298 



STRATIGRAPHICAL GEOLOGY 



There is a similar set of beds near Manchester, but they have 

 not yet been fully correlated with the above. 



On the eastern side of the Pennine range these beds are con- 

 cealed beneath the newer rocks, but have recently been proved in 

 a boring at Thurgarton, near Southwell, in Nottinghamshire. 

 The cores indicate a succession like that of North Staffordshire, but 

 with a less thickness. Mr. W. Gibson (op. cit. p. 262) gives it as 

 follows : 



Feet. 



Permian (Marl slate). 

 TT i r> j . /Red sandstone and marl with Neuropteris rarinervis and 



1 \ Pecopteris Miltoni 188 



Beds \ ^ rev sandstones and shales with a seam of coal . 91 

 Etruria marls : red marls and green grits ..... 257 

 Grey Coal-measures below. 



N.N.W. 



Halesfield 



S.S.E. 



Hills Lane 



j 



Fig. 99. SECTION ACROSS THE MADELEY DISTRICT, COAI.BROOKDALE (W. J. Clarke). 



a. Middle Coal-measures. b. Upper Coal-measures. 



In Yorkshire near Kotherham there are some red marls and 

 sandstones which are classed as Upper Coal-measures, and probably 

 belong to the Etruria marls, but only 54 feet of them are seen. 



When these Upper Coal-measures recur in the more southern 

 coalfields of Shropshire, South Stafford, and Warwick, they are 

 found to be more or less unconformable to those below. This is 

 markedly the case in the Coalbrookdale district of Shropshire, 

 where the whole Carboniferous succession is as follows : 



Feet. 



Upper fRed and purple sandstones and marls (?Keele Beds) 800 



and I Mottled clays and greenish grits with a limestone 

 Trans. C.M. [ containing Spirorbis (Freshwater Beds) . . 440 



Middle Coal-measures with a band containing marine fossils . . 600 

 Lower Coal-measures or Millstone grit, thinning out south . to 100 

 Avonian limestones and shales (Productus gigantcus) . . to 180 



The lower beds, including the Middle Coal-measures, lie in a 



