Legend 
em Post- Glacial 
= | Leda clay 
Pegmatite 
Anorthosite 
Gabbro 
Pre-Cambrian 
1-2 | 2.0ttawa 8nerss, gabbro ete. 
Peete nl Otrear-ez— Pyrexene BNe/Ss 
Grenville limestone 
a> Gra ph ite ore-body 
o Tongue of abbro pegmatite 
True North 
Geologi cal St urvey, Canada 
Walker Mine, Buckingham Township, Quebec. 
Feet 
. : 500. 400 300 20 0 0 500 1000 
oo 50 ° 250 
