1849.] 



PRESTWICH ON THE CRAG AT CHILLESFORD. 



345 



March 7, 1849. 



E. T. Ravenshaw, Esq., and Henry T. Slack, Esq., were elected 

 Fellows of the Society. 



The following papers were then read : — 



I. On some Fossiliferous Beds overlying the Red Crag at Chilles- 

 FORD, near Orford, Suffolk. By Joseph Prestwich, Jun., 

 Esq., F.G.S. 



Outline map of the district, showing the bearings of the principal places 

 mentioned in the paper. 



A. Aldborough church. 



B. Butley church. 



C. Chillesford church. 

 I. I ken church. 



O. Orford church. 

 S. Sudbourn church. 

 T. Tunstall church. 



c. Chillesford brickfield. 



I. Iken brickfield. 



s. h. Sudbourn-hall. 



R. A. River Aide— ferry at "/." 



B. R. The Butley River. 



.... Line of section "fig. 3.*' 



Scale 1 inch = 3 miles. 



This paper is the result of a short excursion in the Crag district in 

 company with Mr. R. C. Austen, Mr. J. Morris and Mr. A. Tylor, 

 jointly with whom the following observations were made. 



One of the objects which we had in view was to ascertain whether 

 the distinction of age introduced upon palseontological grounds, be- 

 tween the crags of Norfolk and Suffolk, could be confirmed by visible 

 superposition. With regard to the red and coralline crags of the 

 latter county, their direct and distinct superposition had been satis- 

 factorily proved both by Mr. Charlesworth and by Sir Charles Lyell 

 on the evidence of several sections, whilst on the evidence of its fossils 

 the mammaliferous crag of Norfolk has been assigned by them to a 

 higher geological position than the red and coralline crags ; but no direct 

 superposition of the mammaliferous on the red and coralline crags had 

 been detected, nor had these deposits been found developed together 

 in the same district. This circumstance, combined with the fact of 



