D. Jones — On the Carboniferous Deposits of Shropshire. 365 



proves workable. In a Clod about 3ft. 6in. lying 

 witbin tbis 21 feet, is tbe Ironstone wbicb was 

 formerly so extensively wrougbt. Tbe nodules vary 

 from a few pounds to half a ton in weight. 



14. Bottom Coal ... ... ... ... ... 2ft. 4in. 



Sometimes rests upon the Millstone Grit, and in 



other cases is separated from it by a few feet, or as 

 much as five or six yards of Coal-measure. 



15. Measures as described above, say ... ... ... 12 



16. Millstone Grit, say ... ... ... ... 50 



17. Old Red Sandstone. 



Now it is obvious that these measures and Coal-seams cannot 

 be compared with, the " Gutter Coal" of Cornbrook, which we have 

 seen lies within a few feet of the Millstone Grit, although they 

 themselves are found lying on or within a few feet of the same grit ; 

 but we find every element of comparison with a zone of Coal- 

 measures 400 feet above the Gutter Coal at Cornbrook. 



Thus I consider the Jewstone Black Coal to be the equivalent 

 of the Great Coal, differing only by its being divided by a few inches 

 of Clod, and we shall notice that all the Brown Clee Coals show the 

 same tendency to " split up." Beneath the Jewstone Black is 

 a Clod containing Ironstone in the lower part, and this is the same 

 as the Cornbrook " Three Quarter Ironstone," and the " Three 

 Quarters Coal" of each locality is the same. The " Clumper Beds" 

 which lie between it and the. Smith Coal of Cornbrook are not 

 wanting between the Three Quarters Coal and Batty Coal of Brown 

 Clee, and we must consider the Batty Coal to be the same as the 

 Smith Coal. This view is supported not only by the " dumpers " and 

 Three Quarter Coal overlying it, but from its very quality as fuel. 

 One portion is described as a "Sweet Flaming Coal,-" another as 

 " good blacksmiths' Coal," the same properties which gave rise to its 

 being called "Smith Coal" at Cornbrook. We observe that it is 

 divided into three seams by their Clods. At the Watsell pit, in 

 Cornbrook basin, which is the nearest point to the Brown Clee at 

 which I have any shaft section, the " Smith Coal" is thus divided : 



Tops ... ... ... Oft. 9in. 



Clod ... ... ... 1ft. 9iii. 



Coal .. ... ... 2ft. 6in. 



Thus showing a tendency to divide in the direction of the Brown Clee. 

 The Bottom Coal with its overlying Eider must represent the 

 Four-feet Coal of Cornbrook, though it is separated from the over- 

 lying Coal by sixty-four feet of measures. This ground seems 

 variable, for 



At Cornbrook it is ... ... 9ft. 



At Watsell Pit ... ... ... 13ft. 



AtKnowlbury ... ... ... 28ft. 



The important deposits of Ironstone in the lower part of this 

 ground are noteworthy. In the Watsell pit no Ironstone is shown at 

 this horizon, yet in the Cornbrook Pit, still further South, we have in 

 this place a six-feet " Shale, with balls of Ironstone." The Bottom 

 Coal, as I have said before, rests upon the Millstone Grit, except 

 where a few feet of Clods intervene. 



It is obvious, then, from the foregoing, that Cornbrook was 

 the site of a much lower surface than the Brown Clee surface at the 

 time the Four-feet Coal was deposited. If the Millstone Grit were 



