388 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 26, 



Fig. 5. 



Southampton Dorchester 

 Town. railway. 



Southampton Common. 

 Artesian well. 



a. BracMesham Bay beds (middle Bagshot sands) 100 feet ? 



1. Green sands — Venericardia planicosta, Turritella sulcifei'a, and teeth and bones of 



fishes, &c. {as at Goldsworthy). (For a fuller list of the organic remains see pages 

 391 and 392.) 



2. Dark clayey sands passing down into yellow clays and sands — Nummulites Icevigatus, 



Sanguinolaria Hollowaysii, Cardium porulosum. (The relative positions of No. 1 

 and 2 is rather uncertain.) 



3. Foliated brown clays. {The thickness and extent of this bed is extremely uncertain.) 



b. Light yellow sands, more or less argillaceous 100 feet? 



{Lower Bagshot sands.) 



c. London clay (upper part of). 



The thickness of the Bracklesham Bay beds has not here been ascertained. An approximate* 

 one is given. The artesian well is about two miles distant from Southampton. For particulars of 

 it see Mr. Keele's paper (Report of the British Association for 1846, p. 52). 



The strata (No. 14. PI. XIV. Comp. Sec. fig. 2) above this division 

 at White-CHif Bay are very indifferently exhibited. They appear to 

 consist of about 1 00 feet of very sandy light brown and yellow clays, 

 with traces of green sands. On the opposite coast of Hampshire are 

 strata apparently the same, but lighter in colour and more sandy.: 

 To these beds succeed 200 to 260 feet of brown and yellow sandy, 

 clays, sands, and impure green sands (Nos. 16 to 19), which are pro- 

 bably the equivalents of the Barton beds ; but all this portion of the 

 section was extremely obscure when I examined it in 1839, and it 

 requires further investigation. It is probable that, although conti- 

 nuous, these 300 to 400 feet of strata, including the Barton beds, 

 become less argillaceous and more sandy as they proceed northward, 

 and they may possibly be represented more or less by the upper divi-, 

 sion of the Bagshot sands. To this we shall refer again. At pre-^ 

 sent we can only approximate to a determination of equivalents in. 

 this last division. This partial uncertainty will not however mate-? 

 rially affect the main argument. 



The comparative sections (PL XIV.) exhibit the presumed range of 

 the Bracklesham Bay series from the Isle of Wight to the neigh- 

 bourhood of London, and show the relative position of the Barton^ 

 series. 



Organic Remains. 



In examining the evidence afforded by the fossils, we will first direct 

 our attention to the fauna alone. The flora will be considered apart. 



The lower division of the Bagshot sands appears marked by its 

 negative evidence ; not a single specimen have I been able to obtain 

 in it either in the Isle of Wight or in the London district. I have 



