as lo the upper Basaltic Stratum. 359 
of the “ Great Whin Sill,” or upper Basaltic Stratum, mterposed 
in the lower part of the Coal-measures or Lead-mine Series of 
Durham, Northumberland, &c.; and for his promised intention 
of giving Answers, to others of the Questions which I have taken 
the liberty of putting, through the medium of your pages, as to 
the Stratification of these northern parts of the Kingdom, with 
which I was in a degree aware, that he had a practical and inti- 
mate acquaintance. _ Satisfied of Mr. W. F’s kind desire and in- 
tention, of fully and completely answering my questions, I shal! 
offer no apology, for troubling him with a few remarks, suggested 
to me by his Jast communication, partly in the. way of modifica- 
tion of myQueries, in pp.122 and 252 of your last volume, in con- 
sequence of the new light that is now threwn on the subject ; 
with some further Queries, for more clearly ascertaining the facts 
of the Strata, in the parts alluded to. 
Ist. I now I think clearly perceive, from Mr. W. F’s Answers, 
and what has been published by Mr. Winch and Mr. Buckland, 
in the Ist part of vol. iv. of the Geological Transactions, that 
the Basaltic Stratum, of which Mr. Winch shows so long a range 
of the northern basset-edge, in his excellent Map in the Geo, 
Trans. really underlies all the tract of Country to the South of 
it, into Yorkshire, and to the SW and W, into Westmoreland and 
Cumberland; except, where approaching nearer to the surface, 
on the tops of Strata-ridges or bumps, or where it has been 
locally lifted by Faults, its covering Strata have been locally 
stripped off or denudated; viz. 
_ On the Tees River, from near the foot of Crook Beck, or 
of Trent Beck, (opposite the head of South Tyne River,) down 
to near Winch-Bridge : again, in the lengthened irregularly oval 
space, between a point somewhere E or NE of Melmerby on the 
N, and a point somewhere E or SE of Murton on the S (the 
precise ascertainment of which points is of very considerable 
consequence, as intimated in my 2d Query, at top of p, 124), 
to the eastern verge of which last denudated Tract, Mr. Forster 
has now traced this upper Basalt at Highcup Nick, and great 
Rundale Beck; again, in a local throw-up near Tynehead Smelt- 
ing-house (of which more presently): again, perhaps, at Dufton 
Fell (see further on): again, near the Town of Stanhope: again, 
perhaps, near Eggleston on the Tees, (quere any thing more than 
a Dyke, Geo. Trans. iv. 73)?; and again, perhaps, near Riccar- 
il (Geo. Trans. iv.108)?; as I suppose, in the southern branch 
of the Raven Rivulet, near Selah ?, there being no such place or 
stream as Riceargil, marked in any of my Maps: and again, 
deep in the sinking at Alstone Moor. 
To which list of detached local patches of the upper Basalt 
Stratum, appearing on the surface, or proved underground by 
Z4 the 
