ARTESIAN WELLS IN DORSET AND ELSEWHERE. 199 



Reading Beds 



Chalk 



Plastic and variegated clay 

 Clays and sands sometimes 



impregnated with pyritous 



salts 



Flints of junction bed 

 Chalk and flints 



Total 



Thickness. Depth. 

 Ft. In. Ft. In. 

 45 % 



26 



4 

 40 



75 



40 o 



1 3 oft. 



This is, of course, only a very generalised section, but the 

 chief point to note is that in the Wimborne Waterworks, the 

 boring was carried down 4oft. into the Chalk. 



We now come to the consideration of the Bournemouth 

 Waterworks, by far the most important work of the kind 

 hitherto attempted in Dorset. In this case the vertical section 

 shows 96ft. gin. of superficial and Tertiary Beds down to the 

 Chalk an amount of Tertiaries slightly in excess of the adjacent 

 boring. It must not be forgotten that although these are called 

 the "Bournemouth" Waterworks, the water is derived from the 

 Dorset Chalk, and subsequently conveyed into the adjoining 

 county. 



The following is the vertical section : 



Superficial Beds 



Lower Tertiaries 



Soft Chalk (Upper Heading) 



Hard Chalk 



Band of flint 



Chalk to bottom of well (Lower 



Heading) 

 Trial boring in Chalk . . 



28 



45 



2IO 

 2; > 



Thus the " Bournemouth" Well is 2ioft., whilst the Wimborne 

 Well is 1 3oft. deep. 



