4i6 



CRETACEOUS. 



specimens, one of which was at least four feet in diameter. In the Margate Chalk 

 Avimoniies leptophylhis occurs, nearly three feet in diameter. ^ The Margate Chalk 

 does not belong to so high a zone as the Norwich Chalk ; indeed, as Mr. Whitaker 

 has remarked, there is probably no representative of the uppermost English Chalk 

 in East Kent.^ 



The paJajontological zones first indicated by Prof E. Hebert have been worked 

 out in detail by Mr. F. G. H. Price ^ and Mr. W. Hill.* (See p. 403.) 



At the base of the Chalk Marl near Folkestone there is a dark sandy marl, 

 fourteen feet thick, which is noted by Mr. Price as the zone of the Sponge 

 Staiiroiiei)ia Carteri : this bed has usually been regarded as Upper Greensand, but 

 sometimes it has been termed Chloritic Marl. It is bareiy recognizable between 

 Folkestone and Guildford, but has a thickness of thirty feet at Eastbourne. 

 (See p. 388.) Coprolites have been observed at the base of the Chalk at Aylesford. 

 The Channel Tunnel was commenced in the Chalk at Shakespere's Cliff.^ 



Eastbourne is situated on the lower part of the Chalk. In this 

 neighbourhood it has been divided as follows by Mr. F. G. H. 

 Price :" — 



Top beds not measured. (See Fig. 66.) Feet. 



/•Soft yellowish bed with Iiwceramus mytiloides, Terebrahdina 



Middle J gracilis 1 20 



Chalk. I Hard gritty chalk, with comminuted fragments of Inoceramiis, 



^ etc., Cardiaster pygnuiiis, [Melbourn Rock.] 8 



J ^ . Belemnite-zone 8 



Chalk I Lower or grey chalk. Zone. o{ Holai/er subglobostis 1 70 



^' ( Hard coarse grey marl, with Plocoscyphia niaandrina 30 



The neighbourhood of Lewes is, through the labours of Dr. G. A. Mantel], a 

 well-known locality for Chalk-fossils. Here, in 1832, he discovered theHippurite 

 RadioUtcs IMoretLmi. There are pits at Hamsey, Offham, Southeram ; and further 

 west at Steyning, Burpham, Arundel and Brighton.'' Chalk is seen on the coast 

 at Worthing and Littlehampton, and at these localities and at Brighton, flint- 

 p)ebbles containing chalcedonic sponges, mostly Siplioiiia {CJioaniles) Koenigi, are 

 picked up on the beacli and polished as Brighton pebbles. 



West of Littlehampton, Chalk has been exposed on the shore opposite Felpham, 

 while at Middleton Chalk has been dug at low-water. ^ 



HAMPSHIRE, ETC. 



The Chloritic Marl occurs in the neighbourhood of Alton and 

 Selborne, where it is from a few inches to fifteen feet thick. It 

 contains a good deal of phosphatic matter, and the beds have been 

 largely worked at Froyle. The celebrated ' coprolite' beds found 

 near Farnham in Surrey, and worked at Dippen Hall, vary in thick- 



^ G. Mag. 1874, p. 16; P. Geol. Assoc, iii. 217. 



^ Q. J. xxi. 396. See also Geol. Norwich (Geol. Survey), p. 20. 



3 Q.J. xxxiii. 433. 



* Q. J. xhi. 232. ^ 



^ De Ranee, P. Geol. Assoc, vii. 339 ; see also Prestwich, Proc. Inst. Civ. Eng. 

 xxxvii., and Topley, Quart. Journ. Science, 1872. 



^ Dixon, Geol Sussex, ed. 2, p. 137. 



' Mantell, Day's Ramble in Lewes, 1846; see also J. Howell, P. Geol. Assoc. 

 ii. 168, V. 80. 



® Woodbine Parish, Proc. G. S. ii. 114. 



