TIPPER EOCENE (bARTON AND FPPER BAGSHOT FORMATIONS). 603 



when he described the section *, 

 but are given as "Headon-Hill 

 Sands," 202 feet ; 37 feet of 

 laminated clayey sand ; 44 feet of 

 bright yellow sand ; 1 62 feet of 

 imperfectly exhibited brown and 

 grey clays, &c. ; 32 feet of fossili- 

 f erous brown clay resting on 4 feet 

 of sandstone. The latter is placed 

 in the Bracklesham by Fisher, 

 and the junction somewhere in 

 the 1 62 feet of clays (Quart. Journ. 

 Geol. Soc. vol. xviii. (1861) p. 68). 

 The artificial nature of the divi- 

 ding line is shown by the fact 

 that no observer previous to 

 Fisher had ever thought of divi- 

 ding up the almost homogeneous 

 mass of fossiliferous clay which 

 is now classified as 93 feet of 

 Bracklesham Beds and 60 feet 

 of Bartons. 



Whilst preparing this commu- 

 nication, one of us visited White- 

 cliff Bay and found the Barton 

 Series exposed between tide- 

 levels in an unusual, if not an 

 unprecedented, manner. The 

 section was measured, and the 

 corresponding beds subsequently 

 exposed by digging at the base 

 of the cliff, when the first mea- 

 surements were checked off. 

 The result was published in the 

 Geological Magazine f. It must 

 be remembered that the section 

 is not quite at right angles to 

 the outcrop, and a diagonal 

 direction may somewhat exag- 

 gerate the thickness. The mea- 

 surements are for the most part 

 reproduced from the work cited, 

 as we believe them to be more 

 accurate in the case of the 

 Barton Beds proper than those 



* Quar^. Joum. Geol. Soc. vol. ii. 

 p. 224. The Barton series is com- 

 prised in beds 17-20. 



t " On the Discovery of the Num- 

 viuUna-elegans zone at WhiteclifF Bay, 

 by H. Keeping," Geol. Mag. Decade 

 iii. vol. iv. p. 70. 



