234 ON THE GEOLOGY OF THE NORTHERN PART 
be composed of gritstone or shale, except when any of these rocks 
may be concealed by the overlying beds of the new red sandstone. 
Beginning, then, at Berrisford Hall, near Hartington, the boun- 
dary of the mountain limestone runs by Narrowdale to Gateham, 
whence it sweeps round to the north, along the flank of Ecton hill, 
up to Warslow. From Warslow it runs with an undulating line 
to the west, to a point about one mile beyond Upper Elkstone, 
whence it deflects to the S. running nearly in a straight line S.E. as 
far as Waterfall and Waterhouses. From this point it sweeps round 
the bold hill of Caldon Low and along the S.W. flank of the Wea- 
ver Hills to Ramsor, whence it turns to the N.W. and enters Der- 
byshire again near Thorpe, at the extremity of Dove Dale. 
The principal coal-measure district is that called the Pottery 
coal-field. This has a triangular form, the apex of which is at Bid- 
dulph, the eastern side running thence in a nearly straight line to 
the eastern corner of the town of Lane End; while the western, 
after sweeping round the southern extremity of Mole Cop, and en- 
closing Talk-o’-the-Hill, passes through Audley to the neighbour- 
hood of Madeley manor house. The base runs from Madeley ma- 
nor house, S. of Newcastle, to the S.E. corner of Lane End afore- 
said. A much smaller district, which may be called the Kingsley 
or Cheadle coal-field, has a somewhat similar shape, the apex of 
which is at Ipstones, the eastern side passing by Froghall to near 
Oakamoor, the western running to the west of Dilhorne, and the 
base being an irregular line passing from the neighbourhood of Dil- 
horne, by Delph Houses, to the S. of Cheadle, and thence by Hales 
Hall to the Churnet, just N. of Oakamoor. In the northern corner 
of the county are several small tracts, where coal is worked, either 
on the back of the gritstone hills, or in the hollows made by the de- 
pression of their beds. Of the latter a remarkable instance occurs 
about half way between Leek and Buxton, about Goldsitch, where 
is a small patch of coal measures about 13m. long by 3m. broad. 
It remains now to notice the distribution of the new red sand- 
stone. Beginning at Ashbourne, this rock will be found running 
up the valley of the Dove in a narrow tongue, forming the middle 
of the valley and also the sides, up to a certain height, as far to the 
N. as within a mile of Thorpe. Having crossed the valley of the 
Dove, the boundary of the new red sandstone is found to run 
towards the S. at the back of Church Mayfield, but shortly to turn 
N. again, and run in the same manner up the little valley that comes 
down by Stanton, that it does up the valley of the Dove. From 
the bottom of this valley the boundary is more regular, running N. 
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