SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 57. NUMBER 10 



CAMBRIAN 



GEOLOGY AND PALEONTOLOGY 



II 



No. lU.-GROUP TERMS FOR THE LOWER AND UPPER 

 CAMBRIAN SERIES OF FORMATIONS 



BY 

 CHARLES D. WALCOTT 



Publication 2137) 



CITY OF WASHINGTON 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION 

 SEPTEMBER 16, 1912 



