492 



ME, A. STKAHAK ON THE LINCOLNSHIRE CAESTONE. 



indicates that it should be separated from the Speeton Series as a 

 distinct and probably unconformable subdivision. The classification 

 that has been adopted for the map (fig. 2) is shown in the expla- 

 nation of the Sections. 



If this correlation is correct, it follows that the Neocomian rocks 

 of Bedfordshire and of the eastern counties generally are later than 

 the whole of the ISTeocomian (Speeton Series) of Yorkshire and 

 the greater part of the JN'eocomian of Lincolnshire. In the south of 

 England, however, there seems to be little doubt that there are 

 equivalents, of the upper portion at least, of the Speeton Series. 

 The fauna of the Upper Neocomian of Speeton is spoken of by 

 Prof. Judd as being " most unmistakably that of the Lower Green- 

 sand and Atherfield Clay of the South of England " *. It presents 

 the closest analogy with the Atherfield Clay, but this is believed by 

 Prof. Judd to be due merely to the influence of similar physical 

 conditions on the recurrence of species. There occurs, however, a 

 pebble-bed near the base of the Eolkestone Beds, in which fossils 

 derived from the Oolites occur as boulders. This pebble-bed is 

 correlated by Mr. Meyer with the phosphate-beds at Upware, and 

 with the lower beds of the Greensand (Carstone) of Hunstanton f. 

 He further remarks that though in the Isle of Wight the Folkestone 

 Beds and Atherfield Clay have many of the same species, at 

 Godalming they have not a single species in common. If the Folke- 

 stone Beds with the pebble-bed are taken as the equivalent of the 

 Lincolnshire Carstone, and the Atherfield Clay as that of the Upper 

 Neocomian of Yorkshire, this difference in their fauna is quite in 

 accordance with the view of the relations of the Carstone as detailed 

 above. The following table shows the suggested correlation of the 

 deposits in these different areas : — 



Speeton. 



Lincolnshire. 



Norfolk. 



Bedfordshire. 



South Coast. 



Absent. 



Carstone with de- 



Carstone vsdth 



Sands with 



Folkestone 





rived Neocomian 



derived 



derived 



Beds with 





fauna. 



Neocomian 



Oolitic and 



pebble -bed 







fauna. 



Neocomian 

 fa.una, and 



containing 

 derived 









indigenous 

 late Neo- 

 comian 

 fauna. 



Oolitic 

 fauna, and 

 late indi- 

 genous 

 Neocomian 

 fauna. 

 Sandgatebeds, 

 Hythe beds. 

 Atherfield 



Lower J ^ 



TTealbyBeds. 



\ Spilsby Sandstone. 



Absent. 



Absent. 



Clay. 



^ "On the Speeton Clay," Quart. Journ. Geol. Soe. vol. xxiv. p. 218. 

 t ' On the Lower Greensand of Godalming.' By C. J. A. Meyer (Geologists' 

 Association). 8vo. 1869. 



