10 



THE GEOLOGIST. 



question as to its age can hardly remain doubtful, all the authorities 

 agreeing that the fossiliferous ironstone concretions of Furze Hill 

 are unquestionably Lower Greensand. Even, however, were this not 

 the case, I should have no hesitation in comparing the Red-gravel of 

 the Badbury Hill section with the Lower Greensand " Pebble-beds" 

 of the St. Katherino's Hill quarry, near Guildford, so very striking 

 is the resemblance between the two deposits. 



And it is no new idea thus to compare the Tarringdon deposits to 

 the sands and gravels of Devizes, Calne, etc., nor even to the pebble- 

 beds of the L. G. S. of Surrey. In June, 1850, Mr. W. Cunnington 

 called attention to the occurrence of most of the Barringdon Brachio- 

 poda in the Lower Greensand of Seend, near Devizes (Quar. Jour. 

 Geol. Soc. vol. vi. p. 453). Mr. Godwin- Austen repeatedly refers to 

 these deposits as being of similar age (Quar. Jour. Geol. Soc. vol. vi. 

 p. 455 ; and vol. xii. p. 69) ; and Mr. Sharpe himself admits the fact 

 of their accordance to each other. In comparing these deposits, 

 however, it is necessary to distinguish between the two gravel-beds 

 of Barringdon, and this does not appear to have been hitherto done ; 

 for it is the Bed-gravel, containing, as it does, nearly all the Bra- 

 chiopoda which occur in the lower deposit, but very few of the 

 Sponges, that has been met with at Seend, and not the Sponge-gravel ; 

 aud it is the Bed-gravel which accords best with the Lower Green- 

 sand " pebble-beds" of Surrey. 



LIST OP BRACHIOPODA FROM PARKING DON. 







o 



o .J 



<5 bp 



o 



sa 



B> O M 







Is 



£ l» 



o .5 



m a 



as 



bi 



-c.5 



£ a 



<d -a 

 a> a 



t =3 



Oj 



GO 



lis 



05 O 









*i 









g ^ 







3 



"§« 





% o 



O 



■8 a 



CD ;3 



o m 



"S ± -2 ~ 



r°~ 









PS 





Ph 









i 



2 



3 



4 



5 



6 



7 



Lingula truncata, Soiv. . . 



X 











XXX 





Thecidium Wetherellii, Morris 



X 













X 



Terebratclla Menardi, Lain. . 



XXX 



X 



X X 



X 



X 





X 



T. oblonga, Soiv 



X 





X X 



X X 



XXX 





X ? 



Terebratula biplieata, Brocchii 



X ? 











x? 



XXX 



T. sella, Sow 



X ? 











X X 



X ? 



T. toruacensis,m/\, D'Arcliiac 



XX X 



X 



X X 



X 





X 





T. depressa, Lam 



X X 



X 



X 





X ? 



X 





T. Robertoni, D'A'rckiac . 



X 



X ? 



X ? 



X ? 



XXX? 



X ? 





T. tamaritulus, Sow. . . . 



X 



X 







x 







Rhynchonella latissima, Sow. . 



X X 





X 



X 



? 





X X 



it. depressa, Sow 



XXX 



X 



X X 



X 



X 



X ? 



X ? 



R. nuciformis, Sow. . . . 



X X 



XXX 



X X 



X 



X 



p 



X 



R. Gibbsiana, Sow 



X 









X 



X X 





N.B. x Denotes the occurrence of a species as rare. 

 x x As tolerably common, 

 xxx As abundant. 



Although I have formed my conclusions as to the age of the Sponge- 



