1861.] 



FISHER BRACKXESHAM BEDS. 



89 



Cytherea suberycinoides (oom- 

 mon). 



lucida. 



— — ? trigonula. 



Solen (long and narrow). 



Panopaea. 



Modiola. 



ft. 



2. Band of flint-pebbles, engaged in the base of the last 



bed. They have become white and friable 6 



1. White siliceous sand ; the bottom is not seen 6 



The list of fossils from No. 4 agrees well with its assigned position 

 in the Bracklesham series ; while I have seen no species in No. 5 to 

 bring it within that category. Moreover there is every indication of 

 No. 4 having formed the bottom of the sea for a long period, during 

 which the sediment, small in quantity, differed from that which after- 

 wards constituted bed No. 5. Erom these two considerations, it may 

 appear admissible to place the line of division where nature seems 

 to have placed it, viz. above the pebble-bed ; and I have endeavoured 

 to place it in the corresponding point at Alum Bay. This pebble- 

 bed, which is strictly a fossil-bed, seems to be contemporary with 

 No. 6 at Alum Bay, and is probably a shallower condition of the 

 Hunting Bridge Bed. There are two species, not usually at all 

 abundant in the other beds of the series, which appear rather 

 common at Hunting Bridge and in these highest Bracklesham beds 

 at Alum Bay and High Cliff; they are Fusus carinella and Tellina 

 Branderi, var. 



JFigs. 3 and 4. — Comparative Sections of the Strata at Alum Bay and 

 High Cliff, Scale Jth of an inch to a foot. 



Fig. ^.—Alum Bay. Fig. 4:.— High Cliff. 



Barton J 

 series, "i 



Brackle . 

 sham -^ 

 series. 



Nummulina Prestwichiana bed 

 Grey clay. 



Barton 



series. 



Dark sandy clay, with 

 small bivalves. 



Dark sandy clay. 



Fossils in the state of casts. Brackle- 

 Dark sandy clay. series. 



Septariaof ironstone (tab.). 

 Fossils in the state of casts. 



Kummulina Prestwichiana. 

 Indurated brownish-grey 



clay, mottled with green. 

 Coarse, green, sandy clay. 

 Pebbles and casts of fossils. 



Casts of fossils in brown 

 sand. 



•'=- Septaria of ironstone (tabu- 

 lar). 



i5f*%n 



Dark sandy clay. 



Pebble-bed. 

 Coloured, sands. 



^ Pebbles. 



White sand. 



Present beach. 



A comparison of the sections near the junctions at Alum Bay and 

 High Cliff will render the correlation of the beds at those places clear. 

 It appears that all the strata in this part of the series are thicker 

 at Alum Bay than at High Cliff. The Nummulina Prestwichiana 

 Bed may be taken as a safe horizon at the two localities. Seeing 



