30 GEOLOGY OF THE ISLE OF WIGHT. 



cessively traced to the Portland oolite, which termi- 

 nates the point on the left of the sketch. The natural 

 arched rock, called " Barn Door" at the entrance of the 

 Cove, consists of Portland limestone. 



PI. XX. — Geological Map of the Isle of Wight. 



Each of the three Formations, or principal groups of 

 deposits, of which the Isle of Wight is composed, is 

 defined by a separate colour. 



The pink, denotes the tertiary Eocene strata ; the 

 shaded parts indicate the London clay, and other marine 

 beds, in which but few, if any, freshwater fossils occur. 



The blue, marks the Chalk ; the chief subdivisions of 

 this formation, namely, the Firestone, Gait, and Green- 

 land, being defined by a difference in the lines of 

 shading. 



The sienna, indicates the Wealden deposits, which 

 appear in the bays on the east, and w r est, of the pro- 

 montory of the Under-cliff. 



*»* For the original sketch of the Geological Map. and for the drawings 

 of Organic remains, 1 am indebted to the kindness oi Professor Woodward, 

 of the Agricultural College, Cirencester. 



Allographs are by Mr. James Lee, of Prince's-square, Kennington 

 ■ ommon. 



