14 SKETCH OF THE GEOLOGY OF DERBYSHIRE. 
depth, indeed, it tilts the strata quite over; and where the Ridgway 
sough, which comes up from the Derwent, first strikes the limestone, 
the shale is dipping into the hill, or towards the E. instead of the 
W. with the limestone bent back overhead. A little farther N.W. 
the Pearson’s Venture drawing-shaft, after sinking down through 
part of the shale into the limestone, they, in continuing the same shaft 
afterwards, pierced through the limestone and got into the shale 
again, showing the beds to be in the remarkable position given them 
in the section No. 3. 
Crich cliff has long been celebrated for the number and richness of 
its lead veins. As might be expected where such violent disturbances 
have taken place, nearly all trace of regularity in the direction of 
these is lost. In fact, they cross each other at all angles, and run 
towards every point of the compass. It is remarkable, however, that 
they all hade (or dip) into the hill, the plane of the vein keeping as 
nearly as possible perpendicular to that of the beds ; thus all the veins 
have a tendency to intersect each other in the centre of the hill, and 
many of them are found to do so, and I believe that some of those 
which run parallel to each other at the surface unite when they inter- 
sect, and do not again separate. It was in Crich cliffs that the first 
experiment of sinking through the toadstone was attended by success, 
in the discovery of the Glory Vein by Mr. Alsop. There seems to 
be some irregularity either in the number of beds or in the position 
of the toadstone at Crich, as the following sections of shafts, only a 
few hundred yards distant from each other, show :— 
GLORY SHAFT. 
Limestone, containing three thin beds of clay......... 38 fathoms 
WW GHOSLONG EAL scsee wicascasecc-santekoacs sessehenaete as PA ae: 8 do. 
Limestone, to a clay called bearing clay .............-- 37 do. 
Below which the sinkings were continued some depth without finding 
any toadstone. 
places where I examined it in the Pearson’s Venture Mine it was trading to 
the E. in which case it would forin a very rare exception to an almost uni- 
versal rule of considerable practical importance, “that a fault always trades 
or dips wnder the downcast part.” 
* In one part of the Glory Vein this bed of toadstone appears to have dis- 
appeared, leaving only two thin beds of clay in its place. 
