73° 



VICTOR ZIEGLER 



must have been nearly vertical and must have been manifest at the 

 edges of the uplift in severely crowding the strata upon each other, 



owing to slipping and 

 sliding on the steeply 

 inclined Archean floor. 

 Under these conditions 

 the most logical planes 

 of slipping would be the 

 bedding planes, and the 

 resulting faults would 

 be strike faults with 

 steep dips. The general 

 dip and strike rela- 

 tionship shows normal 



first rlatjft East of Tunnel House 



Fig. 6. — Detail of first fault shown on 

 Fig. 4. 



easterly dips to be the rule in the 



older formations to the west of 



the fault plane, while the younger 



rocks to the east are characterized 



by overturned westerly dips. A 



consideration of the monoclinal 



fold will show that only a steep 



westward-dipping thrust fault as drawn by the writer can explain 



this relationship. Any eastward-dipping fault with overthrust 



from the east would bring younger horizontal rocks to rest upon 



Fig. 7. — Detail of second fault 

 (eastern one) shown on Fig. 4. 



