Strata between Durlstone Head and Old Harry. 129 



actually not below, but to the southward. 



plans, \fig> 11 and 12) explain this position. 



11 



The following 



Profile of the cliffs at Punfield, head of Swanwich Bay. 



1, Chalk. 2, Chalk marl and upper green sand. 3, Gault and lower 



green sand. 4, Weald clay. 5, Hastings sands. A, Punfield. 

 B, Ballard Point. C, Swanwich Bay. 7, Apparently horizontal 

 layers of flint, the same as 3 in fig. 12. 



12 



Chalk cliff, north side of Swanwich Bay. 



1, Gault and lower green sand. 2, Chalk marl. 3, Chalk. N, 



Old Harry. X Ballard Point. 



The chalk marl, in consequence of the pressure it has sus- 

 tained, and the effects of the atmosphere, when seen from the 

 end of Ballard Point obliquely, looking towards Punfield, ap- 

 pears columnar ; that is to say, the fragments into which it 

 is broken, (and it has a peculiar conchoidal fracture, breaking 

 into lumps of nearly a regular form), assume, when partly dis- 

 jointed, that peculiar appearance which characterises basalt. 



Dr. Mitchell next attempts to correct Sir H. Englefield. — 

 That writer, however, does not misname Ballard Point, Stand- 

 fast Point, but he calls the whole promontory between Stud- 

 land and Swanwich Bays, Hand-fast Point. The misnaming 

 all belongs to Dr. M. 



As to Jig. 36, which is said to be "exceedingly bad" — and 

 fig. 38 "equally so ; " I freely confess this sentence, as it re- 

 spects the latter figure, is by no means undeserved : as to the 

 former, it is faulty, but not "exceedingly bad." But before I 

 proceed to explain these, and a manifest error in them, and 



l2 



