﻿IxXViii PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [MaV I908, 



Since the pioneer- work of these two illustrious men, the 

 Cambrian and Silurian rocks of the British Isles have been 

 sedulously studied by many enthusiastic and competent observers, 

 and their palaeontology has been developed in far greater detail than 

 the founders of the two systems ever dreamt of. In particular the 

 system of zonal subdivision, originally employed in the elucidation of 

 the Jurassic formations, has been applied with much success to our 

 most ancient fossiliferous deposits, which have now been classified 

 on a biological basis, in such manner as to become more than ever 

 types for the investigation of the older Palaeozoic rocks of other 

 countries. The Geological Society may point with justifiable pride 

 to the large proportion which it has published of the results of 

 the stratigraphical and palaeontological investigation of the older 

 Palaeozoic rocks of the British Isles. 



In Wales the Cambrian and Silurian rocks were studied by 

 Salter and Hicks, who have been followed, in ever-increasing 

 minuteness of detail, by a long succession of observers, including 

 Messrs. Marr,^ W. Keeping,^ Lake,^ Groom,^ Cowper Reed,^ Reynolds,^ 

 D. C. Evans,"^ C. Lloyd Morgan,^ and H. Lapworth.^ 



Our knowledge of the Lower and Upper Silurian rocks of the 

 Lake District has been enlarged and improved by the papers of 

 the late Prof. Mcholson and Dr. Marr,^° which were communicated 

 to the Society. The Silurian Uplands of the South of Scotland, 

 which so long refused to reveal their internal structure, have had 

 their secret extracted from them by Prof. Lapworth, whose papers 

 on the subject in the Quarterly Journal ^^ have been the stimulus 

 and guide for all subsequent correlations of the stratigraphical sub- 

 divisions of that region with the corresponding formations elsewhere 

 at home and abroad. In the far iS'orth-West of Scotland the pioneer 

 work of Charles Peach, llurchison, and Salter among the Durness 

 Limestones has been ably extended and completed by the Geological 



^ Q. J. xxxiv (1878) 871 & xli (1885) 476. 



2 Q. J. xxxvii (1881) 141. 



^ Q. J. xlix (1893) 426 ; li (1895) 9; Hi (1896) 511. 



■1 Q. J. xlix (1893) 426, & vols. Iv, Ivi, Ivii, & Iviii (1899-1902). 



' Q. J. li (1895) 149. 



6 Q. J. lii (1896) 511 & Mi (1901) 267. 



■^ Q. J. Ixii (1906) 597. 



« Q. J. Ivii (1901) 267. 



9 Q. J. Ivi (1900) 67. 



^0 Q. J. xhv (1888) 654 & xlvii (1891) 500. 

 11 Q. J. xxxiv (1878) 240 & xxxviii (1882) 537. 



