170 



Mr. BowERBANK on the London and 



found in the London clay, we were induced to believe that the two formations 

 which had hitherto been considered as distinct, might possibly, by a careful exa- 

 mination, be proved to be only the upper and lower portions of one great deposit. 

 We commenced with a close examination of White Cliff Bay, and found the fol- 

 lowing to be the order of succession of the strata, beginning at the chalk and 

 ending with the lower portion of the freshwater beds : — 



WHITE CLIFF BAY. 



Explanation of letters over the Section. 

 a. Dark greenish sand and clay. e. Yellowish sandy clay. 



b. Red and yellow sands. 



c. Variegated sands. 



d. Greenish grey and brown clay. 



f. Green-coloured sand. 



g. Yellowish sand. 





The numbers of the beds in the following list of strata correspond with the bottom line of figures in the woodcut. 



Paces. 



1. Variegated clay (principally red, corresponding with I and 2 in the Alum Bay section) 45 



2. Dark greenish gray sand, like that at No. 3, Alum Bay section 25 



3. Red and yellow sands 27 



4. Dark greenish gray sand and clay, like those at 3, 4, 5, and 6, of the Alum Bay section 65 



5. Red and yellow sands, like those of Alum Bay 30 



6. Dark greenish gray sand and clay, in which were found Venericardia planicosta, Ceri- 



thia, Sanguinolaria Hollowaysii, and other London clay fossils 30 



7. Variegated sands 6 



8. Dark greenish gray sand and clay , 186 



At the points marked h, numerous small Nummulites, Venus, Valuta, Cerithia, and 

 other London clay shells, were found ; and at h* large Nummulites, like those found at 

 Bracklesham Bay, Sussex ; also Venericardia planicosta and other London clay shells f. 



9. Variegated sands 10 



10. Dark greenish gray sand and clay, like No. 8 45 



11. Variegated sands, like those of Alum Bay 38 



12. Greenish gray and brown clays 13 



At f the clay was greenish brown with lignite. At e it had every appearance of 

 London clay, abounding in numerous characteristic London clay fossils, including 

 Valuta luctatar, Ostrea, and teeth of a Squalus. 



13. Yellowish sandy clay without fossils 26 



14. Greenish sand, similar to that of the Upper Marine in Colwell Bay, and containing 



apparently the same Venus 12 



15. Yellowish sand without fossils 14 



f Since the above passage was written I have visited Bracklesham Bay, on the opposite part of the 

 Sussex coast, and carefully examined the beds in which the above-named shells abound ; and from the 

 perfect coincidence in colour and mineral character of the beds in the two localities, as well as in their 

 zoological contents, I am induced to believe that the relative position of the Bracklesham Bay beds is 

 that point of the series indicated by h* in the White Cliff Bay section. — February 1841. 



