Plate I 6 



h. G. WlitlofV. \\o\o 

 Specimen of Lower Cambric rock from the top of the south 

 face of the Bald Mountain quarry. The upper view shows the small slip 

 faults producing offsets on the bedding plane that appear as broader light 

 bands in the jihotograph. 



The lower view shows the other side of the same slab; it is so illumi- 

 nated that the numerous small ripples parallel with the fault planes arc 

 seen. They result from the shoving of the specimen in the overthrusting 

 along a plane oblique to the bedding plane which forms the surface of tlie 

 slab. I'oth views reduced one-lifth. 



