18 SKETCH OF THE GEOLOGY OF DERBYSHIRE. 
remains the same. In the next place, seams of coal, which in some 
places are covered by the magnesian limestone, in others come out from 
underneath it, and have a great extent of other beds intervening be- 
tween them and the course of the limestone, thus showing the strike, 
as well as the dip, of the two formations to be unconformable.* 
Lastly, many of the faults of the coal measures run up to the magne- 
sian limestone, and affect the beds beneath it, without producing any 
alteration on that rock itself. The coal measures have frequently 
been traced under the magnesian limestone, but to what extent they 
gois left at present entirely to conjecture. The coal-field is bounded 
to the S. by a very irregular line, which runs from below Radford 
Church S. to Wollaton Park, then turns to the W. and runs close to 
the N. of Wollaton Church, and, after encompassing the village, re- 
turns io the S. nearly as far as the Nottingham and Derby road. 
Here it again turns to the W. and runs along the N. side of the 
Brameote Hills to some quarries near a bridge over the canal, a little 
E. of the village of Trowel. From this point it returns again along 
the S. side of the Bramcote Hills, and through New Stapleford down 
to the old village of that name. Here it crosses the Erewash, and 
runs up its western bank, passing to the N. of Sandiacre into the 
village of Stanton. From Stanton it runs along the ridge between 
that place and Dale Abbey, from the W. end of which village it turns 
N. as far as the Spondon and Kirk Hallam road, when it turns short 
again to the S. and runs along the western side of that road into 
Locko Park, whence it runs N.W. to Morley. Along the whole line 
of country between Nottingham and Morley the beds of the coal mea- 
sures still preserve their general easterly dip, but on approaching the 
southern boundary they invariably get a little bent up in that direc- 
tion, so as to dip to the N.E. and consequently to basset or come to 
the surface towards the S.W. and this they would always be seen to 
do, were it not for the overlying beds of the new red sandstone. It 
is the common opinion that a great fault runs E. and W. from Not- 
tingham to Stanton, and from Stanton to Breadsall; and this is 
marked in Mr. Gratton’s map by straight lines in those directions. 
This opinion, however, requires some modifications. No great fault, 
in the common acceptation of the term, has ever been reached by the 
workings, and in many places the beds continue, without the inter- 
* The strike of a bed means the direction of its run across the country, 
and is at right angles to its dip, or direction downwards into the earth. 
