PRIxMITIVE PLANTS FROM ONTARIO 



85 



Fig. 21. Microphotograph of single globose colony of primitive algal 

 plants. Detail of Fig. 20 x 725 (from Tyler and Barghoorn, 1954). 



tion consequently provides us with the most beautifully preserved 

 plant remains, 'Silicified woods', for instance, are known from many 

 localities and various geologic formations, and are often preserved 

 in natural parks. 



Due to this silicification, the early plant life of the Gunflint iron 

 formation has been preserved in an amazing wealth of detail, as can 

 be seen from the photographs of thin sections with extreme mag- 

 nification, taken by Professors Tyler and Barghoorn and reproduced 

 here by their kind permission (Figs, 20-23). 



PRIMITIVE PLANTS FROM ONTARIO 



A preliminary note by Tyler and Barghoorn (1954) so far contains 

 all published data. Much more work has been done, which will be 

 fully reviewed in a forthcoming description (Barghoorn, 1962). 

 Anyone interested in these earliest fossils will have to consult this 

 work for full information, because here only a general review can 

 be given. 



