Chalk Strata of Ballard Head. 



419 



two other and larger pinnacles, which cannot remain many 

 years uncompleted. The beds in Studland Bay appear nearly 

 horizontal, which they must do, being merely the ends of 

 those which are along the eastern section, represented as 

 curved ; but it will instantly occur, that these horizontal 

 beds, in the upper part of the cliffs, are the remains of beds 

 whose continuation on the top of the down has been partly 

 destroyed. It is also clear that the termination of the beds 

 injunction with the vertical ones does not appear in Studland 

 Bay. 



To give some idea of the appearance of the Pinnacles from 

 the top of the down, we give the woodcut Jig, 40., which 



Purbeck. 



Ballard Down. 



fit on sdi 01 



from the top of the cliffs. „ ,, , Durlstone Head. A, Pebbles, limpets, 

 &c , thrown up from below by the sea. 



points out the projection of Durlstone Head beyond the 

 softer beds of Hastings sand in the cliffs of Swanwich Bay. 



The tendency of the chalk to form insulated masses, when 

 exposed to the sea; is further illustrated by Jig. 41., which 

 represents a sketch of two similar pinnacles off Flamborough 

 Head, taken by me in 1823, and which are there called the 

 King and Queen Rocks. 



Similar examples occur off the Dorset and Devon coasts, 

 near White Nose, and off the French coast, between Dieppe 

 and Havre. 



Fig. 42. represents the appearance of the Old Harry 

 Rocks from the very extremity of the cliff of the mainland, 

 and the position of the Needles in the Isle of Wight directly 

 opposite, at the distance of sixteen miles. The action of the 

 sea upon these insulated pillars, and on the whole of the 

 chalky cliffs, is continually changing their size and shape, and 

 modifying the surface. It is not improbable that the effects 



