Front view of the Silurian limestone pit at Mt Joli, showing a 

 horizontal displacement of the beds, definitely bounded by undis- 

 turbed upper and lower surfaces. At X the vertical layer is not 

 displaced but the fault that starts there and travels across the sec- 

 tion shows actual displacement. This displacement is terminated 

 by the layer which is shown at the left of the plate ; unfortunately 

 not fully shown in this photograph. 



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