W. WHITAKER ON SOME BORINGS IX KENT. 



45 



except where that may be taken as the sum of two such distances, 

 from these borings being almost in a straight line ; and it is 

 curious that in two cases these borings are in one straight line, so 

 far as can be seen on a map of this small scale : these are firstly, 

 Richmond, Meux's, and Harwich, and secondly Ware, Crossness and 

 the Subwealden boring. 



Shetch-Map, showing relative positions and distances of deep 

 borings in the London district and South-east of England. (The 

 numbers indicate distances in miles.) 



Z^ It will be seen that the whole are enclosed in an irregular four- 

 sided figure, of which the sides are 27, 48, 57, and 77 miles long. 

 Of course the distances are not absolutely exact, but only as near as 

 can be measured on such a map, and near enough for our purpose. 

 As it may be useful to have the distances between each boring 

 and every other plainly before us, that information is given below in 

 a tabular form, from which it follows that the greatest distance 

 apart at which Jurassic rocks have been found in these borings is 

 48 miles, whilst for possible Trias the figure is 19, and for Devonian 

 14. 



