and the Strata, ^c. in Derly shire. 205 



ihe zigzag Fault to near Kirk-Hallam, and then enters on 

 a lower part of the Series : it originates on Coal-measures 

 W of Heanor. 



The Mease River falls into the Trent north of Croxall, 

 in a wide Excavation in Red Marl partially filled with sandy 

 Quartz Gravel, which extends up the Vale of the Mease a 

 little above Croxall, from whence the Vale is excavated in 

 Red Marl, with occasional patches of Quartz Giavel on it, 

 sometimes in Derbyshire and sometimes in Leicestershire, 

 to near the Aqueduct-Bridge at llot-Wharf, WSVV of 

 Measham, near which a great Fault is crossed, and the Ex- 

 cavation enters the Ashby-de-la-Zouch Coal-Ficld, and in 

 which it is cut, principally in a Red Clay, on which this 

 River originates, on Smithshy Connnon N of the Town. 



The Senct is a River of Leicestershire, which falls into the 

 Anchor N of Atherstone, and whose waters are conveyed 

 thence by means of the Tame, into the Trent, which is 

 here mentioned, on account of its draining the detached 

 parish of Ravenstone belonging to Derbyshire, in which 

 the Valleys are mostly excavated in Red Clav belonoing to 

 the Ashby-de-la-Zouch Coal-Field. ' ^ 



The above description of the Beds or lowest Excavations 

 of the principal Valleys in and near Derbyshire, will I trust 

 be found useful, and important to observers of the Stratifi- 

 cation and Minerals, of ibis curious District : it would hava 

 been desirable, to have mentioned the series of strata in the 

 sides of the Valleys in more instances, but for the unavoid- 

 able attention to brevity in this place ; vet as the tops of the 

 Hills are ascertained in so many i)laces, by the List at 

 page 16, and the sides of the more remarkable Valleys, by 

 the List, page 64, it is hoped that no serious difficulties 

 will occur, to prevent the understanding and examinina; of 

 the explanation which 1 have ottered herein, of the Scib- 

 terranean Geography of the District, novel and difficult as 

 the attempt may appear. 



The Rivers of Derbyshire are tolerably supplied with Fish, 

 as will be further noticed in the beginning of Chap. XVl.: 

 they are not much infested bv V/eeds, owiuir to the rapidity 

 in the currents of most of them, yet none of them are per- 

 manently thick or discoloured. 



Jt has been often remarked, that some of the Rivers of 

 this District are warmer than usual, and rarely freeze, the 

 Derwent in particular, owing as it is said, to the many 

 warm Sprinsjs which vent into them: when however the 

 very inconsiderable quaniity of such warm Spring Water 

 and its small clevatiou of temperature is considtrtd, as also, 



that 



