256 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 23, 



clay of HampsMre \ritli that of the London district, I had occasion 

 to allude frequently to this basement bed in the Isle of Wight and 

 in the western part of the London district. In addition to the sections 

 of the central and eastern area of the London tertiaries, which did 

 not then come under notice, I pm-pose gi^'ing a few of the leading 

 sections I then alluded to in more detail than I could in a paper 

 which embraced a wider subject, and to which this point was only 

 secondaiy. 



I will take separately the sections and lists of the organic remains 

 at each locahty, and afterwards endeavour to show their co-relation*. 



To resume m the Isle of \M2;ht with the interesting section of this 

 bed at White Cliff Bay. (See fig. 1.) 



Fig. \.— Section of a part of White ClifBay. 



b . London clay ; dark brown and grey clay ; in de- 

 scending becomes mixed ^ith green sand. Fossils 

 scarce. 



, Tabular septaria, with numerous fossUs. 

 2. IMised clay and green sand, like 4. 3. Dark 

 green sand, "full of the Ditrupa playia. 4. 

 Brown sandy clay, much mixed with green 

 sand, and passing downwards into a conglo- 

 merate with round flint pebbles, and partly 

 rounded pebbles of chalk and red clay. Con- 

 tains a few Ditrupa plana. 3 to 4 feet. 



>c.< 



Ostrea, a large undetermined species. 

 Pectunculus brevirostris, Sow. 

 Pyrula tricostata, Desk. 

 Rostellaria Sowerbyi, Mant. 

 Teeth of Lamnaef. 



Mottled clays — dark red (upper part of) . 



The occurrence of pebbles of the underhung mottled red clay m 

 the lower part of the basement of the London clay " c " is a fact here 

 to be particularly noticed. 



The organic remains found in this bed are as under : — 



Cardium Plumsteadiense, Sow. 

 Corbula, a finely striated species. 

 Cytherea obliqua, Desk. 

 Ditrupa plana, Sow. sp. 

 Natica glaucinoides, Sow. 

 Traces of carbonized yegetables and 

 wood. 



Passing over to the northern part of the Hampshire tertiary di- 

 strict, the only good section of this bed that I am acquainted with 

 was exposed in a cutting on the Railway at Clarendon Hill, three miles 

 E.S.E. of Sahsbuiy. (See fig. 2.) 



* For an outline map of the tertiary strata, see Quart. Joum. Geol. Soc. vol. iii. 

 pi. xiv. 



t I have omitted the name of the species, as I feel in doubt as to which of 

 Agassiz's species to refer it. It probably is the L. elegans, or there may be more 

 than one species. The same species accompany tliis bed throughout its entire 

 range. 



