All Account of Ike Great Derby shire Denudation. 27 



fied masses, broken and dislocated, and then cut or denu- 

 dated m all the vanetv of cases and degrees of each, the re- 

 sults of which investigation, will appear in my Report to 

 the Board of Aariculiure on Derbyshire, the first volume of 

 which is now ui the press*. 



With ideas thus extended, I found, on resummg mv 

 Survey in the spring of 1808, that some conclusions that 

 I had 'formed, and had unfortunately committed to paper, 

 in a sketch of a section across the county, vvere erroneous, 

 and that immense fauli^ occurred, in places where their 

 existence had not been proved by miners, or generally un- 

 derstood, which combined with the denudations, that were 

 so apparent in mv first journey across the county in the 

 precedmg autumn, offered, as I proceeded afterwards in 

 fiilino; up my map, a considerably different explanation of 

 the sTructure o\ the country, or section of its strata, from 

 that which I had previously made, and permitted some per- 

 sons to copyt- 1'lie first volume of my Report to the Board 

 of Agriculture abovementioned, has compressed into it, all 

 the inosl essential particulars of my Survey, which manu- 

 script you did me the hoiKuir to examine, and to recom- 

 mend i'ts adoption to tiie Board; but as the plan of that Re- 

 port did not admit of taking an extended or connected view 

 of the great faults or dislocations of the district, I have 

 troubled you with this letter, in order to describe them : 

 previous to which it may be right just to recall to your re- 

 collection, a few particulars respecting the British stratifi- 

 cation. It is now well known to grpat numbers of obser- 

 vers, that the thick clay and otlier strata, on which -the 

 metropolis is situated, 'extend eastward through Essex, 

 Suffolk, and Norfolk to the eastern coast, and in all their 

 extent cover the chalk strata : that these again (the chalk) 

 extend from the Isle of Wight to Flambvjrough Head, and 

 cover other known strata, which have their regular basset- 

 edaes, or appearances at the surface, in continuity, to the 

 westward of the limits of the chalk, and of each other ; and 

 thus it has been imagined by many, that the whole surface 

 of England could be referred to, or explained by an unin- 

 terrup'led series of basset- edges of strata, dipping to theS.E. 



* This important volume, to all those interested in the property, the 

 gettiiiR or usinpof tlie principal British Mineral Products, as well as to the 

 Geologist, may now be liad of any bookseller.— Editor. 



+ And which copy, after bcin^' altered so as to deviaie immensely further 

 from the facts of the case, and in despite of the opinions of the most expe- 

 rienced individuals on the line of section, or that can perhaps be found n» 

 any other situation, (see Derbyshire Report, i. p. 103. Note; h*s since, as I 

 am informed, been published. — Ediiok. 



and 



