Ivi PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Grreenough, who not only presented to this Society the plates of 

 his map, but bequeathed to us a large sum of money, that we 

 have been enabled, by a judicious application of a portion of 

 that money, to produce the present result. But it must also 

 not be forgotten that this I'esiilt cotild not have been obtained 

 without the active labours of the Committee appointed by the 

 Council for this purpose, the members of which have for many 

 years devoted much of their time and energies to its completion. 

 'Nov can I refrain, on this occasion, from mentioning the names of 

 those members of the Committee who have been most active in 

 communicating the results of their previous labours and investi- 

 gations. At the same time you will understand that a very 

 large proportion of the improvements and corrections which 

 have been introduced into this edition, particularly in Wales and 

 some of the Western and Central counties of England, is taken 

 from the published documents of the G^eological Sui'vey, which, 

 as far as they have been completed, have served as the basis of the 

 new edition. 



The most active private contributors to this work have been 

 Sir Roderick Murchison, Professor Phillips, Mr. Prestwich, and 

 Mr. Godwin- Austen. The corrections of Sir E. Murchison refer 

 principally to the Vale of the Eden and St. Bees Head in Cum- 

 berland, where, with the assistance of Professor Harkness, he has 

 shown that a considerable portion of the Eed Sandstone series, 

 which had hitherto been coloured as belonging to the lower 

 portion of the Trias, is in fact the upper portion of the Permian 

 system, with which it is most intimately connected. He has also 

 shown, with the aid of Professor Harkness, that the Skiddaw 

 Slates, the oldest rocks of Cumberland, are not of such high 

 antiquity as has hitherto been assigned to them, but that they 

 belong to the Lower Llandeilo pei-iod. 



Professor Phillips's share consisted of a careful revision of the 

 six northern counties, and a considerable portion of the N.E. of 

 England, extending from Nottingham to Lincoln, through his 

 already published area of Yorkshire into Durham and the grea,ter 

 part of Northumberland, in which he obtained the assistance of 

 Mr. Tate of Alnwick. He likewise furnished the data for Nortli 

 Lancashire, Westmoreland, and Cumberland, and, with the aid of 

 Mr. Binney, for South Lancashire and Cheshire, and the Lias of 

 the plain of Carlisle, His residence at Oxford also enabled him 

 to give some useful assistance in that neighbourhood. 



Mr. J. Prestwich has supplied the geological data for the Ter- 

 tiaries round London and Kent, and the Bagshot series in Surrey 

 and part of Berkshire, from his own MS. notes on the 1-inch 

 Ordnance Majis, at which he had worked from 1835 to 1855. 

 Erom the Newbury district to the Isle of Thanet and Harwich, 

 the new map adopts Mr. Prestwich's divisions and outlines as far 

 as could be done with the imperfect topography of the original 

 plates. Mr. Prestwich also undertook to put in the Chalk, Crag, 

 and Drift areas in Norfolk and Suffolk, and adopted the division 



