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or 30 feet deep, entirely in these 

 sands. In the upper part we find 

 white, ash-grey, and mottled sands ; 

 in the lower part coarse brown 

 sands, in places indurated into a 

 stone like the " Carstone " of IsTor- 

 folk. The only fossil which occurs 

 in any abundance is a species of 

 Fecfen (P. ehngatus?, Lam.), which, 

 however, is very seldom found, 

 except in fragments. 



!N'orth of the typical section, this 

 series of beds appears to become 

 much thinner ; it can, however, be 

 traced at various places, as at 

 Searby, the Gallows Plantation, 

 near Barnetby-le-Wold, and the 

 sides of the valley in which Elsham 

 is situated. The most conspicu- 

 ous parts of the stratum at these 

 places are the masses of hard green- 

 ish sandstone and grit (often full 

 of casts of Pectens), which are used 

 for building. 



On going southwards, however, 

 we find that as the Kmestones and 

 clays of the Tealby series thin out, 

 the sands and sandstones below 

 become of greater thickness and 

 importance, and spread over a 

 much more considerable area. The 

 formation here constitutes the mass 

 of numerous ridges and isolated 

 hills which are capped by the pecu- 

 liar drift already described, and are 

 characterized by their fantastic and 

 often picturesque outlines. The 

 bottoms of the valleys between these 

 ridges and hills are formed by the 

 blue clays, which lie below the 

 beds I am describing, usually much 

 covered with alluvium. See sec- 

 tion, fig. 5. 



With the exception of the species 

 of Pecten already mentioned, frag- 

 ments of which occur in great 

 numbers scattered through the 

 sandstone, fossils are rare, and usu- 

 ally confined to particular bands 

 of nodules. Such bands are seen in 



