efi 10%) J 
XVIII. Observations, in Objection to some new Arrange- 
ments, and Simplifications of the Strata of England, pro- 
posed by Mr. Bakewrti.—A Defence of the Reality 
and Circumstances stated, respecting three great Faults 
or Dislocations of the Strata in and near Derbyshixe— 
On Mr. Siuverwoon’s intended Section of all the Der- 
byshire Strata—On Mr. Harr’s Survey and Models of 
the high Peak of Derbyshire— The Slate of Charnwood 
Forest not stratyied,sc.ioc. By Mr.Joun Farry Sen. 
To Mr. Tillich. 
Sir,— Tx my first letter (of the 16th inst. p. 53) I replied 
to Mr. Bakewell’s observations, in your xlth volume, p. 45, 
and in his ‘‘ Introduction to Geology,”’ respecting Geolo- 
gical Maps of England, and Limestone Rocks resting ou 
Slate. 1 proceed now to notice what he has said in p. 46, 
and in his Geology pages 212 and 283, in objection to the 
existence of two of the principal Fuwds or dislocations of 
the Strata in and near Derbyshire, which I discovered du- 
ring my Survey of that district in the years 1807 and 8, and 
have described them in my Derbyshire Report, vol. 1. 146 
and 165, and have shown them in the Map p. 97, and in 
(hat which accompanicd a paper in the Phil. Trans. for 
i8il, and your xxxixth volume, p. 26. 
In your 46th and 47th pages, Mr. B. had contrived to 
‘mix his observations on these two faulis together, and so to 
multiply questions to me and suggestions of bis own, that * 
I was quite unable to fathom his meaning, until I came 
to read his Geology, when these mysteries were partly 
cleared up, by the discovery, ‘that almost throughout his 
Geology Mr. B, rejects my term Limestone Shale or great 
Shale, for the vast stratum between the Ist Lime and Ist 
Grit, of Derbyshire, and he substitutes for it “* Sandstone,’ 
see p. 48 and (No. 5) fig. 1 in Plate If, p.93, p. 135, p. 226 
and (No. 4) fig. 5, in Plate If; on other occasions “ Shale 
Sandstone,” p. 1413 and on others, & Shale Grit,” p. 270, 
p- 271, p. 272, and p. 273. The word Shale rarely finding 
a place in his Geology, either here, or in mentioning Coal- 
measures, except when adjectively applied to the terin Sund- 
stone. In his Lectures, he is made to describe it as “a dark 
reddish-brown Shale,” in yopr xxxixth volume, p. 469. 
I next discovered, that instead of the term Red Maré, 
for the well known, bright red marley strata, often irregulay- 
ly streaked with light blue earth, (occasionally imbedding 
masses 
