136 GEOLOGY OF THE EAST CLIFF. 



carbonaceous loam, which allows a little 

 vegetation to grow upon its face. There is 

 another band of similar loam at about 13 feet 

 from the bottom of the Ashdowns. 



Above the main Sandrock bed, which 

 occupies the centre of the Cliff, a bed of 

 an entirely different nature may be observed, 

 which is 12 feet thick, and consists of dark 

 blue clays and shales, with partings of thinly- 

 bedded sandstone, and ironstone. About the 

 middle of the bed occurs a band, from 6 inches 

 to 15 inches thick, of a blue calcareous stone (of 

 inferior quality for road metalling) containing 

 on the upper surface numerous foot-impressions 

 of Iguanodon. These, in consequence of the 

 original firmness of the bed upon which the 

 animals walked, are not generally very 

 distinct, the deep imprints of the toenails only 

 being left ; in some cases, however, a good 

 impress is obtained. 



Above this clay bed we reach another 

 bed of white sand rock, of about 19 feet in 

 thickness, and constituting the top of the 

 Ashdown Sands. 



