VI. Ati Account of some Geological Facts observed in the Faroe 

 Islands. By Sir George Steuart Mackenzie, Bart. 

 Pr. Ph. Cl. R. S. Edin. 



[Read Nov. 2. 1812.] 



THE singular appearances which were presented to my 

 view by the Trap Rocks of Iceland, and the interest 

 which they excited, made me resolve, as soon as I had given 

 an account of that country to the public, to visit the Islands of 

 Faroe. This expedition was undertaken, for the purpose of 

 ascertaining, whether, in a Trap Country, where no traces of 

 external volcanoes existed, any thing similar to the peculiar 

 features of the rocks of Iceland was to be found. In the latter 

 country were discovered a series of rocks, lying above the beds 

 of Trap, which bore the most striking marks of igneous origin ; 

 in some instances having a perfect resemblance to ordinary 

 Trap, and in others to the common Lavas of the country. 

 The beds of Trap, and those above them, being separated by 

 mechanical depositions of TufFa (Trap-Tuff), led me to the 

 conclusion, that the whole of the beds had been formed at the 

 bottom of the sea, by successive eruptions of a submarine vol- 

 cano. 



