76 RELICS OF PRIMEVAL LIF^ 



SUCCESSION OF PRE-CAMBRIAN ROCKS IN 



CANADA, AS UNDERSTOOD UP TO 1896. 



(/« descending order ^ 



Etcheminian in New Brunswick, Kewenian or Upper 

 Copper-bearing Series of Lake Superior, Signal Hill 

 Series of Newfoundland. C/iuar, and Gra?id Cafion 

 rocks of Colorado, etc. 



Red and greenish Sandstones and Shales, Con- 

 glomerates, Igneous Outflows and Ash-rocks. Bivalve 

 Crustacea, Mollusks, Worms, Sponges, Cystideans, 

 Zoophytes, Protozoa, Cryptozoon. 



( Unconformity^ 



HURONIAN, including Hastings of Ontario, Coldbrook 

 and Coastal of New Brunswick, Algonkian (in part). 

 Conglomerates, Hard Sandstones, Shales and Schists, 

 Iron Ores, Coarse Limestones, Igneous Outflows, and 

 Ash-rocks. Worms, Sponges, Zoophytes, and Proto- 

 zoa (Cryptozoon or Eozoon). 



o 



N 



< 



{Unconformity [.?]) 



Grenvillian or Upper Laurentian. 



Gneiss, Hornblendic and Micaceous Schists, Lime- 

 stones, Quartzite, Iron Ores, Graphite. Eozoon, Archas- 

 ozoon, Archaeospherinae, Archasophyton. 



Unconformity. 



Archaean or Lower Laurentian. 



Gneiss, Hornblende Schists, with many igneous or 

 igneo-aqueous intrusions. 



