412 



Transactions. — Geology, 



of clay, when a plentiful supply of water was tapped, which brought up a 

 considerable quantity of sand. Some idea of the quantity issuing from the 

 pipe may be gathered from the fact that, though the extremity was three 

 feet above the surface, the water was forced up in a soUd mass five inches 

 higher (pipe 2i inches in diameter). 



The well had then reached a depth of 100 feet, but as it frequently 

 brought up sand, and as the taste of the water was not so good as was ex- 

 pected, the owner, about ten years after, had it sunk another 8 feet. It was 

 easy to drive, eight to ten blows to the inch, through a bed of shingle. 

 Some of this, brought up by the force of the water, was of so great a size, 

 that the burred edge of the pipe had to be cut off to allow it to pass out. 

 The water was now entirely free from sand and much improved in taste. 



It will be seen by referring to the list of strata passed through, that the 

 well, when bored the first time, ended in a bed of shingle, with a deposit of 

 clay above. When sunk deeper, the second time, it again passed through 

 clay with shingle beneath, which was further penetrated in the third boring. 

 The above agrees with the following statement made in Professor von 

 Haast's work:* "The bottom of the water-bearing stratum consists in- 

 variably of a bed of shingle, mostly of small size, upon which a deposit of 

 sandy clay reposes. 



I might mention that when the well was left, after the third boring, 10 

 feet of shingle was present in the lower end of the pipe. 



TABULATED LIST, 

 Showing the depth of the various strata, borings, etc. 



Depth. 



IJ feet 



3 

 15 

 30 

 90 



92i 

 94 



97 



98 



100 



108 



Description of Strata. 



Black Soil 



Clay 



Sand 



Shingle . . 



Blue Sand 



Peaty SoQ . . \ 



Wood, Shells, and Clay j 



Shingle . . 



Sand 

 Peat 



Clay 



Sliingle . , 



Thickness of Stbata. 



I. Boring. II. Boring. HE. Boring. 



IJ feet 

 la 



12 

 15 

 60 



^ 



3 feet 



1 „ 



2 „ 



8 feet 



• " Geology of the Provinces of Canterbury and Westland, New Zealand." By 

 Julius von Haast, Ph. D., F.E.S., etc., 1879. 



