56 



ILLUSTRATIONS OF THE 



withilancling the fradure and diflocation, of 

 which they afford fo many examples, there are 

 few empty fpaces to be met with among them 

 as far as our obfervation extends. The breach- 

 es and feparations are numerous, and diilindt • 

 but they are, for the mofl part, completely fill, 

 ed up with minerals of a kind quite different 

 from the rock on each lide of them, and re- 

 markable for containing no vefliges of ftratifi- 

 cation. We are thus led to confider the unftra- 

 tified foffils, the fecond of the diviiions into which 

 the whole mineral kingdom, viewed geological- 

 ly, ought to be dillinguifhed. Thefe foffils are 

 immediately conneded with the diflurbance of 

 the flrata, and appear, in many inflances, tQ 



have been the inflriiments of their elevation. 



SEC- 



