Beeby Thompson — Use of a Geological Datum. 217 



It is fairly well known that one deep shaft and four deep borings 

 ■have been made within Northamptonshire, two in search for coal 

 and three for water.^ The best readily available account of these 

 is contained in a paper by the late Mr. H. J. Eunson, published by 

 the Geological Society.^ 



Below is given an abbreviated and rearranged account of these 

 five sections in accordance with information contained in the paper 

 above referred to, together with certain corrections which it is the 

 partial object of this paper to justify. 



Summary op Deep Borings in Northamptonshire. 



Thickness infect. 



In the preceding Summary of Borings I have grouped various 

 beds together where there might be a difference of opinion as to 

 their individual limits, and where so doing does not affect the 

 objects of this paper. For instance, in three of the sections — 



^ For convenience we will speak of all as borings. 



- Henry John Eunson, F.G.S., "The Range of the Palaeozoic Rocks beneath 

 Northampton": Quart. Journ. Geol. Soc, vol. xl, ^i. 3, No. 159, pp. 482-496. 



