Mr. Farey’s Notes on Mr. Bakewell’s Geology. 33 
[P.176] secondary rock, p. 166] by sandstone on the other 
side.”” 
Now it is evident, from page 166, although the 
mention of Derbyshire is omitted in describing the 
magnesian range, from Nottinghamshire to Northum- 
berland, that the ower yellow Lime Rock, is here in- 
tended, and that the sandstone mentioned aboye, must 
mean the stratum next under the lower ycllow Lime, 
(often-appearing as a Sand, hut sometimes also as a 
thick Sandstone Rock, see Rep. ii. p. 410, Note); be- 
cause, otherwise, either Coal strata would occur on both 
sides of [above and below] his Gypsum if placed lower, 
or if Mr. B. referred to the wpper yellow lime, and made 
his Gypsum belong to the intervening Red Marl, which 
T have lately traced between these rocks (P. M. xxxix. 
p. 104), then ‘* earthy limestone” would occur [be- 
Jow] on one side of it instead of Coal strata; and thus 
therefore it should seem, that Mr. B. would persuade 
*‘the disciples of Werner,” to place the Chellaston 
Gypsum, and its incumbent Red Marl, next above the 
Derbyshire Coal-measures, and under the yellow Lime 
Rock, which covers them!—But has any Collier, 
sinking through the Limestone to work the Coals below, 
(as several do) ever seen an ounce of Gypsum ?, or has 
such anywhere been found at its basset ?, or even Red 
Marl, which might contain it?. 
What the sandstone (or Gravel Rock, Rep. i. 132) 
west of Nottingham, has to do with the Gypsuin of 
Chellaston Hill, in Mr. B’s Note, p. 176, might puz- 
zle a much better educated Geognost, than | pretend 
to be. 
]. 12 and 43, in the gravel and marl ¢.—¢ Marl has 
here been inserted by mistake, see my 2nd Letter 
(p- 105) and note on page 175. 
1,15, a distinct formation {.—t The mistake on 
which this supposition is founded, is-pointed out as 
above, see Rep. i. 147. 
177, |. 3, over chalk *.—* When the principles and 
practice of Mr. William Smith and others, in explor- 
ing and tracing the strata, shall be extended to theg 
Continent, which hitherto has very imperfectly been 
the case, as it would appear, from the large Map of 
the strata around Paris which was lately published, the 
calcareous strata here alluded to, and doubtless many 
others above them in the series, will, I think, be very 
extensively traced, in connection, as well] as seen in iso- 
Vol, 43, No, 189, Jan, 1814. C lated 
