UODrXG PETROLEUM:. 
41 
also in this district is the so-called “ Boiling Spring” of 
Turner’s-Hall-Wood, which is the result of the action upon 
water of an impure carburetted hydrogen — a jet of that 
g as issuing from a small hole in the ground in that locality 
and producing ebullition when water is thrown into the 
hole. 
If we except the siliceous shields of the microscopical 
animaculce ( infusoria) abounding in the chalk and some 
of the sandstones, and a few sharks’ teeth and spines of 
•chini found in sandstone on Bissex Hill, organic remains 
are wanting here. It is true, a few shells- described by 
Sir Bobert Schomburgk and mentioned as coming from this 
region were obtained with great difficulty from a hard 
water- worn boulder on Springfield estate ; but the boulder 
itself is alien to, and differs from any rock either of this 
or the preceding formation. How, or by what agency 
the boulder came here, I do not presume to say. 
The Petroleum or Green Tar, the more important subject 
of this paper, exudes from the strata of this district, and 
is found floating on the surface of its rills, and on stag- 
nant pools of water. Its easily vaporisable nature causes 
it every where to impregnate the atmosphere of the dis- 
trict with its pungent, bituminous, but not unpleasant 
odour. 
There is a very general impression that the Green Tar is 
to be found, and can only be collected within the boun- 
daries of the Scotland formation, but this limit to the sup- 
ply of the tar is not I think at all probable ; for it has been 
found as a supernatant fluid on the water of a well in the 
parish of Christ-Church, and it is sometimes seen floating 
on the sea at Ostin’s Bay in the same parish ; and in sink- 
ing the cylinders of the new Bridge now in course of erec- 
tion in Bridgetown, logs of wood undergoing transform- 
