224 Dr. Cooper on Volcanoes 
Basalts burn contiguous substances. M. Voight in his 
maine journey to the mountains of Hesse, says that 
en the coal and nani is a.thin argillaceous layer; but 
the bal has manifestly been acted on by the heat of the in- 
cumbent Lava. Breisl. § 703. Sand stone acted on by 
and converted into Jasper for ten feet, by pervading and 
moneonnelies basalt just like that of the iron surfaces. 
Haussman. 704. Same phenomena observed in an 
Hiacsey weer oar by Messrs. Conybeare and Buckland. 
Ib. Also by M. Hoff near Suhl: and by Prof. Playfair at 
Salisbury Craig. ‘The same circumstance observed also by 
Whitehurst ia relation to the Derbyshire Toadstone. See 
Theo. of the Earth, 197,198. The same observations by 
Brande as to the coal at Fairhead. Cat. of the Min. of the 
Roy. Inst. p. 184, 185. 
Basalt burning coal and also contiguous limestone, 4 Geol. 
trans. 102. See also to the same purpose, 3 Geol. trans. 
99, 201, 205, 213, 257. Sandstone converted by Basalt 
into Hornstone and black shist into black lydian stone. Ib. 
To the same ee nari Catalogue, p. 171, 179, 184. 
Hard chalk converted into granular marble for upwards 
of ten feet. 3 Geol. tr. 172. So, of Lias Limestone. Ib. 
_ Coal deprived of its bitumen and chaited 4 through a 
layer of interposed sandstone. Ib. 257. Limestone chrys- 
tallized by the Cleaveland Dyke. Bakewell, p. 272. The 
same sce produced artificially by Sir James Hall : Edin. 
tre v. 
The basalt dyke on the Yorkshire coast, forty feet thick, 
running sixty or prea miles on the surface from Cockfield, 
ellin the County of Durham, to the river oe s, near Pres- 
ton, Lestasiiens Then entering Cleaveland in Yorkshire, 
is traced to the coast where it is lost about Blea Hill, near 
a blue oe owerscone ane oxy 
tals. "The seam hand in Durham, where the dyke cuts 
it for some feet distance, is turned into a sooty substance, 
— becomes a cinder, as the —— from the whin- 
stone, (Basalt,) increases, until at fifty yards it assumes the 
appearance of coal, 214 Tillock’s Mag. for March, 1818. 
Greenstone, deprives contiguous coal of its bitumen, even 
