — part I. L 



