582 Reports and Proceedings. 



The President pointed out that beyond Southend there was a section precisely 

 similar to that of Grays. It was a mistake to suppose that pebbles from the Wealden 

 area did not occur in the Thames gravels. He thought that much of the denudation 

 of the "Wealden area might have taken place before the Glacial period. The presence 

 of Tertiary pebbles in the "Wealden area might readily be accounted for by their 

 presence at the edge of the escarpment, 



Mr, Searles V. Wood, jun., in reply, justified himself for having limited his obser- 

 vations to the northern part of the "Weald, as it was there only that it could be 

 brought into juxtaposition with the Glacial beds. He maintained that, under certain 

 circumstances, no beaches or marine beds were formed at the base of sea-cliffs. He 

 pointed out that in Postglacial gravels large blocks of rock were frequently found, 

 and protested against limiting all ice-transport to the glacial period. He could not 

 recognize the Selsea beds, with 150 living species, some of southern character, and 

 none extinct, as Glacial. He did not acknowledge the alleged softness of the "Wealden 

 rocks, 



Edinbtjkgh G-eologioal Society. — The 37tli Anniversary Meeting 

 of this Society was held in its apartments, 5, St. Andrew Square, on 

 the 3rd November, 1870. Mr. Panton read the Eeport on the state 

 of the affairs of the Society for the past session, and Mr. Eichardson 

 submitted the Eeport of the Delegates from the Society to the Sep- 

 tember Meeting at Liverpool of the British Association. Both 

 Eeports were approved of. The following gentlemen were appointed 

 officers for session 1870-71 : — Patron, Sir Eoderick I, Murchison, 

 Bart, ; President, Archibald Geikie, F.E,S, ; Vice-Presidents, H. 

 AUeyne Nicholson, M.D., M.A,, James Haswell, M,A, ; Honorary 

 Secretary, George A, Panton, Birkhill, Hope Terrace; Treasurer, 

 George Lyon ; Librarian, Ealph Eichardson, W,S. ; Curator of 

 Museum, Alexander Somervail ; Councillors, Eight Hon. Lord Eose- 

 hill, James Gowans of Gowanbank, John Eussel, Lord Dean of 

 Guild, E. M, Smith, F.E.S.E,, William Drummond, S.S.C, James H. 

 Sanderson, Goldsmith. 



November 17th, 1870. At the first ordinary meeting of the 

 session held this evening, the following paper was read : — " On the 

 Correlation of the Silurian Eocks of the North of England with 

 those of the South of Scotland." By H. Alleyne Nicholson, M.D,, 

 D,Sc., F.E.S.E., etc. 



In this communication, the author gave a general view of the sub- 

 divisions of the Silurian Eocks of the North of England, and of the 

 Southern Highlands of Scotland, with a view of showing how far 

 the two series were comparable with one another. The Silurian 

 Eocks of the North of England were shown to consist of the fol- 

 lowing members : — 1. Skiddaw Slates (=: Quebec group of Canada, 

 and base of the Lower Llandeilo of Wales). 2. Borrowdale Series 

 or Green Slates and Porphyries (= Lower Caradoc), 3, Coniston 

 Limestone (=Bala Limestone). 4. Graptolitic Mudstones (Upper 

 Caradoc). 5. Coniston Flags (= Denbighshire Flags, ?). 6. Conis- 

 ton Grits (Lower Ludlow). 7. Kendal Eocks (Ludlow). The 

 sequence of the Silurian Eocks in the South of Scotland was more 

 obscure, but by the researches of Murchison, Nicol, Geikie, Hark- 

 ness, and others, amongst whom Mr. Lapworth, of Galashiels, de- 

 served a most honourable mention, it was now possible to form some 

 clear idea as to the general groxiping of these rocks, Probably the 



