106 Mr. Farey’s Reply to Mr. Bakewell—Faults in Derbys. 
Fault is filled with ?: I answer, clay principally, which he 
himself states, p. 208, to be commonly the case in Derby- 
shire and its vicinity, and which J had previously stated 
Rep. i. 500 and 501; and in the latter case, bad answered 
another of his questions, viz. as to, where T had actually 
found the fault 2: in my List of Springs, which follows the 
pages above quoted, he will find several other well known 
points, exactly ascertained, where the Red Marl abuts 
against other strata, far removed in the Series, and in dif- 
ferent degrees; in some of these, in Quarndon village in 
particular, Rep. i. 505, Mr. B. may see this junction on 
the W side of the Hollow Road, without further trouble, 
and may measure its exact breadth,” and may also analyse 
its © mineral matter,” if he thinks they will repay him the 
trouble :—I have been otherwise employed. 
When Mr. B. asked in your 46th page ** how the lime- 
stone has passed over or under this fault, so as to appear 
again with veins of Lead Ore* at Breedon?,” I never could 
have imagined, until I read pages 284 and 275 of his Gea- 
logy, that Mr. B. was here alluding, to an identity between 
the mountain Limestone of the Peak of Derbyshire and the 
Limestones of Breedon, Ticknall, Cloudshid and Grace 
Dieu! It is true, that in page 286, Mr. B. represents the 
Shale Limestone near Ashburne, to be the same as at Wild, 
or Wold Park +, Breedon, Cloudshill and Grace Dieu! 
In a note hereon Mr. Bakewell says, that this shale 
limestone is occasionally imbedded in the thick shale (see 
Rep. i. 229 and 232) which covers the ** dower beds,”’ (I 
suppose he meant upper beds) of metalliferous Limestone ; 
but this shale having previously been assimilated with the 
Red Marl, as observed above, we see again, how my al- 
Jedged Fault appears to Mr. B. to be unnecessary and 
“¢imaginary.”—But surely Mr. B. has Friends in Derby- 
shire and elsewhere, who will, ere long, tell him, that the 
facts of the Derbyshire sirata, differ most essentially, from 
this very “simple arrangement” of his. 
Where the numerous Faults are situated, on the western 
side of Derbyshire adjoining Cheshire, and part of Stafford- 
shire, which Mr. B. alludes to at bottom of page 46, he has 
nowhere told us; in his Geology, p. 211, he seems to ° 
represent the same, as occurring between Yorkshire, Lan- 
* I confess that I never before heard of “veins of Lead Ore at Breedon,’? 
and if Mr. B. could establish the fact. I should still maintain, as I have done 
at p. 427, vol. xxxix. that such are not sufficient marks of the identity of 
strata. 
+ As I suppose, merely on account of their contortions, Rep. i. 231 and 
158, ¥ 
cashire, 
