15- rHE STORY OF THE EARTH. 



its upper part, which probably show that the Hun- 

 stanton limestone, which first begins to be recog- 

 nised near Sandringham, includes the Upper ( iault. 

 The Gault extends as a clay all round the Weald, 

 and through the Isle of Wight; so that its distri- 

 bution is connected with the area occupied by the 

 Wealden beds; and the changes of level by which 

 that district was effected. 



The Upper Greensand generally follows the dis- 

 tribution of the (rank ; but there are certain areas 

 from which it is absent as a recognisable sand. It 

 is well developed in the Isle of Wight, and extends 

 from Eastbourne through the South Downs and 

 through the greater part of the North Downs; but 

 there is no deposit of a sandy nature in the Maid- 

 stone country, found 

 between the Gault and 

 the chalk, which pass 

 insensibly into each 

 other. From Wiltshire 



the Upper Greensand 



extends to Tring, as a 



green sand, whi< h is 



there about 30 I 

 thick ; east of Tring 

 its sandy character is 

 lost. It has been found 



by a well boring again 



Flo. v. Ammonite* planulatus, t <» put on the character 

 mbridee ( ireensand. ,- , 



K ot a green sand under 



nrich. All the intervening country, winch 

 Professor Hull regards as having been land, dur- 

 ing the deposition of the ( Carboniferous limestone, 

 red with a thin bed known as the Cambridge 



:./, which is not nn >iv than a fool or t u < 1 in 



thickness, and consistsof nodules of phosphati 



