PYROXENITES OF THE GRENVILLE SERIES 



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followed the bedding of the quartzite, but in places it has broken 

 across it and has involved considerable portions of the quartzite 

 within itself. The rocks strike south 40° east and are cut by joints 



Fig. I. — Syenite Gneiss from dikes cutting the pyroxenite at High Rock mine, 

 Ottawa county, Canada, (i) Shows the coarse-grained phase of the Syenite, (2), (3), 

 and (4) represent the Leopard Rock phases, and (5) the gneissic phase. 



having a general direction of north 70° west. As shown at the upper 

 left corner of the cut, the jointing is more pronounced in places along 

 the contact with the pyroxenite. Both rocks are cut by small dikes 



