68 GEOLOGY OF THE ISLE OF WIGHT. 



base of the Chert Beds.* Another spechnen has been recorded 

 by Mr. Parkinson from the Chert Beds at Steephill, about 10 feet 

 below the Chloritic Marl.t A femur of a reptile is stated by 

 Mantell to have been found at Bonchurch three or four feet above 

 the firestone.l 



For the other fossils the reader is referred to the tabulated lists 

 at the end of the volume. 



Coast Sections. 



1. Compton Bay. 



The following details were observed in the cliff forming the west 

 side of Compton Bay : — 



Chalk Marl (see p. 83). Feet. 



Chloritic Marl (see p. 81). 



r rv> f r Green sand with 10 or 12 bands of 

 1 i^ J \ chert, light-brown outside, blue 

 I ^^^'- I inside - - - - 13 



Darker green sand, light-green when 

 dry, with small scattered phosphatic 

 nodules and lenticular masses of 

 Malm i' chert or rag - - - 32 



Rock, "^i Sandstone, jointed and weathering 

 ; into caves at the foot of the clifl". 



I I Many black nodules scattered 



(^ l_ throughout- - - - 41 



Gault - - Passage Beds (see p. 63). 



Upper 

 Greensand 



<: 



86 



The Chert Beds are not so well developed here as in the central 

 parts of the Island, and the chert itself is more calcareous. The 

 freestone bed also, so marked a feature in the Undercliff, cannot 

 be recognised. 



2. Blackgang to ShankUn. 



Gore Cliff shows the Upper Greensand in a form that is typical 

 of the central and southern parts of the Island. The Chert Beds 

 form a vertical face, deeply scarred by the weather, each band of 

 chert forming a ledge, while the soft sands between have been 

 scooped out by the wind. At the foot of this vertical part of the 

 cliff the 5-foot bed of freestone runs for some miles and can 

 generally be recognised at a glance. The Malm Rock below 

 forms a steep, often precipitous slope. ^ 



* Notes on the Geology and Chemical Constitution of the various Strata in the 

 Isle of Wight, p. 25. See also Quart. Jvurn. Geol. Soc, vol. xxxvii. p. 372. The 

 specimen is incorrectly stated by Mantell (Geol. Excursions in the Isle of Wight, 

 pp. 215, 217) to have been found in the Chalk Marl. 



■j- Quart. Journ. Gcol. Soc, vol. xxxvii. p. 372. 1881. 



X Geological Excursions, pp. 179, 180. 



