STRUCTURAL FEATURES OF THE PRE-CAM BRIAN 203 



Pontiac Area 



Mica schist 

 Arkose, greywacke 

 Conglomerate or 



Unconformity 

 Basalt, andesite, rhyolite, tuffs, 

 and intrusives 



Matlagamie Area 



Mica schists 

 Conglomerate 



Uncomformity 

 Basic intrusives 

 Basalts, andesites 

 Basalts, andesites, rhyolites, tuffs 



Lucky Strike Area 



Mica schist 

 Arkose, greywacke 

 Conglomerate 



Unconformity 

 Garnetiferous mica schist 

 Tuffs, basalts, basic intrusives 



Windy Lake Area 



Tuffaceous sediments 



RhyoUte porphyry 



Flows of intermediate composition 



Andesite flows 



Basalt flows 



Mica schist 

 Arkose, greywacke 

 Conglomerate 



Unconformity 

 Mica schist and amphibolite 

 Basalt, andesite, rhyolite tuffs, and 

 intrusives 



Kenoniska Area 



Mica schists 

 Quartzite 

 Arkose 

 Conglomerate 



Unconformity 

 Garnetiferous mica schists 

 Slaty tuffs 

 Andesites 

 Basalt 



Brock Area 



Mica and hornblende schists 



Grits 



Conglomerate 



Unconformity 

 Basalts and schists 



Kaopatina-Nemenjish Area 



Interbedded garnetiferous and non- 

 garnetiferous mica gneisses and 

 hornblende gneisses, with crystal- 

 line limestones 



Non-garnetiferous mica gnesises 



Interbedded mica gneisses and basic 

 tuffaceous sediments 



Basalt flows 



Eau Jaune-Obatogamau Area 



Fragmental rhyolite 

 Andesite tuffs 

 Andesite flows 

 Basalt flows 



Father's Lake Area 



Basic tuffs 

 Andesite flows 

 Porphyritic basalt flows 

 Basalt flows 



Opawika Area 



Rhyolite flows 

 Intermediate lavas 

 Andesite tuffs 

 Andesite flows 



{To he continued} 



