320 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Table of Fossils. 



The most striking facts appearing on the face of the table, are the 

 extraordinary accumulation of species in the lower part, and the rapid 

 diminution in their number in the middle and upper strata ; till at 

 last a thickness of more than 200 feet at the top of the section here 

 is almost destitute of fossils, — an extreme exhaustion, however, which 

 appears to be confined to this part of the coast. 



The thickness of the entire section is about 800 feet ; the total 

 number of species found in the strata about 150. 



The following is a condensed view of some of the numerical results 

 derivable from the table : — 



Distribution of the Species. 



Groups, 



XVI. 

 XV. 



XIV. 



XIII. 



XII. 



XI. 



X. 



IX. 



VIII. 



VII. 



VI. 



V. 



IV. 



O cj 



55-49 



48—46 



45 «* c 



44—41 



40 

 39—38 

 37—36 



35 

 34—26 

 25—24 

 23—17 

 16—14 

 13—11 



List of strata. 



Various sands 

 Upper clays .. 



Ferruginous bands 



Walpen sands and undercliff 



Foliated clay 



Cliff-End concretional beds 



Second Gryphaea 



Walpen and Ladder sands 



Second Crioceras 



Walpen and Ladder clays and sand. 



Lower Crioceras 



Scaphites 



Lower Gryphsea 



Thickness, Nos. 44 to 11. 



Fossil 

 contents of 

 the strata. 



•S S 



CO w 



34 



Approximate 

 thickness. 



Feet. 



126 

 118 



19 



Feet. 



245 



19 



389 9 



III. 

 II. 



10—4 

 3 



2—1 



The " Crackers " 



Atherfield clay 



„ fNo. 2—321 



Pernagroupj^^ j_44|, 



Thickness, Nos. 10 to 1. 

 Total No. of Species. 



148 



148 



Total thickness 802 



