328 



Subsurface Geologic Methods 



H 

 UJ 

 LlI 



a. 

 lij 

 Q 



2500 



2600 



2700 



2800 



2900 



3000 



3100 



3200 



3300 



3400 



Figure 134. Section of a fluorolog, showing manner in which fluorescence intensity 

 of core sample or the like is plotted against depth at which sample was ob- 

 tained. 



