IO GEOLOGICAL STRUCTURE 



in Surrey, lies at the base of the upper zone of the 

 Lower Greensand. 



To render the geological description complete, we 

 must quit the parish of Harting, and, entering that of 

 Rogate, continue our little trip to the north. By so 

 doing we pass over other and inferior members of the 

 Lower Greensand until we reach the Weald Clay of 

 Harting Combe. 



The river Rother, on which is placed Fair Oak, the 

 seat of the Honorable J. Carnegie, runs from west to 

 east, between the higher or Petersfield and Shanklin 

 sand; and the next lower portion of the formation, or 

 the Sandgate beds of Kent, is the Rogate Sandstone 

 of this tract. To the north other and inferior strata 

 rise into hills of some altitude, on the southern slopes 

 of which are situated the country houses of Rogate 

 Lodge and Dangstein. It is in this portion of the 

 formation that the greater number of fossils occur, 

 particularly near Hythe in the so-called Kentish Rag 

 at Maidstone and Seven Oaks. The following are 

 typical forms : Perna alaeformis, Pinna crassa, Tri- 

 gonia spectabilis, Trigonia alaeformis, Corbis corrugata, 

 Astarte obovata, Cyprina angulata, Pholas giganteus, 

 Ammonites Nutfieldiensis. 



There are thin layers of clay in both the sandstones 

 above described, which serve to hold up lines of ponds, 

 as at Petersfield, Sping, Woolmer Forest, &c. 



The hills which constitute the escarpments of the 

 valley of Harting Combe are composed of a sandstone, 

 a variety of the Kentish Rag, which is no longer so 

 ferruginous as the upper portion of the deposit, green 

 grains being abundant in the body of the rock, which 

 constitutes an imperfect building stone, and becomes 

 more and more argillaceous as you descend into the 

 valley. 



Farther to the east, i.e., at Petworth and beyond 

 it, this standstone is a more compact building stone, 

 though affording few fossils here. 



The bottom bed of the Lower Greensand is a zone 



