21G 



REPORT — 1902. 



Report hy Mr. J. T. Stobbs, F.G.S., on his Work in the Pendleside 

 Series, Castleton District, Derbyshire. 



This series forms a passage from the Carboniferous Limestone to the 

 Millstone Grits, and the transition both downwards from the Grits and 

 upwards from the Massif is strikingly shown in this district. The thick 

 grits may be observed to get thinner (and finer in texture), whilst the 

 intervening shales get correspondingly thicker in descending order till the 

 basal sandstone is reached, when the Pendleside series terminates. 

 Starting from the Massif upwards the intermixing of chert beds and 

 limestone may be observed at Little Huckley, the upper limestones being 

 black and unfossiliferous with thin {\ inch) beds of shale intervening! 

 The limestones become separated by greater thicknesses of shales (as at 

 Bradwell) and are frequently represented throughout the entire series 

 either by their unfossiliferous bands, limestone shales, or bullion beds. 

 Lithologioally the series is very distinct, being typically black or dark- 

 blue shales except the intervals measured by tlie limestone bands or bullions 

 which weather a khaki colour. Towards the middle of the series the 

 limestone bands pinch out laterally in a somewhat erratic manner, which 

 detracts from their utility for stratigraphical purposes. 



The upper portions of the series ai-e seen in good sections, notably at 

 Mam Tor, the river Noe above Upper Booth and north of Hope, and in 

 the stream called Harden Clough. In the bed of River Noe (which runs 

 in the series from half-mile W. of Lee House to about a mile N. of Hope) 

 the succession is somewhat difficult to make out owing to faulting and 

 folding. The lowest members of the series may be observed near Bradwell 

 village and, I think, in the bed pf River Noe from below Edale Mill to 

 I mile E of Booth. 



