PRE-CAMBRIAN LIFE 



51 



recorded in the localities hitherto 

 explored, but of which monu- 

 ments may be found elsewhere. 



We may now, taking some 

 North American localities as our 

 best available guides, inquire as to 

 the nature and contents of the beds 

 next below the Lower Cambrian. 



In Southern New Brunswick, 

 Matthew indicated, several years 

 ago, the occurrence of certain con- 

 glomerates and sandy and slaty 

 beds over the rocks, mostly of 

 igneous origin, constituting a great 

 thickness of beds under the Cam- 

 brian, and known locally as the 

 " Coldbrook " series, which is pro- 

 bably equivalent to the Huronian 

 of Northern and Western Canada, 

 to be noticed later. These beds 

 were at first regarded as an upper 

 member of the Huronian, but sub- 

 sequently it was thought better to 

 unite them with the overlying 

 Cambrian as basal Cambrian. 



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