GARVH ISLAND. GEOLOGY. 515 



fied rocks, however ancient, in which animals have not 

 existed. In concluding this subject, it is unnecessary to 

 point out the importance of the preceding facts to geolo- 

 gical science, and it is almost superfluous to say, that to 

 account for them by calling this gneiss a transition rock, 

 is merely to substitute a term which leaves the fact and 

 its consequences precisely where they stood before. 



