256 Mr: Farey’s Notes on Mr. Bakewell’s Geology. . 
P.48. given any consistent explanation of them?; Mr. 
Allan, in p. 92 of your present volume, ascribes 
the Cornish Hummocks, to decomposition! ; see 
my 2d Letter, (p. 108.) ] 
1, 24 and 25, compact limestone (7)tt.—tt It has | 
already been noticed in my 2d Letter (p. 112), 
that a great faudt (Rep. 1. 289) is omitted in plate 
II, fig. 1, through No. 7, near to the edge of the 
Shale (5); and that the part of the Limestone 
which underlies the Shale here is 1st Limestone 
(Rep. i. 238 and 271). 
491.2, the same limestone*.—* It is the 4th, and not 
the Ist Limestone, which forms mountains to the 
W and SW of Castleton, see Map at page 97 of 
Derb. Rep. i. and p. 280, and my 2d Letter, 
(p. 112.) Ww 
1. 14, different rocks +.—t These effects of Faults are 
shown, Rep. i. 146, 165, 280 and 290 Note, &c. 
Phil. Trans. 1811, and P. M. xxxix. p. 26. 
1. 16, sinking down {.—t Mr. Whitehurst attempted 
to explain the formation of Valleys by fissures and 
subsidences, but his assumptions have been proved 
erroneous, P.M. xxxi. p. 36, and Rep. i. 473 and 
490, and my 2d Letter, (p. 112 N). I have de- 
scribed all the principal Valleys in Derbyshire, and 
shown that they are none of them owing to this 
cause, Rep. i. 469, P. M. xxxix. p. 192 and 253,) 
and Mont. Mag. xxxiil. p. 516. Mountain Tor- 
rents, mentioned here and in p. 189, seem per- 
fectly inadequate to the widening of the upper parts 
of fissures, into valleys, Rep.i. 491, and xxxiy. 
p. 49. 
50,1, 11, fragments of these mountains *.—* The con- 
glomerates of the north of Scotland, mentioned 
in my note on p. 44, are not formed of fragments 
of theadjacent mountains, nor are perhaps any other 
such ‘* pudding-stones,” as‘ they are here called, 
so formed. 
1.19, by marine currents }t.—f This cause assigned 
for the excavation of Valleys, appears rather more 
adequate to the effects, than * Rivers which flow 
through them,” page 47; but neither are suffi- 
cient, to account for the very general denudation 
of the earth’s surface, if they could be supposed 
to have formed the individual vaileys. The same 
cause which denudated, (whateyer it Bi 
een 
