84 BLUE CHALK MARL. 



Blue marl, containing hamites, ammonites, nuculae, &c. - 95 feet. 

 Marl, with a great proportion of chlorite sand without organic 

 remains, ________ _ 45 feet. 



140 feet. 



Chiltington, on the estate of John Marten Cripps, Esq. M. A. 



Blue marl, containing nuculae, inocerami, ammonites, &c. 90 feet. 

 Near New Timber (communicated by Richard Weeks, jun. Esq. F. L. S. 

 of Hurstperpoint). 



1. Grey chalk marl, gradually passing into the next bed, - 20 feet. 



2. Blue chalk marl, enclosing immense numbers of ammonites, 

 inocerami, nuculae, &c, --_--__ 70 feet. 



90 feet. 



It is unnecessary to multiply examples ; the sections above described 

 exhibit every material variation observable in the characters of this 

 deposit, in the south_eastern part of Sussex ; we shall now pass to the in- 

 vestigation of the limestone beds that occur in the western division. 



Malm Rock or Western Sussex. 

 The Malm Rock has been already mentioned, as occupying the same 

 geological position as the blue marl. It is a compact argillaceous lime- 

 stone, of a blueish grey colour, the lower beds being hard and durable, and 

 affording a good material for building*. " The grey chalk passes in- 

 sensibly into the malm rock, which forms a basement to the chalk hills of 

 more than half a mile in breadth, and constitutes the substratum of a 

 good corn soil. It may be traced with but little interruption from Sul- 

 lington, near Storrington, to Petersfield." 



* My friend J. Hawkins, Esq. favoured me with a series of specimens, shewing the gra- 

 dual transition of the grey marl into the malm rock. 



