PLATE 3 



Upper: Lower part of a section on Eighteen Mile Creek where the Conodont 

 bed is best developed. 



A, West River shale 



B, Genundewa limestone 



C, Conodont bed 



D, Genesee shale 



(See text-fig. 2) 



Loiver: Section at same level as the above but a few hundred feet away, showing 

 absence of the Conodont bed. (This is an enlarged view of the lower part of 

 section shown in Plate 2, immediately to the left of the camera box seen in that 

 picture.) 



A, West River shale 



B, Genundewa limestone 

 D, Genesee shale 



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