PRIMITIVE PLANTS FROM ONTARIO 



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Fig. 23. Microphotographs of silicificd fossils of primitive plants from 

 the Gunflint formation of Ontario, 1600 my old, strongly magnified, to 

 show minute detail conserved by silicification. Unpublished photographs, 

 courtesy professors Elso S. Barghoorn and S.A.Tyler (a x 1600, 

 b X 1500, c X 1800). 



