the great Derbyshire Denudation. 249 
als well as south of it in Staffordshire, Derbyshire, and Not- 
tinghamshire, as abovementioned, and on the east of it from 
Nottingham to Thorne in Yorkshire, and perhaps further 
northward. 
This border, or plain of red marie, has the tract within it 
so raised, that the yellow, or magnesian lime rock, probably 
abuts against the marie at the surface of the strata on the east 
side, under the gravel, &c. from near Nottingham to near 
Wetherby in Yorkshire. From Lenton E. of Nottingham, to 
Allestry N. of Derby, the upper parts of the coal-measures 
in the first raised tract, abut on the red marie : here another 
great fault, called the zig-zag fault, intersects the boundary 
fault ; from Allestry to the SE. corner of the Weaver Hills 
near Wooton in Staffordshire, the second inner tract, with a 
vastly greater rise than the first, abuts on this southern fault, 
so as to bring .the great limestone-shale (which underlays all 
the coal-measures) against the red marie on the surface ; at 
this SE. corner of the Weaver Hills, another great fault 
(called the great limestone fault) intersects the southern 
boundary (or great Derbyshire) fault of the raised tract; and 
from this place to the SW. corner of the Weaver Hills near 
Ramsor, a third inner tract, with four hundred yards or more 
of perpendicular rise, in addition to the last, occasions the 
fourth, or lowest limestone rock, to abut against, and even 
make a high hill above the red marie at the foot of it, on the 
other side of the great Derbyshire fault ; which here occa- 
sions a sudden derangement of the strata (and a correspond- 
ing denudation of the large tract of country to the northward 
has taken place), far exceeding any thing which has hitherto 
been mentioned by authors, or conceived probably by any one. 
mdcccxi. K k 
