218 



THE VERMILION IRON-BEARING DISTRICT. 



found that the south wall dips at au ang-le of about 70° N. The north wall 

 ranges from a vertical position to a dip of 80° to the north. However, this 

 northerly dip does not continue throughout the trough, but, on the contrary, 

 it is found to be reversed at the east end of the trough, where the walls are 

 overturned in the opposite direction to the walls at the west end, and now 



Fig. 10. — Vertical east-west section through the Chandler mine. 



dip at a high angle — about 80° — to the south. It is not known exactly 

 at what point in the trough this change takes place. It probably occurs 

 about the center of the trough, near the east side of the Pioneer property. 

 This reverse of dip is possibly caused by the occurrence of a small subor- 

 dinate cross anticline, which has produced a warping in the strata, with an 



