180 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [NoV. 30, 



meridge clay : none were observed from the Portland stone, which 

 had been denuded from this neighbourhood before the deposit of the 

 Gault ; some fragments may have been derived from the middle 

 oolites, but they are hardly in a condition to be determined. 



The following is a list of the oolitic fossils detected in the gravel of 

 Little Coxwell : — 



Exogyra nana, of the Coral rag and Kimmeridge clay. 



Gryphaea virgula, of the Kimmeridge clay. 



Ostraea deltoidea, of the Kimmeridge clay. 



Pecten vimineus, of the Coral rag. 



Belemnites, two or more species, much worn. 



Ammonites, fragments of many species. 



Cidaris coronata, of the Coral rag. 



Diadema. 



Sphajrodus gigas, of the Kimmeridge clay. 



Ichthyosaurus ; teeth and vertebrae. 



Crocodile; teeth. 

 Of the above list, the specimens of Exogyra nana and Gryphcea 

 virgula are nearly in the same mineral condition as the shells which 

 are supposed to belong properly to the deposit, being little worn, of 

 a yellowish colour, and not filled up vdth stone ; nevertheless I re- 

 gard them as strangers brought in the fossil state to the locality. All 

 the others differ in condition from the native species of the deposit. 



At the end of this paper will be found a list of all the species yet 

 identified, which are thought to belong to the Sponge-gravels, with 

 an indication of the beds in which they have been observed elsewhere ; 



the general results of which are shown in 



the following 



table :— 



- 





6C 



a 

 o 

 c 

 to 



i 



o 



4 



o 

 c 

 o 



Is 

 ".5 



i 



i 



i 



o 

 c 

 IS 



■a 



■3 

 1 



Species peculiar to the deposit 



•1 



2 

 1 



L' 

 11 



1 

 3 



20 

 2 



17 

 1 

 4 



1? 



4 

 3 

 3 

 11 

 1.' 

 2 



3 

 3 

 5 

 2 

 8 

 2 

 3 



4 

 3 



1 



3 



4 

 3 



1 

 1 



14 

 12 



32 



12 



50 



5 



13 



1 



Maestricht sands 



Upper chalk 



Lower chalk 



Upper greeu sand, including Tourtia 



Gault 



Lower green sand 





Total number of species examined 



16 



44 



19 18 



7 



7 



111 j 









The number of species occurring in more than one formation is 

 shown by the following table : — 



Common to Maestricht sand and chalk ...| ... 

 Common to Maestricht sand and Upperl 



green sand 2 



Common to Clialk and Upper green sand. . . I 1 

 Common to Upper green sand and Gault.j 



or Lower green sand I ... 



.. 



3 



2 







5 



1 



1 



2 

 1 



2 

 2 



... 



3 



7 

 8 



1 



1 



2 



... 



1 



5 



