H. H. Read — The Two Magmas of StratJibogie. 365 



crystals. The position of such pyroxenite masses as are associated 

 with epidiorites, etc., seems in 110 case due to gravitative 

 differentiation. These pyroxenites by tlieir alteration produce 



hm&r?*-:-:*-, 



Sketch-map, showing distribution of Older and Younger Igneous Eocks in 

 Strathbogie and Lower Banffshire. 



