lO 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 57 



JS c/:S 



3 O^n 



Q. s- CD 



Continental shelf and habitat 

 of pre-Cambrian fauna 



Pacific Coast upland 



Cordilleran Algonkian 

 epicontinental sea 



Dakotan upland 



Superior Algonkian 

 epicontinental seas 



Ontarian upland 



St Lawrence Algonkian 

 epicontinental sea 



Newfoundland Algonkian 

 epicontinental sea 



I Atlantic Coast upland 



Continental shelf and habitat 

 of pre-Cambrian fauna 



Fig. I. 



