'24 GEOLOGY OF THE ISLE OF WIGHT. 



PI. VIII. — Alum Bay, from Headon Hill. 



This view is taken from the side of the hill, where 

 the pathway from the summit of the Downs winds 

 along the edge of the cliff, to the foot-track that con- 

 ducts to the sea-shore. In this sketch, the nearly vertical 

 Chalk strata which terminate in the isolated wedge- 

 shaped masses, called " Tin Needles" are alone visible. 

 The variegated tertiary sands and clays, that impart 

 so remarkable an aspect to Alum Bay from the sea, 

 form the vertical face of the cliff, on the left hand of 

 the observer, but are not seen in this sketch. The Isle 

 of Portland appears looming in the remote distance. 



PI. IX. — Tertiary Strata of Headon Hill, from 



THE SKA. 



The face of the cliff here represented, exhibits a 

 natural section of a series of tertiary strata, principally 

 of freshwater origin, which have been thrown down, 

 unconformably to the marine deposits in the adjacent 

 cliff of Alum Bay ; for while the latter are vertical, 

 these are nearly horizontal. The foot-path runs from 

 the Downs to the sea-shore, along the steep slope, form- 

 ing the north side of the chasm that separates Headon 

 Hill from Alum Bay ; its situation is indicated by the 

 two upper figures. 



PL X. — Chalk Cliffs, on the west of Fresh- 

 water Gate. 



The face of the cliffs to the west of the landing-place 

 at Freshwater Gate, presents a nearly perpendicular 



