86 



THE FOSSILS 



b 



Fig. 22. Microphotographs of silicified fossils of primitive fungal 

 plants from the Gunflint formation of Ontario, 1600 my old. Shown are 

 portions of mycelium and detached (a) and sessile (b) spores (a x 725, 

 b X 750) (from Tyler and Barghoorn, 1954). 



