490 



MESSES. WHITAKEE AND JUKES-BROWNE ON [Aug. 1 894, 



water for some new buildings on the Earl of Cadogan's estate, and 

 it was expected by the engineers (Messrs. Le Grand and Sutcliff) 

 that such a supply would be found in the Lower Greensand, as in 

 the neighbourhood of Cambridge. They were advised by Mr. W. 

 H. Dalton, who calculated that the base of the Gault would be 

 reached at about 610 feet from the surface, a prediction which 

 proved to be within about 5 feet of the truth. 



The hope of getting water, however, was not realized : a plentiful 

 supply of hard water was found in the Chalk, but the sandy beds 

 below the Gault did not yield any water. The Gault seems to pass 

 down into sandy clay, below which are alternations of calcareous 

 stone aud sandy material, and at the depth of 637^ feet the bore 

 entered a hard greenish slate. 



Puzzled by this hard rock, and finding that Mr. Dalton was away 

 from home, Messrs. Le Grand and Sutcliff applied to the Geological 

 Survey Office for information, sending samples from the lowest part 

 of the bore. On examining these we reported that Palaeozoic rocks 

 had been reached, and that the prospect of obtaining water by 

 going deeper was very small. At the same time we pointed out the 

 importance of the discovery of Palaeozoic rock at so small a depth, 

 and urged Messrs. Le Grand and Sutcliff to obtain Lord Cadogan's 

 permission to carry the boring a little deeper — in order to ascertain, 

 if possible, to what formation the slaty rocks belonged. The boring 

 was carried nearly 20 feet deeper, through soft slaty shale with 

 some harder beds, and was stopped in this material at a depth of 

 657| feet. 



The following is the account of the boring sent to us by Messrs. 

 Le Grand and Sutcliff, and we prefer to give this first, exactly as 

 furnished by them. We will then describe the samples which were 

 submitted to us, and by their aid will endeavour to determine the 

 stratigraphic horizons of the beds. Unfortunately the samples 

 obtained were too few to enable us to do this in a very satisfactory 

 manner. 



Pit (d«g) 



Chalk and flints , 



Hard chalk and flints 



Chalk-rock [i. e. very hard chalk] with a 



layer of flints at the base. Sample 1 ... 

 Hard chalk with a layer of flints at the base. 



Samples 2 & 3 



Hard chalk 



Soft, chalk 



Chalk, rather hard. Sample 4 , 



Chalk getting like marl 



Grey chalk-marl. Sample 5 



Gault, dark-grey clay. Samples 6, 7, & 8 .., 



Sandy Gault. Sample 9 , 



Sandy Gault and stone in alternating layers 



Samples 10, 11 



Greensand stone. Sample 12 



Claystone. Sample 13 



Shaly stone. Sample 14 



ickness. 



Depth 



Feet 



Feet 



6 



6 



341 



347 



26 



373 



16 



389 



18 



407 



7 



414 



4 



418 



59 



477 



6 



483 



79 



562 



36 



598 



27 



625 



11 



636 



H 



637* 



2| 



640 



17* 



657i 



