452 



PEOCEEDINGS 



OF 



THE GEOLOGICAL SOCIETY. 



POSTPONED PAPEES. 



1. On the Structure of the Crag-beds of Sttpeolb: and NoRPOiKj 

 with some OssEEYATioifs on their Organic Eemains. By Joseph 

 Prestwich, Esq., F.E..S., &c., President. Part III. — The Nor- 

 wich Crag and Westleton Beds. 



(Eead January 26, 1870*.) 



[Plate XX.] 



In the first and second parts of this paper f I described the 

 structure of the Coralline and Hed Crags, and discussed the con- 

 ditions under which they were formed. It now remains to describe 

 the structure of the Crag series in Norfolk, and determine the 

 correlation of the two geographical series. 



The order of succession in the Suffolk area is clear and defined ; 

 but the relation which the Crag-beds of that area bear to those of 

 the same series in Norfolk does not admit of the same ready deter- 

 mination. The Norfolk beds themselves, in their several localities, 

 have been described by Mr. R. C. Taylor J, Mr. S. Woodward §, Mr. 

 Charlesworth ||, Sir Charles LyeU ^, and Mr. Trimmer**; and more 

 recently a good brief account of them has been given by the Rev. 

 J. Gunnft ; whilst various papers, by Mr. Searles "Wood §§, Mr. S. 



* For the discussion on this paper see Quart. Journ. G-eol. Soc. vol. xxvi. p. 282. 



t Ante pp. 115 & 325. 



j " On the Crag-strata at Bramertoii," Trans. Geol. Soc. 2nd series, vol. i. 

 p. 371, 1826. 



§ Outlines of the Geology of Norfolk, 1833. 



II " On the Crag," Lend. & Edinb. Phil. Mag. 1835-36 ; and Ann. Nat. 

 Hist. vol. ix. 



^ "On the Eelative Ages of the Crags of Norfolk and Suffolk," Mag. Nat. 

 Hist. vol. iii. 1839; and "On the Tertiary Strata of Belgium" &c., Quart. 

 Journ. Geol. Soc. vol. viii. p. 277. 



*- " On the Cliffs of Norfolk,"' Quart. Journ. Geol. Soc. vol. i. p. 218, and 

 vol. vii. p. 19. 



tt Sketch of the Geology of Norfolk, 1864. 



§§ " On the Extraneous Fossils of the Eed Crag," Quart. Journ. Geol. Soc. 

 vol. XV. p. 32 ; and " On the Structure of the Eed Crag," Quart. Journ. Geol. 

 Bog. vol. xxii. p. 5.38. 



