Ag. 
Legend 
Z : Post-Glacial 
os s ies Leda Clay 
Diabase Dyke 
True North 
Apatite-bearing vein 
Peridotite 
Granite-pegmatite 
and binary granite 
Pre-Cambrian 
Gabbro and diorite 
Ottawa gneiss 
quartz-rich charnockite. etc. 
Grenville limestone 
Geological Survey, Canada. 
Emerald Mine, Buckingham Township,Quebec 
Feet 
100 9 = 400 = 800 1200 
Metres 
100 
a 
190 Q 200 300 
