Pre-Silurian 



79 



11. Ardrossan Marbles. 



Micaceous Slates. 

 13. Talcose, Chloritic, and Hornblendic 

 Schists. 

 Plutonic 11. Granite. 



NoTE.-^Tne Ferruginous Shales represented in fig. 2 as 

 overlying the "Micaceous Slates," have since been ascertained 

 to be decomposed portions of them. 





