90< 



22 c 





O£0 c 



iCJl 



-0 C 



* 



-90° 



Figure 25-8. Orientation of unoriented core. 



which is the normal to the bedding plane in its true attitude. True dip is, there- 

 fore, 62 degrees on azimuth 313 degrees. 



Orientation of Unoriented Core (5) 



Unoriented cores present a special problem (McClellan, 1948) . It is nec- 

 essary to estimate the strike of the beds, and unfortunately there are often two 

 possible values of true dip. Selection of the right one will depend on general 

 knowledge of the area. Nevertheless the procedure often gives information of 

 real value. In one instance, where a well was deflected at angles up to 80 de- 

 grees from vertical for a distance of more than a mile, most of the determinations 



540 



