Mr. Farey’s Notes on Mr. Bakewell’s Geology. 261 
P.273, 1.7, red siliceous sandstone*.—* Red Marl and its oc- 
casionly imbedded Gritstone, see my 2d Letter, xi. p. 100. 
1. 8 and 9, surrounded by this rock+.—+ By Red Marl, 
see my Note on p. 268. 
1. 10, in clay pits¢.—t{ In alluvial red and brown Marl 
Pits, Rep. i. 456. 
1. 14, the red rock**.—** Gritstone imbedded in Red 
Marl, on which last (with very trifling exceptions, besides its 
‘imbedded gritstones), I travelled last summer from Shrews- 
bury to Bolton, on the N of Lancaster, as mentioned in my 
Ist Letter, v. xlii. p. 53—so far are the “ shale (or shivers),”’ 
and the “ Millstone Grit” of Whitehurst, anda ‘¢ district of 
millstone grit and shale,” from being real, which are shown in 
a Map, and mentioned in your xxxviiith vol. pages 27() and 
275, or the incumbent “rock or shale which forms the ° 
basis of the district,” p. 276, &c.—See also my Queries 
thereon at p. 237, which have not been noticed, that 1 am 
aware of. 
1. 23, at Castletont+.—tt See my 2d Letter, vol. xlii. 
p- 113, and my Note on p. 48. 
274,1.1, the red sandstone of Chester*,—* Red Marl (and 
its imbedded Grit, Gypsum, Rock Salt, &c.), Rep. i. 147; 
and no notice is taken here, of the intervening Limestone 
Shale, 1st Grit and Coal-measures, shown in my Map, p. 97 
of Rep.i. p. 172: unless, in the new terms of Mr. B. they 
are all ‘* sandstone,” see my 2d Letter vol. xlii. p. 103. 
1. 4, limestone in’ Flintshire +.—+ The improbable idea 
of some common Miners in Derbyshire, which I have often 
heard, and as is mentioned by Mr. B. at p. 220, that the 
individual Mineral Veins of Derbyshire, extend into North 
Wales, is not sufficient, or anything else which I have met 
with in Mr. B’s work, to show the Limestone Rocks of these 
two distant Mining districts, to be the same. [n your xxxixth 
vol. p. 427, I have suggested, that the Limestone Rocks 
underlieing Coal-measures in North and in South Wales, 
are the same, and I can now add, that I believe the same 
can be traced nearly through all the intermediate Country 
(as the upper of three Limestone Rocks, seen near Ludlow, 
as mentioned in my Ist Lettei, vol. xlii. p. 53, and which I 
wish to name the ‘ Halkin” Rock), with some local inter- 
ruptions from Denudations, Faults, and Gravel coverings, 
and the same into and across Anglesea, proceeding south- 
westward, 
[To be continued. ] 
R3 LIV. Facts 
