| 
Country:
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Canada 
 | 
| 
Province:
 | 
Ontario 
 | 
| 
Locality:
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Thedford, Kings Highway 82, 1 mile E of 
 | 
| 
Layer:
 | 
Widder Shale | 
| 
Lower Boundary:
 | 
mid.--up.varcus Zone             [17,00], 389 million years
 
 | 
| 
Upper Boundary:
 | 
UD1L--UD2A:(frechi Zone base)    [06,10], 374.5 million years
 
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| 
Georeference:
 | 
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