New Hints as to the Position of Granite in England. 364 
p- 216, Mr. Forster means the same Dyke and Fault, as is spoken 
of by Mr. Winch, as ‘the vein called the Devil’s Back-bone,” 
p. 80 of his paper in the Geo. Trans.? If these are one and 
the same Dyke, in what direction does it range, exactly?, and 
if the regular Basaltic Stratum is denudated by its side (of which 
circumstance Mr. W. gives no intimation) what is the extent 
nearly, of the patch of Basalt which is thus exposed ? 
lith. If the great Level to Dufton-fell Mines, commences ia 
great Rundale Beck, on the great Whin Sill (p. 217), and this 
saine Whin, is either ‘he top Stratum at those Mines, as Mr. 
Winch intimates in p. 62 Geo. Trans., or the top Stratum but 
one (the Tyne-bottom Limestone) as Mr. Forster intimates p. 40 
of his Treatise, (quere which is correct ?); does not the said 
Level, descendingly cut the series of Strata (either dipping to- 
wards the level mouth ? or thrown down all at once bya Fault ?), 
so as to enter this mine, and effect its drainage, at some consi- 
derable depth below the great Whin Sill?. 
In hopes that Mr. Forster and Mr. Winch will spiritedly fol- 
low up, what they have so well begun, and that Mr. Fryer will 
join in their efforts, for elucidating the Stratification of the north- 
ern part of England, 
I remain, 
Your very obedient servant, 
October 20, 1817. A Constant READER, 
P.S. I beg to hint to Mr. Professor Buckland and others, 
who seem, as Geognosts teach, to think that Granite wherever 
it appears in situ, must be “ either a Dyke, or the projecting back 
of a substratum of this substance (Geo. Trans. iv. 110), that 
nothing like a continuous Stratum of Granite has yet been 
proved lo exist in England, as Mr. Farey long ago asserted ; al- 
though, mistakenly (Phil. Trans. 1811, and Derby Report, i. 151), 
he then referred the Granite of Mount Sorrel, &c., to the Red 
Marl; but which Mar! he has since shown to be unconformably 
overlying, there and elsewhere, like the Strata under and sur- 
roundingCarlisle:——to such Gentlemen I say, I beg to point out, 
that there is nothing the least simgular, in the appearance of 
atches of Granite at Bankey-Close, Hindrigs, &c. on the east 
of Appleby, but that the same agrees exactly with the postions, 
of the granile patches near Shap Fell, Carrick and Caldbeck 
Fells (P. M. xlvii. p. 43), near Ravenglass, and again on the 
other side of the Carlisle Trough, at Criffel Hill; all of these, 
and others which I could mention elsewhere, occupying the 
place, or part of it, of the range of the upper Basaltic Stratum, 
which it has been my chief object, in this and several previous 
communications, to trace out and define; and such Granites, do 
not 
