170) Mr. Farey’s Reply to Mr. Bakewell’s Letter. 
what he calls the 4th Limestone, is the same, or at all 
allied, to that 1 have described in Derbyshire? but above 
all, whether he was able to detect, all or any considerable 
proportion of the species of shells and other Religuia in 
the Yorkshire Limestone, that the late Mr. William Martin 
has figured and described in his ¢ Petrificata Derbiensia ? ; 
and that to this call he has remained silent, although in the 
imterval he has published two Letters, and a work of 368 
pages, expressly on the subject of English Geology, 
To undefined cr fanciful ** Geological relations” (p. 124}, 
as well as to the opinions of any Men, whose grounds for © 
the same are not fully known, I pay little or no respect 
(wishing that my opinion, under the same circumstances, 
should receive none), but that a position so supported, 
*¢ may stil safely be doubted,” p. 59, 1 must again repeat. 
It may be useful here, to contrast Mr, B’s Geognostic 
rule (p. 126 herein). ‘* In every district, the lowest rock 
which rises 0 the surface in different parts, may be cons}- 
dered as the fundamental rock, giving the true geological 
character to that district,” with his application of the same, in 
maintaining, that S/aée is the fundamental rock of Burnsal, 
vol. xl. p. 46, and also of the whole Peak of Derbyshire, 
&c. (by inference, although some parts of the 4th Lime- 
stone Rock are more than 80 miles distant from the Slate 
of Ingleborough), because the same; slate) appears(in Chapel- 
le-dale) at the base of Ingleburough (distant 21 miles) and 
in Swaledale, (Ivy Bridge, the nearest place in which Dale, ta 
Burnsal, is distant 22 miles) see Geo. p. 279; yet when 
I have suggested, that the limestone covering Slate (p. 59), 
between Lancaster and Kendal, may be the same as that 
which covers slate in Ingleboraugh mountain (distant only 
13 miles), Mr. B. objects, and says (p. 124), that these are 
different districts, and cannot proye or disprove the ques- 
tion, as to the identity of the Limestones and their sub- 
jacent Slates: and yet in Mr. B’s Geology, p. 281, we bad 
been told, that the Derbyshire Limestone extends into Lan- 
cashire, and rests upon slate! I still repeat, this may fairly 
be doubted, *‘ which is all I contend for,” and bope that. 
the doubt may soon be cleared up, by precise facts, 
Mr. B. p. 124, speaking? of the great Limestone Fault, 
under the title of my ‘* imaginary great fault,” says, ‘of 
which T think he will find it difficult to offer any direct 
proof.’ If, in addition to the many facts stated in my Re- 
port, and through Mr. Hall, p. 113, it be thought, that I have 
offered no direct proof, as to its course on the S side of 
Castleton, [ can fortunately now offer an additional one, 
the 
