10 Mr. Buddle's Notice of a Whin Dyke. 



course of the Dyke was found to be about South 45o East here, and the 

 stone drift was driven in a line nearly at right angles to it ; consequent- 

 ly, the stone drift, as shewn in the diagram, No. 1. gives a correct sec- 

 tion of the Whin Dyke, and the strata lining its sides. The following 

 is an account of the strata passed through by this stone drift, commencing 

 at its Western End, see the diagram or section, Plate II., the roof of the 

 seam being a bluesh-grey Metal. 



Thickness. 

 No. 1. — The seam changed into shattered Glance Coal, which is diminished 

 in thickness from its full height, 3 feet 4 inches, into a mere leader by the 

 descent of the blue-grey Metal roof. From the roof a tongue of the blue- 

 grey Metal is protruded into the Coal. 



No. 2. — The blueish-grey Metal roof passing downwards, 3 feet. 



No. 3. — Grey Post, intermixed with crystallized Carbonate of Lime, 7 — 



No. 4. — Black Metal, much mixed with Coal, and semi-vitrified, 6 — 



No. 5. — A singular rock, apparently composed of fragments of Shale or Me- 

 tal Stone, the interstices being filled up with a fine white powder which is 

 nearly pure Alumine, and Calcareous Spar; the Shale composing the sub- 

 stance of this rock, is entirely changed in its nature, differing very mate- 

 rially from the general character of this rock, as met with in our district, 16 — 



No. 6 Basalt, 13 — 



No. 7. — Compact indurated black Metal Stone, 20 — 



No. 8. — Black Metal, with scares of Coal, 15 — 



No. 9.— The same as No. 3, 2 — 



No. 10. — The same as No. 2, 6 inches. 



No. 11. — Coal, same as No. 1. 



It may be worthy of notice that the Dyke has affected the strata on 

 its South West side in a much greater degree than on the North East 

 side, as No. 8 is evidently the same substance as No. 4, but not so much 

 altered in its composition, and the Coal on the North East side resumes 

 its natural state much nearer the Dyke. The most remarkable feature, 

 however, is, that the Black Stone, No. 7, though in immediate contact 

 with the Basalt, seems to be the least changed by the action of the Dyke. 



This section shews clearly that the Whin Dyke does not pass through 

 the Beaumont Seam at this place, but that it merely depresses the seam 

 a few feet below its natural level, thinning it, as if by pressure, into a 

 mere leader, and deteriorating the quality of the Coal. 



