The Coast-line 



the type of junction which is called unconformable, and 

 it indicates a considerable lapse of time, during which 

 denudation took place, between the formation of the two 

 sets of rocks. 



We were able to obtain one or two fossils from the 

 limestone, and on returning to the beach a further 

 collection was made from the fallen blocks at the foot 

 of the high limestone cliff. These included a sea-urchin, 

 which was identified as being Holaster subglobosus, which 

 is only to be found in the upper part of the Cretaceous 

 formation, and we therefore concluded that we were 

 dealing with the chalk, which was borne out by an 

 examination of the other fossils, which were all of 

 Cretaceous species. 



Still travelling eastward along the shore and 

 approaching the rocky headland of Black Point, we 

 noticed that the line of cliffs ran a little way inland, 

 being separated by a narrow terrace some 50 feet 

 above tide-level from the shingle beach below. Several 

 streams had cut shallow trenches in this terrace, and the 

 exposures in their banks showed that it consisted of 

 shingle and sand arranged after the manner of a beach, 

 and containing shells precisely similar to those of the 

 present shore. This deposit was far too high to be 

 reached by the waves of even the greatest storms, and 

 we therefore decided that it belonged to the class of 

 raised beaches, and indicated a recent elevation of the 

 land to the extent of 50 feet. 



The raised-beach terrace extended right round the 



headland, but at, and near, the point it consisted of a 



rocky platform partly overgrown with mosses and 



lichens, the upper surface being here also at an elevation 



F 81 



