of Derbyshire and Notts Coalfield. 295 



an additional east and west fault, or faults, having a considerable 

 upthrow to the south, in the 1^ miles of unproved ground north of 

 the Euddington borehole. 



Oulncell Colliery, Ilkeston. (Fig. 1, Section II.) — The workings in 

 the Kilburn Coal at this colliery having recently encountered a fault 

 with an upthrow of 95 yards, the opportunity was taken to try the 

 Ganister Coals by means of a trial shaft sunk from a level driven 

 through the fault. The Naughton and Alton Coals were proved. 

 The section closely agrees with the Kilbourne section, and confirms 

 my reading of the adjacent Little Hallam Boring. 



Underlying a bed of white clunch, 37 feet above the Naughton 

 Coal, was a shell-bed with numerous specimens of Carhonicola acuta 

 and C. aquilina. 



The Alton Coal, with its marine bed roof, showed the following 

 section : — 



ft. in. 



Black Shales (marine bed) . . . . 14 



Coal 1 11 to •2 ft. 4 in. 



Ganister floor ) „ „ 



White fireclay | • • • • • • 



The black roof-shales are crowded with flattened fossils, and contain 

 large calcareous and pyritous nodules in which perfect uncrushed 

 fossils occur. The following were collected : — 



Lingida mytUoldes. Bimorphoceras Gilhertsoni. 



Ftcriiiopecten papyraceus. Pleuronaiitilus sp. 



Posidoniella Iccvis. Orthoceras (more than one species). 



P. minor. Elonichfhijs sp. 



Gastrioceras carbonarium. Megalichthys Hibberti. 



G. Listeri. Acanthodes sp. 



G. coronatum. 



General Considerations. 

 1. Comparison with the Yorkshire Coalfield. 



The Kilburn Coal. — This important seam is an excellent house-coal 

 throughout the southern portion of the Derbyshire Coalfield, with an 

 average thickness of 5 feet on the western and southern outcrops, 

 but diminishing locally in tlie workings on the easterly dip. It has 

 not yet been proved under the Trias of Nottingham. Traced north- 

 ward the seam thins away to less than 2 feet in the Chesterfield area, 

 and further north it is represented only by its underclay. In the 

 southern portion of the Yorkshire Coalfield an underclay occurs on 

 the same horizon, some way above the Elland Flagstones, while 

 north of Huddersfield the Better Bed Coal comes on over this under- 

 clay ; and this coal, like its equivalent the Kilburn Coal, is 

 immediately overlain by a ' bone- bed ' composed of fragments of 

 fish-remains (9). 



The WingfieU Flagstones. — The bold feature formed by the outcrop 

 of this rock is known to extend throughout the whole length of the 

 Derbyshire into the Yorkshire Coalfield, where it is called the Elland 

 Flagstone. The work of Hull and Green, and the more recent work 

 of Gibson and Wedd, has resulted in the correlation of the 

 Elland Flagstones with the Upholland Flags of the Lancashire Coal- 

 field, and with the Woodhead Sandstones of the Cheadle Coalfield of 



