88 



GEOLOGY OF THE ISLE OF WIGHT. 



At Yarbridge all the subdivisions of the Chalk are exposed. 

 Two large pits are situated on the side of the road to Alverstone, 

 the upper one wholly in the Chalk-with-flints, the lower one partly 

 in this and partly in the Middle Chalk. 



Pit half a mile west-north-roest of Yarbridge. 



Chalk with a few ^rey flints - - - 



Rough nodular chalk, with lumps slicken- 



sided and weathering yellow ; fossiliferous in 



the lower part . . . - 



White marl parting . . - - 



TT r\, n J Rough chalk with Terehratula semiglobosa • 

 Upper i.halk <j g^^^j^ ^^^^ 



Rough chalk - . - - - 



Smoother chalk .... 



Chalk Rock, a single line of green-coated 



nodules lying on ... 



Rough nodular chalk _ . . 



iv/r-jji nu 11 f Smooth chalk . _ . - 

 Middle Chalk I j^^^^ 



The same beds were formerly exposed in Yarbridge in some 

 pits which are now partly hidden by building. Mr. Whitaker 

 noted the following section* : — 



Chalk with a few nodular flints (shown only at the northern end of 

 the quarry, where it is 20 to 30 feet thick). 



Thin seam of dark-grey clay. 



Chalk, about 8 feet. 



Inconstant layer of irregularly-shaped green-coated nodules (Chalk- 

 rock p) 



Evenly and massively bedded chalk, without flints, but with seams of 

 marl. 



The Middle and Lower Chalk are well exposed in a pit about 

 200 yards west of the upper road in Yarbridge, which shows the 

 followinsr section : — 



Ft. In. 



30 



Melbourn 

 Rock. 



Pit icest of Yarbridge. 



Massive chalk in beds of 2-3 feet, iron 



pyrites ..... 



Thin-bedded chalk in beds of 6-8 inches, 



with partings of greenish marl 



[" Hard nodular bed . - . . 



< Laminated greenish marl ... 



L Hard nodular bed .... 



{Smooth earthy chalk with curvilinear jointing 

 passing down into - - . 



Grey or greenish marl with curvilinear joint- 

 ing passing down into ... 

 Hard chalk ----- 

 Marl ..... 



Alternations of marl and blocky chalk 



We now reach the great section afforded by Culver Cliff, There 

 the sub-divisions are not only well exposed, and the different 



* Qitart. Journ. Geol, Soc, vol. xxi. p. 404. 1865. 



