Sotith-Western Part of Somersetshire. 353 



did not continue driving the level, but worked in the limestone on 

 all sides. The mine has however been abandoned, as the produce 

 was not sufficient to bear the expence of an engine to drain off the 

 water.* 



§ 17. I found specimens of the black slaty limestone at the 

 mouth of the pit, and I afterwards observed the same stone in the 

 limestone quarry near Ely green interposed between the beds of 

 limestone. It is of a coal black colour, but becomes white when 

 heated : dissolved in muriatic acid it leaves a black powder, and this 

 powder when heated is partly dissipated, and what remains is a white 

 earth. The limestone appears therefore to owe its black colour to 

 carbonaceous matter. 



Besides the quarries I have named there are several others, but 

 as they present no appearances different from those I have already 

 described, it is not necessary to do more than mark their occurrence 

 on the map.f 



§ 18. About a furlong eastward of Halsey cross, in a quarry 

 where stones are obtained for mending the roads, I found strata of 

 the coarse grained and slaty varieties of the grauwacke formation, 

 alternating with a calcareous rock different from any other I had 

 seen in this district. Its colour is in general reddish brown, very 

 similar to the strata that alternate with It, but the calcareous strata 

 are not all alike. In none of them are there any traces of organic 

 remains, unless indeed some detached crystalline lamlnas may be 

 considered as indications of them. The principal varieties are 



* I received this account of the Doddington mine from my friend Thomas Poole, Esq. 

 of Nether Stowey. 



+ The position of many of those quarries has been pointed out to me by my friend 

 the Rev John Poole of Enmore, fo whom I am indebted for much valuable assistance in 

 the prosecution of this inquiry. 



Vol. III. 2 Y 



