PROCEEDINGS 



OF 



THE GEOLOGICAL SOCIETY OF LONDON. 



1827—1828. No. 8. 



May 16. — Decimus Burton, Esq. of Spring Gardens ; and Major 

 T. Perronet Thompson, of the 65th Regiment, were elected Fellows of 

 this Society. 



The reading was begun of a Paper entitled, " On the Old Conglo- 

 merates, and other secondary deposits on the north coasts of Scot- 

 land ;" by the Rev. Adam Sedgwick, Woodwardian Professor, Cam- 

 bridge, V.P.G.S. &c. and R. I. Murchison, Esq. For. Sec. G.S. and 

 F.R.S. 



June 6. — M. H. Ducrotay de Blainville, Member of the Institute 

 of France, and of many other learned and scientific Societies, was 

 elected a Foreign Member of this Society ; and Richard Taylor, Esq. 

 Sec. L.S. of Middleton Square ; Charles Larkin Francis, Esq. of Nine 

 Elms, Surrey j and Jeffry Wyattville, Esq. R.A. of Lower Brook 

 Street, — were elected Fellows of this Society. 



The reading of the Paper of Professor Sedgwick, and R. I. Murchi- 

 son, Esq., begun at the last Meeting, was concluded. 



§ 1. Introduction. — The authors here give a brief sketch of the ge- 

 neral structure of Scotland, to the north of the Forth and the Clyde. 

 They consider the country to be composed of two entirely distinct 

 classes of deposits — primary and secondary} but with the primary de- 

 posits are associated many mountain masses of crystalline rock, which 

 appear to have been protruded since the deposition of the newest of the 

 secondary series ; and hence arises great, and sometimes insuperable, 

 difficulty, in passing from one class of deposits to the other. The low- 

 est of the secondary strata are chiefly composed of red-sandstone 

 and red-conglomerate : and from a general review of this part of the 

 subject, the authors conclude, that the conglomerate system on the 

 N.E. coast of the Highlands is identical with that on the N.W. coast ; 

 and that both the systems are of the same epoch with the great masses 

 of conglomerate which commence at Stonehaven, and range along 

 the southern flank of the Grampian chain. 



§ 2. Range of the old-red-conglomerates through Caithness, and on 

 the shores of the Murray Firth, Sfc. — These rocks are stated to appear 

 in several unconnected masses on the north coast, between Cape 

 Wrath and Port Skerry • and from the latter place they range into 

 the interior, and rise into a mountain chain ( the highest parts reach- 

 ing the elevation of 3500 feet), which is continued to the granite of 

 the Ord of Caithness. Their range parallel to the shores of the Murray 

 Firth, is also given with many details. They are slated to be deve- 



