298 JR. D. Vernon — L. Coal-measures, Derby and Notts Coalfield. 



which occurs below the Alton Coal in the Kilbourne shaft, the marine 

 fossils are found to be restricted to the roof of the Alton Coal. 



Conclusion. 



The Alton Coal and its marine bed have thus been proved to persist 

 from the outcrop in Derbyshire as far as Ruddington, 15 miles to the 

 south-east, without showing any signs of thinning away. 



On the east side of the Charnwood Eange borings have shown the 

 Coal-measures to be absent (e.g. at Hathern, 7 miles south-west of 

 Euddington) (12). It would therefore appear that these Lower Coal- 

 measures continue to the south of Euddington and finally end abruptly 

 against the older rocks flanking the Charnwood Eange. 



It is impossible as yet to correlate the Yorkshire and Leicestershire 

 Coalfields since very little is known of the lower measures of the 

 Leicestershire Coalfield, which contains no workable coal-seams. In 

 future explorations it is suggested that search should be made for this 

 Alton Coal marine bed, which would provide a much needed datum- 

 line of prime importance in the correlation of the Leicestershire 

 Coalfield with the other coalfields of the Midland province. 



Owing to the strongly unconformable cover of Trias which conceals 

 the Coal-measures to the south of Nottingham there is always the 

 possibility that future borings may (as at Euddington) unexpectedly 

 encounter these Lower Coal-measures. In such a case it will no longer 

 be necessary, as in the past, for borings to be continued below the 

 Alton Coal marine bed, the explorations described above having 

 definitely proved that in this area the Ganister Coals are of no present 

 value. 



I wish to express my indebtedness to the work of Dr. Gibson and 

 Mr. Wedd, B.A.., as contained in the recent Survey Memoir on South 

 Derbyshire. My best thanks are due to Mr. E. A. jSTewell Arber, M.A., 

 Dr. Hind, and Dr. Traquair for assistance in identifying the fossils ; to 

 Professor J. W. Carr, M.A., and Dr. Swinnerton, of University 

 College, Nottingham, for facilities in carrying out the work and for 

 permission to break up and examine a series of cores from the 

 Euddington Boring; to G. E. Coke, Esq., E.G.S., for further cores 

 from Euddington ; to H. J. Kilford, Esq., the Ilkeston Borough 

 Surveyor, for permission to examine cores from the Little Hallam 

 Boring ; and to P. M. Chester, Esq., General Manager of the Oakwell 

 Collieries, Ilkeston, for kindly allowing me to inspect the new sinking 

 at that colliery. 



Eeferexces. 



1. Gibson, W. " Geology of the Southern Part of the Derbyshire and 



Nottinghamshire Coalfield" : Mem. Geol. Surv., 1908, pp. 183-6. 



2. Green and others. " Geology of the Yorkshire Coalfield " : Mem. Geol. Surv., 



1878, pp. 123-4. 

 -3. Smyth, W. W. "Iron Ores of Great Britain": Mem. Geol. Suit., 1856, 

 pt. i, p. 39. 



4. AsHWOUTH, J. CoU. Guard, vol. Ixxii, pp. 823 and 1111. 



5. Teall, J. J. H. "Geol. of the North StafCs. Coalfields": Mem. Geol. 



Surv., 1905, p. 70. 



6. Kendall, P. F. "Roy. Comm. on Coal Supplies," 1905, pt. ix, App. III. 



7. Gibson, AV., and others. "Geology of the Country between Newark and 



Nottingham" : Mem. Geol. Surv., 1908, App. I, pp. 112-13. 



