﻿398 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



outlier as that of Patching before described (p. 372). It has ap- 

 peared to me desirable to explain the general relations of the drift to 

 the chalk and older tertiary deposits in situ at this western end of 

 Brighton, and to illustrate them by the accompanying woodcut, 

 fig. 12. 



I have only to add that I have just received, together with the 

 revise of this postscript, a copy of a memoir, by Mr. Martin of Pul- 

 borough, on the "Anticlinal Line of the London and Hampshire 

 Basins," recently published in the Philosophical Magazine, 4 Ser. 

 vol. ii. 1851, in which I rejoice that his paper on the <f Probable Con- 

 nexion of the Eastern and Western Chalk Denudations," to which 

 I have adverted as having been mislaid at the Geological Society, 

 has at length been printed. I much regret not to have had access 

 to a production, so pregnant with original observations on the anti- 

 clinal and synclinal lines of the South of England, and which would 

 have enabled me to" enforce more cogently some of the arguments I 

 have endeavoured to advance. The reader who may collate my de- 

 ductions concerning the drift with those of Mr. Martin will see, that 

 whilst I agree with him in the manifest proofs of violence in the 

 dislocation of the rocks and the sudden and tumultuous translation of 

 a large portion of their debris, I am not of his opinion that the denu- 

 dation of the Wealden and of its flanking ridges was the result of one 

 grand operation only. I have to express my regret, that I should have 

 been unaware of Mr. Martin's previous description of the outlier of 

 •tertiary clay and pebbles at Highdown Hill, Patching (Phil. Mag. 4 S. 

 vol. ii. p. 191), which I have described above, p. 372; but I entirely 

 adhere to the view first taken by Dr. Mantell, that the waterworn and 

 rounded shingle under the drift at Brighton is of the modern age he 

 assigned to it, and that it cannot be assimilated to the remnants of 

 the older tertiary pebble beds which have been left here and there 

 upon the surface of the Chalk Hills. 



