Affinity between Bafaltes and Granite . 
parts of the fpecimen ; and when a violent blow is ftruck, 
the trapp and granite do not feparate, but the fracture takes 
fome other direction. They feem in feveral places of the 
boundary to run into one another. The whole mountainous 
diftri£t furveyed by Mr. Leske * with fuch fcrupulous accu- 
racy affords multiplied examples of the contiguity and connec- 
tion between thefe different rocks. 44 From all thefe minute 
“ defcriptions,” fays the Author, 66 it appears, that the bafe 
44 of the whole range confifts of granite. On the declivity of 
“ the higheft elevations, and on the folitary fummits of the 
44 external chain, corneous porphyry lies upon the granite, out 
44 of which as well as the granite itfelf, and the fandftone at 
44 its foot, bafaltes has been protruded by the force of fubter- 
“ raneous fired.” The manner of connexion will appear 
from a few examples. The bafaltes of the Spizberg J has a 
granulated ftru&ure, and is imbedded in granite. The fub- 
ftance of the pillars of the Gikeliberg § is clofe and granular : 
in fome pieces 44 I found the conftituent grains of granite little 
44 altered.” Of the columns of the Knorberg, 44 the fubftance 
44 is clofe, uneven, and confifts of diftinct grains : . . . large 
64 pieces of imperfectly fufed granite are difFufed through its 
44 fubftance. In the Whinftone of the Hochwald there are 
44 found pieces confifting of a mixture of white feldfpath, 
44 quartz, and black ftioerl ||.” Again, in the Rauberg, the 
conftituent parts of granite are fo diffufed through the bafaltes, 
* Reife durch Sachfen. 
t Ibid. p. 513. “ It is alfo remarkable, that granite in general throughout 
Veiay and Auvergne is frequently intermixed with the bafaltine and other common 
volcanic hills. I have obferved the fame in Italy,” Strange, p. 14, 
% Reife durch Sachfen, p. 32:80 
§ Ibid. p> 498. || Ibid, p, 515, 
I a 
that 
