604 MESSES. GAEDJfEE, XEEPI3s"&, A^D ITOlfCKTON OX THE 



arrived at subsequently by two of us under less favourable con- 

 ditions, and wbich we found to differ. The total is within a very 

 few feet of that arrived at by Prestwich in 1846 and 1857. We 

 have further grouped and correlated the beds with the three divi- 

 sions seen in our typical section (fig. 2, facing p. 594). 



Sectio:n- at Whiiecliff Bat (fig. 8). 



ft. in. 

 Lower Headon Lower Headon 29 



r 



I Buff sand, with darker clayey beds towards base 206 

 Upper Barton j Bluish sandy clay, with Chama squamosa, Tere- 



Blue sandy clays, with mottled-brown patches 

 of soft earthy ironstone and ironstone band 



■\lf'AA^ T3 f J 3 feet thick at base 38 



Middle Barton -j Greyish-blue clays, with fawn-coloured bands 



I near base 36 



\^ Stiff laminated clay, with few, if any, fossils ... 18 



(Blue and yellow sandy clays, with few badly 

 preserved fossils 54 

 Dark green glauconitic sandy clays, crowded 

 with NummuUtes elegans, var. Prestwickiana 1 1 



Total 368 1 



/'Coarse earthy sand, with Ostrea plicata 7 



I Dark green glauconitic sandy clays 70 



Upper j Ditto, crowded with Nuramulites elegans, var. 



Bracklesham ] variolaria 20 



I Grrey sandstone or "7>/?mfl-bed" of Selsey 5 



\^ Brook Bed 



It will be seen that the Upper Bartons have enormously thickened 

 since we last saw them at Alum Bay ; but it is by no means certain 

 that they are so uniform in character as they appear. The buff 

 colour is probably greatly due to weathering, as these beds assume a 

 precisely similar appearance when exposed for any length of time in 

 the Barton section. By digging some distance in, the more or less 

 clayey nature and darker colour of some of the beds become 

 revealed, but no clean siliceous sands appear. At 66 feet from the 

 top we found casts of Cardita ohlonga and Cytherea *. The junction 

 between this and the (Jhama-hedi cannot be made out clearly in the 

 cliff without digging to some depth ; but it is very distinct at low 

 water when the beds are visible. Still the C/mma-bed is less 

 sharply separated than at Highcliff, and the matrix is darker and 

 more clayey and the Chamas far less abundant. The fossils col- 

 lected from it were as follows : — 



* Prof. Judd (Q. J. G. S. vol. xxxvi. (1880) p. 171) believes that they represent 

 the Lower Headon. Prof. Forbes also found an abundance of impressions of 

 marine shells which he considered might be Barton species. 



