and the Strata, ^c. in Derbyshire. 197 



crosses the 1st Grit, and enters the highly curious flenudated 

 Dale of Ashover, descending the Series on to the Limestone 

 Shale, 1st Lime, and 1st Toadstone, which is excavated for 

 near a mile (see p. 171 and 24 ■2), and then its course ascends 

 to the 1st Lime, the Limestone Shale, the 1st Grit, near 

 Bowers Mill, and takes its rise on the 1st Coal-shale, near 

 to Moor- Hall in Ashover. The other main branch of this 

 River, from Toad-hole Furnace eastward, conlinues to 

 ascend the series of Coal-measures, till crossing the zigzao^ 

 Fault W of Sutton in Ashfield in Nottinghamshire, it has 

 its source from the edge of the yellow Lime. 



The Mnrledge Rivulet or Brook, falls into the Derwent 

 in Derby Town, on Red Marl and Gravel, its various rami- 

 fications being excavated in Red Marl, except its several 

 extreme northern branches, which cross the great Derby- 

 shire Fault, between AllestryTown and Mansel-park,- and 

 are excavated in the great Limestone Shale, or in the Quarts 

 Gravel with which it is there locally covered. 



The Eccleslurn River falls into the Derwent at DufEeld 

 on the great Limestone Shale, and in which it is excavated, 

 through all its ramifications, except that, at its sources near 

 Wirksworfh, these Excavations extend into the 1st, and the 

 3rd, and 4lh Limestones ; and that on the south of Turn- 

 ditch, a local patch of the Shale Limestone is cut and laid 

 bare by a branch of these Excavations, see p. 230. 



The Bradford and Lalhkil pour their united streams into 

 the Wye, west of Great Rowsley, near its junction with the 

 Derwent, on Limestone Shale: through which they are 

 soon excavated, so as to lay bare the 1st Lime Rock below 

 Alport (see page fi8), where the Lathkil and the Bradford 

 meet, on a bed of Tufa, as observed page 438 ; from hence 

 the course of the Bradford proceeds westward in the 1st 

 Lime Rock, which it cuts through on the SVV of Yolgrave, 

 and lavs bare the 1st Toadstone for a short space (see page 

 243), when it crosses the great Bakewell Fault* (see p. 291, 

 Note), and again ascends the Lime and skirts the Shale, 

 which it ascends near Gratton, taking its rise upon this 

 stratum near Elton. The La/ZJi"?/ Excavation pursues the 

 J St Lime to the south side of Over-Haddon, where it de- 

 scends the Series on the 1st Toadstone, cuts through it, and 

 lays bare a patch of 2nd Lime, as mentioned, page 243 ; 

 but which not being excavated so deep as the Toadstone 

 below, occasions a sudden fall in the River, whose course, 

 after crossing the great liakewell Fault (see p. 291, Note), 



• [See page 34, and plate I. of my present voIum«.-»'EDiToiu] 



N 3 again 



