\ 



1 66 



ILLUSTRATIONS OF THE 



reference to many fp 



the earth's furface 



A few fuch will be fufficient in this pi 



St Gothard 



al point 



in 



of the 



greateil trads of primary mountains on the face 

 of the earth, yet arenaceous ftrata are found in 

 its vicinity. Between Ayrolo and the Hofpice 

 of St Gothard, Sauffure found a rock, compofed 

 of an arenaceous or granuh-ir paite, includir 

 it hornblend and garnets. He is fomewhat 

 willing to give 



which M. Beffor 



6 



the 



gres to th 



Hone 



d done 



b 



lefs defcrib 

 ture*. 



he neverthe 



? 



it as having a granulated Itruc 



Among the moll indurated rocks that com- 

 pofe the mountains of this illand, many are are- 



Thus, on the wellern coall of Scot- 



naceous. 



land, the great body of high and rugged moun- 

 tains on the fhores of Arafaig, &c. from Ardna- 

 murchan to Glenelg, confifts, in a great mea- 

 fure, of a granitic fandllone, in vertical beds. 

 This (lone fometimes occupies great trads j at 

 other times it is alternated with the micaceous, 

 or other varieties of primary fchiftus; it occurs, 

 likewife, in feveral of the iflands, and is a fof- 

 fil which we hardly find defcribed or named 



r 



by the writers on mineralogy. Much, alfo, of 



a 



# 



Voyages aux Alpes, torn. iv. § 1822, 



