88 FORAMINIFERA OF THE CRAG. 



8. Botalia Beccarii, s. R. 



9. — calcar, m. RC. 



10. Polystomella crispa, m. VC. 



11. Nonionina scapha, m. VR. 



LBNHAM BEDS. — The sands and fossiliferous ironstone found at Lenham, 

 in Kent, were referred by Prof. Prestwich 1 to the Crag. Later writers were inclined 

 to consider the beds as of Eocene age ; but a careful re- examination and comparison 

 of the fossils found in this ferruginous sandstone with those of Diestian age have 

 led Mr. C. Reid to fully endorse the view that they are Pliocene ; and he states/ 

 " As the age of the deposits still seemed very uncertain, it was necessary, for 

 the purpose of this Memoir, to re-examine the ironstones capping the Downs 

 between Folkestone and Maidstone. The result of this examination was thoroughly 

 to confirm Prof. Prestwich' s view of the Pliocene age of the beds near Lenham." 



The sand does not appear to have been examined for Foraminifera, and, as it 

 has been entirely decalcified, it would probably give but a false conception of the 

 protozoan life. The original scope of this Monograph, also, only extended to the 

 consideration of the Foraminifera of the Crag deposits of the Eastern Counties ; 

 but all the English Pliocene beds have been here briefly touched upon to render 

 the work as complete as possible. 



THE NODULE-BEDS. — The nodule-beds have already been referred to in 

 dealing with the sections at Sutton, where the zone a was originally exposed. Owing 

 to the mixed and remanie character of the deposit in the exposures now open, 

 such as Foxhall, no examination has been made for Foraminifera, as the inferences 

 to be drawn from such as might be found, although interesting, might prove mis- 

 leading. 



1 "On the Age of some Sands and Iron-sandstones on the North Downs," ' Quart. Journ. Geol. 

 Soc.,' vol. xiv, 185S, pp. 322-3. 



2 " Pliocene Deposits of Britain," ' Mem. Geol. Surv.,' 1S90, p. 44. 



