218 
care is needed in forming an hypothetical opinion under such 
conditions. 
It is extremely difficult to realise how great the dislocation 
must have been in this neighbourhood. To the west are the 
older formations, and all eastward are the secondary rocks, 
under which doubtless are the rocks of the west, which have 
probably been much depressed by a great fault, as there is every 
reason to believe that, if the Lias in the plain were pierced to a 
sufficient depth, the older formations would be found, as in the 
neighbourhood of London, at Kentish Town, and recently at 
Richmond, where a well has been sunk 1,310 feet—150 feet 
lower than that of any well within the London basin; and, 
strange to say, no Lias was met with, or Inferior Oolite; a 
bed, 874 feet thick, was passed through, supposed to be Great 
Oolite. 
