The Coast-line 



this rock that there was a recess some 20 feet deep 

 in the cliff face at this point, the saccharoid limestone, as 

 the white crystalline variety is called, being softer than 

 either the unaltered limestone or the basalt, and thus 

 wearing away more rapidly under the action of denuding 

 agents. 



The basalt, as we knew, was an igneous rock, and the 

 alteration of the chalk along the line of junction was 

 doubtless due to the action of the heat from the basalt, 

 which must have reached its present position in a molten 

 state. 



LEVEL OF RAISED BEACH 



FIG. 9. Junction of Chalk and Basalt, a, Basalt ; , Chalk ; c, Altered 

 Chalk on line of contact. 



We next proceeded to the end of Black Point and, 

 it being still some time from high water, noticed that the 

 black basaltic rocks of the point ran out for a consider- 

 able distance into the sea, forming a dangerous reef over 

 which the current of the incoming tide was rushing with 

 great violence towards Seaview. It was this current, 

 doubtless, which was responsible for the transport of the 

 boulders of basalt in the direction of Seaview, they 

 being then flung up on the beach by the action of the 

 storm waves. 



On rounding the point we saw before us a large bay 



83 



