138 GEOLOGY OF THE EAST CLIFF. 



FORMATION No. 3. 



WADHUKST CLAYS. 



Near the East Groyne, the Wadhurst 

 Clays occupy a position at the top of the Cliff, 

 and are plainly distinguishable from the thick 

 beds of Sandrock belonging to the Ashdown 

 Sands below. 



A thin band of carbonaceous sand, from 

 a few inches to 12 inches in thickness, occurs 

 at the base. The beds consist mainly of dark 

 blue clays and shales with thin partings of 

 sandstone, often containing " bluestone." 

 About 10 or 15 feet above the base is a bed of 

 dark brown or buff Sandstone, some 4 feet 

 6 inches in thickness, from which "bluestone" 

 is obtained, but this latter is seldom 

 thicker than 18 inches, and is sometimes 

 absent. It is a calcareous sandstone, similar 

 to that found at the base of the sandrock 

 bed below, and is regarded as the best quality 

 of stone obtained here for road metalling. 

 Where the sandrock is associated with the 

 " bluestone," the junction is generally 



