An Account of the Great Derbyshire Denudation. 33 



to the W. side, and again to the E. side of the Grand 

 Ridge^ of the island, passes near Sparrow-Pit, Perry-foot, 

 Odin-Mine, Lane-head, Castleton Town, Pindale, Eding- 

 tree, Bradwell, Hazlebadge, Quarters-house, and Windmill- 

 houses, and terminates in the first lime rock between Ward- 

 lovv-Mires and Litton in Derbyshire. If now a line be 

 traced on the same first lime rock, through Wardlow, W. 

 of Little Longsdon, W. of Ashford, through Sheldon, 

 Callenge Low, Middleton by Yolgrave, S. of Gratton, 

 Elton, VVinster, Wensley, and Snitterton, W. of Matlock 

 Church, Siarkholmes, and Wilkrsley Castle to Croniford 

 Town, shown by very fine dots in the map, this line on the 

 first limestone, may be considered as a kind of hinge, or 

 joint, on which the second inner raised tract, and the third 

 inner raised tract have turned a little, and altered their in- 

 clinations with respect to each other and the surrounding 

 tracts (without any vertical derangement at this hinge), so 

 that the great limestone fault above described, from Mid- 

 dleton by Wirksworth, round to the westward through 

 Staffordshire, as above, to Quarters-house near Great Huck- 

 low (with the exception of the short distance between Woo- 

 ton and Ramsor, and some other trifling ones) has the 

 limestone-shale (or the shale-limestone, &c. belonging to 

 it) on its outside on the surface of the second inner raised 

 tract, for more than fifty miles; but on its other side, owing 

 to the great tilt or rise of the western side of the third inner 

 raised tract, if we begin in Cromford, and pursue the course 

 of the great limestone fault, up Bonsai-Dale, we have at 

 first the first lime on its right or N, side (as well as on its 

 S. side), then the first loadstone, next the second limestone, 

 then the second toadstone, and after its turning to pass 

 through Middleton by Wirksworth, the third limestone 

 also abuts against it, and continues so to do, till the third 

 loadstone appears against it at Hopton, and then the fourth 

 limestone, or lowest known rock of the district; abuts against 

 it all the way round, through Staffordshire to Castleton (with 

 the exception of the hummocks of third limestone at Bux- 

 ton and at Barmoor in Peak Forest, and a few sunk gulfs of 

 shale) through a length of more than forty-five miles. At 

 the S.E. end of Castleton Town, the third toadstone abuts 

 again on the right or S, side of this great limestone fault, 

 and from thence to the S.W. side of the Windmill-Houses, 

 the third limestone abuts against it, then the second toad- 

 stone, the second limestone, the first toadstone, and at 



• See that article in Dr. Rees's Cyclopazdia lately pubUsbed. 



Vol. 30. No. J 65. Jan. 1812. C length 



