166 MR. C. FOX-STRANGWATS ON SECTIONS ALONG THE [May 1 898, 



is again reached. The following details of the coal were measured 



at this spot : — 



Section at Hadt Plantation. 



Feet. luL'hes. 

 Shale with many bauds of ironstone. 



Coal ' 3 



Shale '2 6 



Coal 2 8 



Shale 2 10 



Coal 1 3 



Shale 1 10 



Coal 1 3 



Shale 1 



Coal with a parting o 



In the cutting between here and Spital two coal-seams are seen, 

 the uppermost of which is about 6 feet in thickness ; it is intersected 

 by a small fault, as shown in the accompanying figure : — 



Yig, 5. — Section in cutting west of Hady Plantation. 



a =■ Sandstone, which passes very abruptly eastward into shale. 



b = Shales. 



c' =z Coal-seam, 6 feet in thickness. 



cZ = Sandstone rising in a great floor on the other side of the cutting. 



e =:Fault, with easterly downthrow a little less than the thickness of the coal. 



The bed of sandstone in the upper part, on the east side, ends off 

 very abruptly in the same manner as that noticed at Long Duck- 

 m ant on. This appears to be a peculiar feature in these Coal- 

 Measure sandstones. It is very ditferent from ordinary thinning 

 out, and is probably due to the effect of strong currents during the 

 deposition of the beds.^ 



The dip here has turned round more to the south, causing very 

 extensive slips on the northern side of the railway. In fact, nearly 

 all the upper beds have slipped over the basement-sandstone shown 

 in the figure, so that the dip-slope of this bed now forms the surface 

 of the cutting on the northern side. 



From this point the line passes over a lofty embankment into the 

 town of Chesterfield, and no more sections r.rc exposed. 



^ An illustration of a similar instiince is given in the Gecl Siirr. Memoir 

 on the Yorkshire Coalfield (figs. 5 & 6, p. 1(5), only in the present case the 

 shales are not inchned. 



