FITTON's section at ATHERFIELD. 



% 



Summary/ of the Distribution of the Fossils. 



321 



Number of species first appearing. 



i 



S3 



i 



^1 





PI 



Tn N^n fiii tn 4fi nnpliisivp^ 



feet. 



242 



20 



390 



83 

 60 



6 





 5 



13 



48 

 6 



r32 



148 



]8 

 130 



2 



33 



39 



45 

 5 



171 

 7/ 



In No. 45, "Ferraginous bands" 



From No. 44, " Walpen Sands," 1 

 to No. 11, "Lower Gryphsea" (inclusive) J 



Total from No. 55 to No. 11 (inclusive) = 65 2 ft. 



From No. 10 to No. 4, the " Crackers" 



In No 3 ** Atherfield Clav" alone 



In the Perna group j^^; H 



Total number of species froml lAQfi. 

 No. 10 to the bottom of No. 1 J " ^^^ "' 



Total thickness (about) 



801 









Total number of species 







148 



148 





Range and relative Frequency^ or Number of Places in the series of 

 Strata in which the Species have been found. 



S to 



1 

 1 



2 



1 



1 



1 



9 

 15 

 37 

 50t 



146 



Names of species. 



(Gryphaea sinuata) 



(Panopsea plicata) 



Thetis minor, Corbula striatula 



(Pinna Robinaldina) 



(Ammonites Deshayesii) 



Terebratula sella 



Species occur in four places only 



In three places only 



Twice only 



Species occur only once in the series of strata.. 



ill 



Range in 

 the strata. 



18 



1—37 



17 



1—455 



15 



1—456 



12 



3—455 



11 



1— 35a 



10 



1—455 



4 





3 





2 





1 





It will be found that 130 species, or about f ths of the whole num- 

 ber, make their appearance in the lowest groups, from Nos. 1 to 10, 

 within a thickness of about 150 feet ; so that 18 species only originate 

 in the remaining 650 feet above ; and this predominance of the lower 

 part would be still more remarkable, if the table could have exhibited 

 the proportionate thickness of the strata ; — the lowest or Perna group 



t Of these 50 species, 20 occur in Nos. 1 and 2, — 2 in No. 3,- 

 10,-10 in Nos. 13 to 45. 



■18 in Nos. 4 to 



