Subsurface Laboratory Methods 



161 



FOLDS 

 (May be shown in color where 

 structure is unusually 

 complex) 



Anticline 



(Showing trace of axial plane and 



bearing and plunge of axis. 



Dashed where approximately located) 



If crest line of the 

 fold is mapped rather 

 than the trace of the 

 axial plane, the wording 

 should be "showing crest 

 line." 



Solid, dashed and 

 dotted as on 

 anticline 



^ ■■ 



Concealed anticline 



Doubtful or probable anticline 

 (Dotted where concealed) 



7-V- 



Syncline 



(Showing trace of axial plane and 



bearing and plunge of axis) 



If position of trough is 

 mapped rather than trace 

 of axial plauie, the word- 

 ing should be "showing 

 position of trough." 



Overturned anticline 



(Showing trace of axial plane, direction of dip 



of limbs, and bearing and plunge of a}Ss) 



Overturned syncline 

 (Showing trace of axial plane 

 and direction of dip of limbs) 



Plunge of minor anticline 



Plunge of minor syncline 



Plunge of fold axes 



Plunge measured in 

 vertical plane 



To be used where beds 

 are too tightly folded 

 to show individual folds 

 separately. 



Horizontal fold axes 



