I9<? Mr. Farey's Aciount of the Rivers 



2nd Toadstone*, as shown in ihe Section in PlateV. facing 

 page 129, see also page 243 ; the main trunk oi the Der- 

 went being here deeper excavated in the series ot Strata, 

 than in any other part ot" its course. Near the north end 

 of the High Tor, the 2nd Lime Rock again crosses the Ri- 

 ver to the west, and the 1st Toadstone also, and the River 

 runs in or upon the Isl Lime Rock, until about half a mile 

 above Matlock Bridge, when the same gets again npon the 

 great Limestone Shale (as below Cromford Bridge and be- 

 low Miliord Bridge), and continues for nianv miles to run 

 in deep excavations in this Shale, and the Shale Giit-stone 

 which it sometimes contains (except touching: a denudated 

 patch of 1st Lime in Wensley, opposite Dariey Church, 

 see p. 243), and having massive Clitls, often, of the Ist Grit 

 in the heitihls above the River, until near its source upon 

 this 1st Grit Rock, at the place called the Trough on the 

 Grand Ridge, at the Bounds of Yorkshire, as mentioned 

 page 4. 



I shall now proceed to mention brieflv, the principal 

 Strata traversed by each ot" the smaller Rivers branching 

 from the main trunk of the Derwent above described, in 

 order as above, viz. 



The Booile Rivulet or Brook, joins the Derwent S of 

 Little-Eaton, its course thence up to Coxbench being near 

 to the great zigzag Fault, upon the upper part of the Coal 

 Series; at Coxbench it crosses the 3rd Grit Rock, then the 

 3rd Coal -shale, the 4lh Grit, and so on ascending the Series, 

 to its source, near Ri|)Iey Town; and ils branch from 

 SiTialley also, ascends the Series towards its course. 



The Amber River empties itselF into the Derw ent at Toad- 

 moor Bridge, upon the Limestone Shale, and continues 

 therein and in Shale Grit-stone, until E of Bull-bridge 

 Aqueduct; it then crosses the Ist Grit (with a rapid E dip), 

 and then the 1st Coal shale, 2ud Gnt, 2nd Coal-shale, &:c. 

 to Fenirich-lane, where it has got upon the 5th Grit or 

 higher, when turning northward, its course follows nearly 

 the edges of the same Strata to Ford, NVV of Higham, 

 where it turns NVV and crosses the 4th Grit, the 3rd Coal- 

 shale, 3rd Grit, &c. until near Mill-town its Excavation 



• The late ingenious Mr. John Whitehurst, erred in asserting', in both 

 editions of his" Inquiry concerning the Eaith," that the Derwent here runs 

 en loose and broken stutT", lietvveen the 2nd and the Ist Toadstone (see also, 

 the Translation of Werner's " New Theory lif Veins," Supplement, p. 234) ; 

 since the publication ti Mr. W'hitehurst's Work, the Miners having driven 

 a Gate across under the Rii-er,)n solid and unbroken Measures. — See the Phi- 

 Icaophical Magazine, vol. Xixi. p. 3G. 



' crosses 



