•SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 57, NUMBER 7 



CAMBRIAN 

 GEOLOGY AND PALEONTOLOGY 



No. 7.— CAMBRO-ORDOVICIAN BOUNDARY IN BRITISH 

 COLUMBIA WITH DESCRIPTION OP POSSILS 



With Plate 35 



BY 



CHARLES D. WALCOTT 



L^^iiti£'??: 







(Publication 2075) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



MARCH 8, 1912 



