Kendall : The Concealed Coalfields of Yorkshire, etc, 233. 



Yorkshire, yet as far as I know the same structures are not 

 to be seen anywhere else in England, nor, I think, in the world ! 



Geologists as a rule take little interest in concretions, and 

 this explains why these beds are so little known, yet to my mind 

 many and valuable lessons, and, perhaps, many of the laws of 

 segregation will be learnt from the study of the Cellular Con- 

 cretionary Limestone at Fulwell. 



THE CONCEALED COALFIELDS OF 

 YORKSHIRE, DERBYSHIRE, AND NOTTINGHAMSHIRE. 



Prof. P. F-. KENDALL, F.G.S. 



(Continued from p. 201.) 



The extension of the Charnian barrier in a south-easterly 

 direction can be traced beneath a mantle of Triassic and newer 

 rocks by tw^o classes of evidence — that of bore-holes and shafts 

 which, on a belt of country corresponding with the prolongation 

 of Charnwood Forest, encounter early Carboniferous or yet 

 older rocks immediately beneath beds of either Triassic, Liassic, 

 or Oolite age — it has been proved as far as Bletchley, which is 

 forty-six miles from the nearest visible outcrop of the Charn- 

 wood rocks. The second class of evidence is that of persistent 

 folding. Nearly every division of the Secondary rocks older 

 than the Chalk shows signs of contemporaneous or subsequent 

 movement. Some, such as the Trias, Kimeridge Clay, and 

 Lower Green Sand are almost or entirely absent on this line ; 

 others, like the Inferior Oolite and Gault, show signs of 

 thinning and subsequent denudation, while others, like the 

 Lias, along with some diminution give evidence of contemporary 

 movement in planes of erosion, with water-worn fossils at 

 various levels in the formation. 



These signs mark the Charnian axis as perhaps the most 

 unstable and persistently accentuating fold that has yet been 

 recognised in Britain. In view of its persistence and magnitude 

 and its proved relation to the edge of the coalfield between 

 Nottingham and Leicester I find no escape from the conclusion 

 that, so far as it can be traced, it will stand in the same relation 

 to a deeply concealed portion of the coalfield that it does to the 

 part which has been proved by boreholes at Ruddington and 

 Owthorpe. 



1905 August I. 



