88 



MB. W. J. CLARKE ON THE UNCONFORMITY IN THE [Feb. I90I, 



underlying saem of Eed or Calamincar Clay. These strata here 

 constitute the basement-beds of the Upper (red) Series. The only 

 possible interpretation of this fact appeared to me to be the sup- 

 position that the Middle productive Coal-Measures were tilted up, 



Fig. 1. — Section in Madeley Court Colliery. 



N.N.W 



S.S.E 



[Scales: vertical, 400 feet = l inch; horizontal, 10 chains=l inch,] 



and their edges denuded, before the Upper (red) Measures were 

 deposited. In order to ascertain how far this supposition was true, 

 it was necessary for me to trace the seams in the opposite or south- 

 south-easterly direction and plot them in a similar manner ; the 

 following diagram (not drawn to scale) shows the result : — 



Pig. 2. — Diagrammatic section across the Madeley district, 

 Coalhroolcdale Coalfield. 



N.N.W. 



Halesfield 



S.S.E. 



I' 



Hills Lane 



That is to say, the coal- and ironstone-seams were found to terminate 

 against the base of the Upper (red) Measures in a south-south- 

 easterly direction, as they did in the opposite direction — with this one 

 noteworthy difference, that whereas the north-north-westerly rise 

 was abrupt and at a gradually increasing angle, the rise in the 

 south-south-easterly direction was so gradual and at so low an angle 

 that the distance between the outcrops of some of the seams next 

 in order one to the other would amount to 100 yards or more. 



