[ 353 ] 



XL. Some Remarks upon the Crag Formation of Norfolk and 

 Suffolk. By Samuel Woodward, Esq. 



To the Editors of the Philosophical Magazine and Journal. 

 Gentlemen, 

 "DERMIT me, through the medium of your Journal, to 

 *■ offer a few remarks on a paper by Mr. Charlesworth in- 

 serted in your Number for August, p. 8 J . 



Feeling a kindred spirit with Mr. Charlesworth in bringing 

 these interesting deposits into notice, and moreover a desire 

 that truth should prevail, I do, in the true spirit of scientific 

 inquiry, state that my views of the subject do not square with 

 those of that gentleman. 



In the first place, his red crag is decidedly diluvium or dis- 

 rupted crag, with an admixture of the oxide of iron, pre- 

 cisely similar to what we witness in the gravel of Norfolk. 

 We have also in this county immense beds of transported 

 crag shells, in the cliffs south and north of Yarmouth, and 

 at Cromer, but with this difference, — they are imbedded in 

 sand*. 



Secondly, his term 'coralline crag' is not appropriate, as it 

 leads us to suppose that it is composed of corallines, when, in 

 fact, there are none in the Ramsholt bed, which is chiefly 

 adverted tof. Mr. Charlesworth has not mentioned the great 

 coral-reef situate about three quarters of a mile north of Aid- 

 borough, which contains (as far as I have observed) neither 

 univalves nor bivalves, except a few Pectens. I think he must 

 have had this locality in his mind's eye, and thus been led to 

 the misnomer^. 



At the close of the prefatory remarks to my Outline of the 

 Geology of Norfolk, I stated, on the authority of a friend, that 

 there was a bed of shells at Ramsholt analogous to those of 

 the calcaire grossier of Paris. I subsequently visited this lo- 

 cality, and found that the bed in question was what might be 

 termed undisturbed crag, and the superincumbent bed was 



[* Mr.Woodward appears to us to have overlooked the great difference 

 between the organic remains of the red and coralline crag, as shown by 

 Mr. Charlesworth. — Edit.] 



[f We apprehend that this designation as applied to the lower crag by 

 Mr. Charlesworth, refers merely to its being characterized by an abundance 

 of corals, having no reference to the bodies termed corallines. It is exactly 

 analogous to the appellation " coralline oolite" already established in geo- 

 logy.— Edit.] 



[J The coralline crag of Aldborough is expressly referred to by Mr. 

 Charlesworth, p. 86. — Edit.] 



Third Series. Vol. 7. No. 41. Nov. 1835. 2 Z 



