the great Derbyshire Denudation. 251 
yellow lime strata at the top of these coal-measures abut against 
it for short distances, and between Allestry and Little Eaton, 
where the limestone-shale below these coal-measures abuts 
on its W. ; but the rise is very considerable and unequal on 
the N. and W. sides, through its whole length, compared with 
the other sides, as I have particularly shewn in my Report to 
the Board, and pointed out the great difficulties which this 
zig-zag fault has presented, to the right understanding the 
entire of the great Derbyshire and Yorkshire coal-field, by 
the many very intelligent and able colliers who are found 
in it. 
The first, or outer raised tract, thus bounded by faults (ex- 
cept, perhaps on the N. where my Survey has not extended), 
shews no very rapid dips or inclinations of the strata, except 
in very limited spots, and presents on the surface either the 
yellow lime rock, or the parts of the coal-measures not very 
far beneath that rock, compared with the whole thickness of 
these coal-measures. 
The great limestone fault (which has been mentioned 
above) commences in the town of Cromford in Derbyshire, 
in the first or upper limestone rock, and proceeds through 
Middleton, Vvfirksworth, Hopton, Carsington, Baliidon, Par- 
wich, Newton-Grange, and Thorpe in Derbyshire, Ham, 
Blore, and Thornwood in Staffordshire, and joins the great 
Derbyshire fault near Wooton (as abovementioned), with 
which it coincides along the S. end of the Weaver Hills to 
near Ramsor, where it again leaves this fault and proceeds 
near Caldon, Water- Houses, Water-fall, Grindon, Wetton 
Mill, S. end of Ecton Hill, near Gateham and Narrowdale in 
Staffordshire, Wclfscote, Beresford, Hartington, Ludwell, 
K k 2 
